SpringMVC学习
20230712；
1.
<dependencies> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-web</artifactId> <version>5.1.5.RELEASE</version> </dependency> <dependency> <groupId>javax.servlet</groupId> <artifactId>servlet-api</artifactId> <version>2.3</version> </dependency> <dependency> <groupId>javax.servlet</groupId> <artifactId>jsp-api</artifactId> <version>2.0</version> </dependency> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>4.12</version> <scope>test</scope> </dependency> </dependencies>
2.
public class HelloServlet extends HttpServlet { @Override protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { String method = req.getParameter("method"); if (method.equals("add")) { req.getSession().setAttribute("msg", "执行了add方法"); } else if ("delete".equals(method)) { req.getSession().setAttribute("msg", "执行了delete方法"); } req.getRequestDispatcher("/WEB-INF/jsp/test.jsp").forward(req, resp); } @Override protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { this.doGet(req, resp); } }
3.
<?xml version="1.0" encoding="UTF-8"?> <web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd" version="4.0"> <servlet> <servlet-name>hello</servlet-name> <servlet-class>com.kuang.servlet.HelloServlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>hello</servlet-name> <url-pattern>/hello</url-pattern> </servlet-mapping> <!--<session-config> <session-timeout>15</session-timeout> </session-config>--> <!--<welcome-file-list> <welcome-file>welcome.jsp</welcome-file> </welcome-file-list>--> </web-app>
4.
<%@ page contentType="text/html;charset=UTF-8" language="java" %> <html> <head> <title>Title</title> </head> <body> ${msg} </body> </html>
5.
<%-- Created by IntelliJ IDEA. User: lenovo Date: 2023/7/12 Time: 23:53 To change this template use File | Settings | File Templates. --%> <%@ page contentType="text/html;charset=UTF-8" language="java" %> <html> <head> <title>Title</title> </head> <body> <h1>welcome to SpringMVC!</h1> </body> </html>
6.
<%@ page contentType="text/html;charset=UTF-8" language="java" %> <html> <head> <title>Title</title> </head> <body> <form action="/hello" method="post"> <input type="text" name="method"/> <input type="submit"/> </form> </body> </html>
20230713；
1.
<dependencies> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-webmvc</artifactId> <version>5.2.0.RELEASE</version> </dependency> </dependencies>
2.
<?xml version="1.0" encoding="UTF-8"?> <web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd" version="4.0"> <servlet> <servlet-name>springmvc</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <init-param> <param-name>contextConfigLocation</param-name> <param-value>classpath:springmvc-servlet.xml</param-value> </init-param> </servlet> <servlet-mapping> <servlet-name>springmvc</servlet-name> <url-pattern>/</url-pattern> </servlet-mapping> </web-app>
3.
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd"> <bean class="org.springframework.web.servlet.handler.BeanNameUrlHandlerMapping"/> <bean class="org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter"/> <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver" id="internalResourceViewResolver"> <property name="prefix" value="/WEB-INF/jsp/"/> <property name="suffix" value=".jsp"/> </bean> <bean id="/hello" class="com.kuang.controller.HelloController"/> </beans>
4.
public class HelloController implements Controller { @Override public ModelAndView handleRequest(HttpServletRequest request, HttpServletResponse response) throws Exception { ModelAndView mv = new ModelAndView(); mv.addObject("msg", "HelloSpringMVC!"); mv.setViewName("hello"); return mv; } }
5.
<%@ page contentType="text/html;charset=UTF-8" language="java" %> <html> <head> <title>Title</title> </head> <body> ${msg} </body> </html>
20230714；
1.
<?xml version="1.0" encoding="UTF-8"?> <web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd" version="4.0"> <servlet> <servlet-name>springmvcTwo</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <init-param> <param-name>contextConfigLocation</param-name> <param-value>classpath:spring-servlet-two.xml</param-value> </init-param> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>springmvcTwo</servlet-name> <url-pattern>/</url-pattern> </servlet-mapping> </web-app>
2.
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd"> <bean class="org.springframework.web.servlet.handler.BeanNameUrlHandlerMapping"/> <bean class="org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter"/> <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver" id="internalResourceViewResolver"> <property name="prefix" value="/WEB-INF/jsp/"/> <property name="suffix" value=".jsp"/> </bean> <bean id="/hello" class="com.kuang.controllertwo.HelloMvcController"/> </beans>
3.
public class HelloMvcController implements Controller { @Override public ModelAndView handleRequest(HttpServletRequest request, HttpServletResponse response) throws Exception { ModelAndView mv = new ModelAndView(); String str = "HelloSpringMVCTwo!"; mv.addObject("msg", str); mv.setViewName("test"); return mv; } }
4.
<%@ page contentType="text/html;charset=UTF-8" language="java" %> <html> <head> <title>Title</title> </head> <body> ${msg} </body> </html>
20230715；
1.
<?xml version="1.0" encoding="UTF-8"?> <web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd" version="4.0"> <servlet> <servlet-name>springmvc</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <init-param> <param-name>contextConfigLocation</param-name> <param-value>classpath:springmvc-servlet-annotation.xml</param-value> </init-param> </servlet> <servlet-mapping> <servlet-name>springmvc</servlet-name> <url-pattern>/</url-pattern> </servlet-mapping> </web-app>
2.
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context" xmlns:mvc="http://www.springframework.org/schema/mvc" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd"> <context:component-scan base-package="com.kuang.controller"/> <mvc:default-servlet-handler/> <mvc:annotation-driven/> <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver" id="internalResourceViewResolver"> <property name="prefix" value="/WEB-INF/jsp/"/> <property name="suffix" value=".jsp"/> </bean> </beans>
3.
@Controller @RequestMapping("/hello") public class HelloController { @RequestMapping("/h1") public String hello1(Model model) { model.addAttribute("msg", "Hello,SpringMVC by Annotation one!"); return "hello1"; } @RequestMapping("/h2") public String hello2(Model model) { model.addAttribute("msg", "Hello,SpringMVC by Annotaion two!"); return "hello1"; } }
4.
<%@ page contentType="text/html;charset=UTF-8" language="java" %> <html> <head> <title>Title</title> </head> <body> ${msg} </body> </html>
20230716；
1.
<?xml version="1.0" encoding="UTF-8"?> <web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd" version="4.0"> <servlet> <servlet-name>springmvc</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <init-param> <param-name>contextConfigLocation</param-name> <param-value>classpath:springmvc-servlet.xml</param-value> </init-param> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>springmvc</servlet-name> <url-pattern>/</url-pattern> </servlet-mapping> </web-app>
2.
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd"> <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver" id="internalResourceViewResolver"> <property name="prefix" value="/WEB-INF/jsp/"/> <property name="suffix" value=".jsp"/> </bean> <bean id="/helloByImplementsController" class="com.kuang.controller.HelloControllerByImplementsController"/> </beans>
3.
public class HelloControllerByImplementsController implements Controller { @Override public ModelAndView handleRequest(HttpServletRequest request, HttpServletResponse response) throws Exception { ModelAndView mv = new ModelAndView(); mv.addObject("msg", "Hello Controller By Implements Controller!"); mv.setViewName("test"); return mv; } }
4.
<%@ page contentType="text/html;charset=UTF-8" language="java" %> <html> <head> <title>Title</title> </head> <body> ${msg} </body> </html>
5.
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context" xmlns:mvc="http://www.springframework.org/schema/mvc" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd"> <context:component-scan base-package="com.kuang.controller"/> <mvc:default-servlet-handler/> <mvc:annotation-driven/> <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver" id="internalResourceViewResolver"> <property name="prefix" value="/WEB-INF/jsp/"/> <property name="suffix" value=".jsp"/> </bean> <!-- <bean id="/helloByImplementsController" class="com.kuang.controller.HelloControllerByImplementsController"/>--> </beans>
6.
@Controller
@RequestMapping("/helloByAnnotation")
public class HelloControllerByAnnotation {
@RequestMapping("/methodByAnno")
public String methodByAnnotation(Model model) {
model.addAttribute("msg", "Hello By Annotation20230716!");
return "test";
}
}
20230717；
1.
@Controller public class TestRESTfulApiController { // http://localhost:8080/ordiReq?a=1&b=2 @RequestMapping("/ordiReq") public String ordinaryRequest(int a, int b, Model model) { model.addAttribute("msg", a + b); return "test"; } // http://localhost:8080/ordiReq2?a=2&b="abcde" // http://localhost:8080/ordiReq2?a=2&b="pingfan" @RequestMapping("/ordiReq2") public String ordinaryRequest2(int a, String b, Model model) { model.addAttribute("msg", a + b); return "test"; } // http://localhost:8080/testRESTful/1/'dasfadsf' @RequestMapping("/testRESTful/{a}/{b}") public String testRESTful(@PathVariable(name = "a") int a, @PathVariable(name = "b") String b, Model model) { model.addAttribute("msg", a + b); return "test"; } // http://localhost:8080/rest2/1/'dasfadsf' @RequestMapping(value = "/rest2/{a}/{b}", method = RequestMethod.GET) public String testRESTful2(@PathVariable int a, @PathVariable String b, Model model) { model.addAttribute("msg", a + b); return "test"; } // http://localhost:8080/rest3/1/'dasfadsf' @GetMapping("/rest3/{a}/{b}") public String testRESTful3(@PathVariable int a, @PathVariable String b, Model model) { model.addAttribute("msg", a + b); return "test"; } }
20230718；
1.
// 20230718练习 @RequestMapping("/rest4/{a}/{b}") public String rest4(@PathVariable int a, @PathVariable String b, Model model) { model.addAttribute("msg", a + b); return "test"; } // http://localhost:8080/rest5/22/'dasf' // 或 http://localhost:8080/rest5/22/dasf @RequestMapping(path = "rest5/{a}/{b}", method = RequestMethod.GET) public String rest5(@PathVariable int a, @PathVariable String b, Model model) { model.addAttribute("msg", "rest5" + a + b); return "test"; } // <form action="/rest5/22/adafa" method="post"> // 浏览器url也展示为http://localhost:8080/rest5/22/dasf @RequestMapping(value = "rest5/{a}/{b}", method = RequestMethod.POST) public String rest6(@PathVariable int a, @PathVariable String b, Model model) { model.addAttribute("msg", "rest6" + a + b); return "test"; }
2.
<%@ page contentType="text/html;charset=UTF-8" language="java" %> <html> <head> <title>Title</title> </head> <body> <form action="/rest5/22/dasf" method="post"> <input type="submit"/> </form> </body> </html>
3.
<beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context" xmlns:mvc="http://www.springframework.org/schema/mvc" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd"> <context:component-scan base-package="com.kuang.controller"/> <!-- <mvc:default-servlet-handler/>--> <!-- <mvc:annotation-driven/>--> <!-- <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver" id="internalResourceViewResolver">--> <!-- <property name="prefix" value="/WEB-INF/jsp/"/>--> <!-- <property name="suffix" value=".jsp"/>--> <!-- </bean>--> <!-- <bean id="/helloByImplementsController" class="com.kuang.controller.HelloControllerByImplementsController"/>--> </beans>
4.
@Controller public class TestBaseServletForwarAndRedirectWithoutViewResolver { @RequestMapping("/testBaseServletForwardAndRedirectWithoutViewResolver") public String testBaseServletForwardAndRedirectWithoutViewResolver(HttpServletRequest request, HttpServletResponse response) { HttpSession session = request.getSession(); System.out.println(session.getId()); // return "/WEB-INF/jsp/test.jsp"; // return "forward:/WEB-INF/jsp/test.jsp"; return "redirect:/index.jsp"; } }
5.
@Controller public class TestForwardAndRedirectBySpringMvcWithoutViewResolver { @RequestMapping("testForwardAndRedirectBySpringMvcWithoutViewResolver") public String testForwardAndRedirectBySpringMvcWithoutViewResolver(Model model) { model.addAttribute("msg", "testForwardAndRedirectBySpringMvcWithoutViewResolver"); // return "/WEB-INF/jsp/test.jsp"; // return "forward:/WEB-INF/jsp/test.jsp"; return "redirect:/index.jsp"; } }
6.
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context" xmlns:mvc="http://www.springframework.org/schema/mvc" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd"> <context:component-scan base-package="com.kuang.controller"/> <!-- <mvc:default-servlet-handler/>--> <!-- <mvc:annotation-driven/>--> <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver" id="internalResourceViewResolver"> <property name="prefix" value="/WEB-INF/jsp/"/> <property name="suffix" value=".jsp"/> </bean> <!-- <bean id="/helloByImplementsController" class="com.kuang.controller.HelloControllerByImplementsController"/>--> </beans>
7.
@Controller public class TestForwardAndRedirectByViewResolver { @RequestMapping("/testForwardByViewResolver") public String testForwardByViewResolver(Model model) { model.addAttribute("msg", "testForwardByViewResolver"); // 错误事例： // return "/WEB-INF/jsp/test.jsp"; // 正确事例： return "test"; } @RequestMapping("/testRedirectByViewResolver") public String testRedirectByViewResolver(Model model) { model.addAttribute("msg", "testRedirectByViewResolver"); return "redirect:/index.jsp"; } }
20230719；
1.
@Controller @RequestMapping("/receive") public class TestReceivingRequestParametersController { // http://localhost:8080/receive/notRecommended?name=zhangsan @RequestMapping("/notRecommended") public String receiveByNoRequestParamAnnoWhichIsNotRecommended( String name, Model model) { model.addAttribute("msg", name); return "test"; } // http://localhost:8080/receive/recommentedWhenNotObject?username=zhangsan @RequestMapping("/recommentedWhenNotObject") public String receiveByRecommendedUsingRequestParamAnnoWhenNotObject( @RequestParam("username") String name, Model model) { model.addAttribute("msg", name); return "test"; } // http://localhost:8080/receive/receiveObjectNotRecommended?id=1&name=zhangsan&age=28 @RequestMapping("/receiveObjectNotRecommended") public String receiveObjectNotRecommended( @RequestParam("id") int id, @RequestParam("name") String name, @RequestParam("age") int age, Model model) { User user = new User(id, name, age); model.addAttribute("msg", user); return "test"; } // http://localhost:8080/receive/receiveObjectRecomended?id=1&name=zhangsan&age=28 @RequestMapping("/receiveObjectRecomended") public String receiveObjectRecomended(User user, Model model) { model.addAttribute("msg", user); return "test"; } }
20230720；
1.
<%@ page contentType="text/html;charset=UTF-8" language="java" %> <html> <head> <title>Title</title> </head> <body> <form action="/encodingBySpringMvcFilter2" method="post"> <input type="text" name="name"/> <input type="submit"/> </form> </body> </html>
2.
public class EncodingFilter implements Filter { @Override public void init(FilterConfig filterConfig) throws ServletException { } @Override public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException { System.out.println("=========enter custom filter========="); servletRequest.setCharacterEncoding("utf-8"); servletRequest.setCharacterEncoding("utf-8"); filterChain.doFilter(servletRequest, servletResponse); } @Override public void destroy() { } }
3.
<?xml version="1.0" encoding="UTF-8"?> <web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd" version="4.0"> <servlet> <servlet-name>springmvc</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <init-param> <param-name>contextConfigLocation</param-name> <param-value>classpath:springmvc-servlet.xml</param-value> </init-param> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>springmvc</servlet-name> <url-pattern>/</url-pattern> </servlet-mapping> <!-- <filter>--> <!-- <filter-name>encodingByCustomFilter</filter-name>--> <!-- <filter-class>com.kuang.filter.EncodingFilter</filter-class>--> <!-- </filter>--> <!-- <filter-mapping>--> <!-- <filter-name>encodingByCustomFilter</filter-name>--> <!-- <url-pattern>/*</url-pattern>--> <!-- </filter-mapping>--> <filter> <filter-name>encodingBySpringMvc</filter-name> <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class> <init-param> <param-name>encoding</param-name> <param-value>utf-8</param-value> </init-param> </filter> <filter-mapping> <filter-name>encodingBySpringMvc</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> </web-app>
4.
@Controller public class EncodingController { /** * 乱码 * <form action="/encoding/basicTest" method="post"> * <input type="text" name="name"/> * <input type="submit"/> * </form> * @param name * @param model * @return */ @PostMapping("/basicTest") public String basicTest(@RequestParam("name") String name, Model model) { System.out.println(name); model.addAttribute("msg", name); return "test"; } /** * 仍乱码 * <form action="/basicTestByRequestError" method="post"> * <input type="text" name="name"/> * <input type="submit"/> * </form> * @param name * @param model * @param request * @return * @throws UnsupportedEncodingException */ @PostMapping("/basicTestByRequestError") public String basicTestByRequestError(@RequestParam("name") String name, Model model, HttpServletRequest request) throws UnsupportedEncodingException { request.setCharacterEncoding("utf-8"); System.out.println(name); model.addAttribute("msg", name); return "test"; } /** * 乱码 * <filter> * <filter-name>encodingByCustomFilter</filter-name> * <filter-class>com.kuang.filter.EncodingFilter</filter-class> * </filter> * <filter-mapping> * <filter-name>encodingByCustomFilter</filter-name> * <url-pattern>/</url-pattern> * </filter-mapping> */ @PostMapping("/encodingByCustomFilter") public String encodingByCustomFilter(@RequestParam("name") String name, Model model) { System.out.println(name); model.addAttribute("msg", name); return "test"; } /** * 不乱码 * <filter> * <filter-name>encodingByCustomFilter</filter-name> * <filter-class>com.kuang.filter.EncodingFilter</filter-class> * </filter> * <filter-mapping> * <filter-name>encodingByCustomFilter</filter-name> * <url-pattern>/*</url-pattern> * </filter-mapping> */ @PostMapping("/encodingByCustomFilter2") public String encodingByCustomFilter2(@RequestParam("name") String name, Model model) { System.out.println(name); model.addAttribute("msg", name); return "test"; } /** * 乱码 * <filter> * <filter-name>encodingBySpringMvc</filter-name> * <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class> * <init-param> * <param-name>encoding</param-name> * <param-value>utf-8</param-value> * </init-param> * </filter> * <filter-mapping> * <filter-name>encodingBySpringMvc</filter-name> * <url-pattern>/*</url-pattern> * </filter-mapping> * @param name * @param model * @return */ @PostMapping("/encodingBySpringMvcFilter") public String encodingBySpringMvcFilter(@RequestParam("name") String name, Model model) { System.out.println(name); model.addAttribute("msg", name); return "test"; } /** * 可以解决乱码 * <filter> * <filter-name>encodingBySpringMvc</filter-name> * <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class> * <init-param> * <param-name>encoding</param-name> * <param-value>utf-8</param-value> * </init-param> * </filter> * <filter-mapping> * <filter-name>encodingBySpringMvc</filter-name> * <url-pattern>/*</url-pattern> * </filter-mapping> * @param name * @param model * @return */ @PostMapping("/encodingBySpringMvcFilter2") public String encodingBySpringMvcFilter2(@RequestParam("name") String name, Model model) { System.out.println(name); model.addAttribute("msg", name); return "test"; } }
20230721；
1.parse /pɑːs/ 解析；
2.
<%@ page contentType="text/html;charset=UTF-8" language="java" %> <html> <head> <title>Title</title> </head> <body> <script type="text/javascript"> var user = { name : "zhangsan", age : 27, sex : "男" }; var json = JSON.stringify(user); console.log(json); var obj = JSON.parse(json); console.log(obj); console.log(user); </script> </body> </html>
20230722；
1.
<dependencies> <!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-databind --> <dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-databind</artifactId> <version>2.15.2</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-webmvc</artifactId> <version>5.2.0.RELEASE</version> </dependency> <dependency> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> <version>1.18.8</version> </dependency> </dependencies>
2.
<?xml version="1.0" encoding="UTF-8"?> <web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd" version="4.0"> <servlet> <servlet-name>springmvc</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <init-param> <param-name>contextConfigLocation</param-name> <param-value>classpath:springmvc-servlet.xml</param-value> </init-param> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>springmvc</servlet-name> <url-pattern>/</url-pattern> </servlet-mapping> </web-app>
3.
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd"> <context:component-scan base-package="com.kuang.user.controller"/> <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver" id="internalResourceViewResolver"> <property name="prefix" value="/WEB-INF/jsp/"/> <property name="suffix" value=".jsp"/> </bean> </beans>
4.
@Data @AllArgsConstructor @NoArgsConstructor public class User { private String name; private int age; private String sex; }
5.
@Controller public class UserController { @RequestMapping("/testBasicToString") @ResponseBody public String testBasicToString() { User user = new User("秦疆1号", 3, "男"); return user.toString(); } @RequestMapping("/testBasicJackson") @ResponseBody public String testBasicJackson() throws JsonProcessingException { ObjectMapper mapper = new ObjectMapper(); User user = new User("秦疆2号", 22, "男"); String s = mapper.writeValueAsString(user); return s; } }
20230723；
1.
@RequestMapping(value = "testSolveEncodingProblemByProduces", produces = "text/json;charset=utf-8") @ResponseBody private String testSolveEncodingProblemByProduces() throws JsonProcessingException { ObjectMapper mapper = new ObjectMapper(); User user = new User("wangwu", 30, "男"); return mapper.writeValueAsString(user); }
20230724；
1.
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context" xmlns:mvc="http://www.springframework.org/schema/mvc" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd"> <context:component-scan base-package="com.kuang.user.controller"/> <!--SpringMVC处理jackson的JSON乱码问题--> <mvc:annotation-driven> <mvc:message-converters register-defaults="true"> <bean class="org.springframework.http.converter.StringHttpMessageConverter"> <constructor-arg value="UTF-8"/> </bean> <bean class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter"> <property name="objectMapper"> <bean class="org.springframework.http.converter.json.Jackson2ObjectMapperFactoryBean"> <property name="failOnEmptyBeans" value="false"/> </bean> </property> </bean> </mvc:message-converters> </mvc:annotation-driven> <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver" id="internalResourceViewResolver"> <property name="prefix" value="/WEB-INF/jsp/"/> <property name="suffix" value=".jsp"/> </bean> </beans>
2.
@RequestMapping("testSolveEncodingProblemByConfig")
@ResponseBody
public String testSolveEncodingProblemByConfig() throws JsonProcessingException {
ObjectMapper mapper = new ObjectMapper();
User user = new User("木头六", 40, "男");
return mapper.writeValueAsString(user);
}
@RequestMapping("/testReturnArray")
@ResponseBody
public String testReturnArray() throws JsonProcessingException {
ObjectMapper mapper = new ObjectMapper();
User user1 = new User("张三", 20, "男");
User user2 = new User("李四", 21, "女");
User user3 = new User("王五", 22, "男");
ArrayList<User> users = new ArrayList<>();
users.add(user1);
users.add(user2);
users.add(user3);
return mapper.writeValueAsString(users);
}
20230725；
1.
@RequestMapping("/testDateToJsonByJavaSdf")
@ResponseBody
public String testDateToJsonByJavaSdf() throws JsonProcessingException {
// ObjectMapper mapper = new ObjectMapper();
// SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
// Date date = new Date();
// return mapper.writeValueAsString(sdf.format(date));
// return JackSonUtil.getJson(new Date(), "yyyy-MM-dd HH:mm:ss");
return JackSonUtil.getJson(new Date());
}
@RequestMapping("/testDateToJsonByObjectMapperSdf")
@ResponseBody
public String testDateToJsonByObjectMapperSdf() throws JsonProcessingException {
// ObjectMapper mapper = new ObjectMapper();
// mapper.configure(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS, false);
// SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
// mapper.setDateFormat(sdf);
// return mapper.writeValueAsString(new Date());
// return JackSonUtil.getJson(new Date(), "yyyy-MM-dd HH:mm:ss");
return JackSonUtil.getJson(new Date());
}
2.
public class JackSonUtil { public static String getJson(Object object) { return getJson(object, "yyyy-MM-dd HH:mm:ss"); } public static String getJson(Object object, String dateFormat) { ObjectMapper mapper = new ObjectMapper(); mapper.configure(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS, false); SimpleDateFormat sdf = new SimpleDateFormat(dateFormat); mapper.setDateFormat(sdf); try { return mapper.writeValueAsString(object); } catch (JsonProcessingException e) { e.printStackTrace(); } return null; } }
20230726；
1.
<dependency> <groupId>com.alibaba</groupId> <artifactId>fastjson</artifactId> <version>1.2.83</version> </dependency>
2.
@RequestMapping("/testFastjson")
@ResponseBody
public String testFastjson() {
ArrayList<User> users = new ArrayList<>();
User u1 = new User("张三", 28, "男");
User u2 = new User("李四", 20, "男");
User u3 = new User("王五", 23, "女");
users.add(u1);
users.add(u2);
users.add(u3);
String s = JSONObject.toJSONString(users);
return s;
}
20230729；
1.
<?xml version="1.0" encoding="UTF-8"?> <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>org.example</groupId> <artifactId>ssmbuild</artifactId> <version>1.0-SNAPSHOT</version> <properties> <maven.compiler.source>8</maven.compiler.source> <maven.compiler.target>8</maven.compiler.target> </properties> <dependencies> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>4.12</version> <scope>test</scope> </dependency> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>5.1.37</version> </dependency> <!-- https://mvnrepository.com/artifact/com.mchange/c3p0 --> <dependency> <groupId>com.mchange</groupId> <artifactId>c3p0</artifactId> <version>0.9.5.2</version> </dependency> <dependency> <groupId>javax.servlet</groupId> <artifactId>servlet-api</artifactId> <version>2.3</version> </dependency> <dependency> <groupId>javax.servlet</groupId> <artifactId>jsp-api</artifactId> <version>2.0</version> </dependency> <dependency> <groupId>javax.servlet</groupId> <artifactId>jstl</artifactId> <version>1.0</version> </dependency> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis</artifactId> <version>3.5.1</version> </dependency> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis-spring</artifactId> <version>2.0.1</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-webmvc</artifactId> <version>5.2.0.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-jdbc</artifactId> <version>5.3.26</version> </dependency> <dependency> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> <version>1.18.8</version> </dependency> </dependencies> </project>
2.
@Data public class Book { private int bookId; private String bookName; private int bookCount; private String detail; }
3.
public interface BookMapper { public int addBook(Book book); public int deleteBookById(@Param("bookId") int id); public int updateBook(Book book); public Book queryBookById(@Param("bookId") int id); public List<Book> queryAllBook(); }
4.
<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd"> <mapper> <insert id="addUser" parameterType="Book"> insert into BOOK (bookName, bookCount, detail) values (#{bookName}, #{bookCount}, #{detail}); </insert> <delete id="deleteBookById" parameterType="int"> delete from BOOK where bookId = #{bookId}; </delete> <update id="updateBook" parameterType="Book"> update BOOK set bookName = #{bookName}, bookCount = #{bookCount}, detail = #{detail} where bookId = #{bookId}; </update> <select id="queryBookById" parameterType="int" resultType="Book"> select * from BOOK where bookId = #{bookId}; </select> <select id="queryAllBook" resultType="Book"> select * from BOOK; </select> </mapper>
5.
public interface BookService { public int addBook(Book book); public int deleteBookById(int id); public int updateBook(Book book); public Book queryBookById(int id); public List<Book> queryAllBook(); }
6.
public class BookServiceImpl implements BookService { private BookMapper bookMapper; public void setBookMapper(BookMapper bookMapper) { this.bookMapper = bookMapper; } @Override public int addBook(Book book) { return bookMapper.addBook(book); } @Override public int deleteBookById(int id) { return bookMapper.deleteBookById(id); } @Override public int updateBook(Book book) { return bookMapper.updateBook(book); } @Override public Book queryBookById(int id) { return bookMapper.queryBookById(id); } @Override public List<Book> queryAllBook() { return bookMapper.queryAllBook(); } }
7.
<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-config.dtd"> <configuration> <typeAliases> <package name="com.kuang.pojo"/> </typeAliases> <mappers> <mapper class="com.kuang.mapper"/> </mappers> </configuration>
20230730；
1.
jdbc.driver=com.mysql.jdbc.Driver jdbc.url=jdbc:mysql://localhost:3306/ssmbuild jdbc.username=root jdbc.password=root
2.
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd"> <context:property-placeholder location="classpath:database.properties"/> <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"> <property name="driverClass" value="${jdbc.driver}"/> <property name="jdbcUrl" value="${jdbc.url}"/> <property name="user" value="${jdbc.username}"/> <property name="password" value="${jdbc.password}"/> </bean> </beans>
20230801；
1.
<!-- https://mvnrepository.com/artifact/org.springframework/spring-webmvc --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-webmvc</artifactId> <version>6.0.9</version> </dependency> <!-- https://mvnrepository.com/artifact/org.springframework/spring-jdbc --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-jdbc</artifactId> <version>6.0.9</version> </dependency>
2.
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd"> <context:property-placeholder location="classpath:database.properties"/> <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"> <property name="driverClass" value="${jdbc.driver}"/> <property name="jdbcUrl" value="${jdbc.url}"/> <property name="user" value="${jdbc.username}"/> <property name="password" value="${jdbc.password}"/> </bean> <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"> <property name="dataSource" ref="dataSource"/> <property name="configLocation" value="classpath:mybatis-config.xml"/> </bean> <bean id="mapperScannerConfigurer" class="org.mybatis.spring.mapper.MapperScannerConfigurer"> <property name="basePackage" value="com.kuang.mapper"/> <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/> </bean> </beans>
3.
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd"> <context:component-scan base-package="com.kuang.service"/> <bean id="bookService" class="com.kuang.service.impl.BookServiceImpl"> <property name="bookMapper" ref="bookMapper"/> </bean> <bean id="dataSourceTransactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager"> <property name="dataSource" ref="dataSource"/> </bean> </beans>
20230803；
1.
<?xml version="1.0" encoding="UTF-8"?> <web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd" version="4.0"> <servlet> <servlet-name>springmvc</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <init-param> <param-name>contextConfigLocation</param-name> <param-value>classpath:spring-mvc.xml</param-value> </init-param> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>springmvc</servlet-name> <url-pattern>/</url-pattern> </servlet-mapping> <filter> <filter-name>encodingFilter</filter-name> <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class> <init-param> <param-name>encoding</param-name> <param-value>utf-8</param-value> </init-param> </filter> <filter-mapping> <filter-name>encodingFilter</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> <session-config> <session-timeout>15</session-timeout> </session-config> </web-app>
2.
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:context="http://www.springframework.org/schema/context" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd"> <mvc:annotation-driven/> <mvc:default-servlet-handler/> <context:component-scan base-package="com.kuang.controller"/> <bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <property name="prefix" value="/WEB-INF/jsp/"/> <property name="suffix" value=".jsp"/> </bean> </beans>
3.
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd"> <import resource="spring-dao.xml"/> <import resource="spring-service.xml"/> <import resource="spring-mvc.xml"/> </beans>
20230905；
1.decoration /ˌdek.əˈreɪ.ʃən/ 装饰
text-decoration
20230907，
1.解决idea service控制台中文乱码：https://blog.csdn.net/qq_40406929/article/details/122957674
2.tomcat启动失败：
2.1如果Tomcat启动不成功，是没有lib的原因
解决办法：项目结构-artifacts，然后 把你的WEB-INF目录展开，如果没有lib包就单击一下WEB-INF目录，然后点那个文件夹带个+的图标，新建lib文件夹，选中lib文件夹，点击+下面带个小三角那个图标，选第一个Library Files，全选添加，然后Apply-ok就行了。重启Tomcat就能成功了
2.2启动Tomcat报错：org.apache.jasper.JasperException: java.lang.ClassNotFoundException: org.apache.jsp.index_jsp：
这是因为在lib中加了jsp-api.jar和servlet-api.jar，与Tomcat中的冲突，所以删掉项目lib中的这两个包就行了，因为Tomcat中已经存在了。
2.3启动有问题，正在解决。
20230912，
1.Tomcat启动各种报错，解决方案：project stucture里保证artifacts里lib下不爆红
2.仍报错，重装Tomcat后仍报错，修改catalina.properties解决问题
# tomcat.util.scan.DefaultJarScanner.jarsToSkip=\
# 改为如下
tomcat.util.scan.DefaultJarScanner.jarsToSkip=\,*
Tomcat启动成功。
20230912，
1.spring-mvc.xml里，视图解析器 InternalResourceViewResolver 将控制器返回的逻辑视图名转化为视图资源，
例如将allBook转化为/WEB-INF/jsp/allBook.jsp
所以如果allBook.jsp建在WEB-INF/jsp路径下，在spring-mvx.xml里，配置前缀时一定不能漏了最后的/，即/WEB-INF/jsp/
@Controller @RequestMapping("/book") public class BookController { @Autowired @Qualifier("bookServiceImpl") private BookService bookService; @RequestMapping("/allBook") public String allBook(Model model) { List<Book> list = bookService.queryAllBook(); model.addAttribute("list", list); return "allBook"; } }
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:context="http://www.springframework.org/schema/context" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd"> <mvc:annotation-driven/> <mvc:default-servlet-handler/> <context:component-scan base-package="com.kuang.controller"/> <bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <property name="prefix" value="/WEB-INF/jsp/"/> <property name="suffix" value=".jsp"/> </bean> </beans>
20230913，
1.margin 给元素设置外边距，分别是上 右 下 左。
2.border-radius/ˈreɪ.di.əs/ 设置元素的圆角外边框
3.启动报错 无法在web.xml或使用此应用程序部署的jar文件中解析绝对uri：[http://java.sun.com/jsp/jstl/core]
https://www.cnblogs.com/dzwj/p/17438483.html
https://blog.csdn.net/qq_61570366/article/details/132767031
https://developer.aliyun.com/article/922935
即解决方案：
pom导入standard依赖，解压standard.jar将tld复制到WEB/INF，web.xml里配置JSTL，project sturcture菜单里artifacts重新部署
4.pom.xml里
<!-- https://mvnrepository.com/artifact/taglibs/standard --> <dependency> <groupId>taglibs</groupId> <artifactId>standard</artifactId> <version>1.1.2</version> </dependency>
5.web.xml里
<jsp-config> <taglib> <taglib-uri>http://java.sun.com/jstl/fmt</taglib-uri> <taglib-location>/WEB-INF/fmt.tld</taglib-location> </taglib> <taglib> <taglib-uri>http://java.sun.com/jstl/core</taglib-uri> <taglib-location>/WEB-INF/c.tld</taglib-location> </taglib> </jsp-config>
6.index.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %> <html> <head> <title>首页</title> <style> a{ text-decoration: none; color: black; font-size: 18px; } h3{ width: 180px; height: 38px; margin: 100px auto; text-align: center; line-height: 38px; background: deepskyblue; border-radius: 5px; } </style> </head> <body> <h3> <a href="${pageContext.request.contextPath}/book/allBook">进入书籍页面</a> </h3> </body> </html>
7.allBook.jsp
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %> <%@ page contentType="text/html;charset=UTF-8" language="java" %> <html> <head> <title>Title</title> <link href="https://cdn.staticfile.org/twitter-bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet"> </head> <body> <div class="container"> <div class="row clearfix"> <div class="col-md-12 column"> <div class="page-header"> <h1>书籍展示 ———— 书籍列表</h1> </div> </div> </div> <div class="row clearfix"> <div class="col-md-12 column"> <table class="table table-hover table-striped"> <thead> <tr> <th>书籍编号</th> <th>书籍名称</th> <th>书籍数量</th> <th>书籍详情</th> </tr> </thead> <tbody> <c:forEach var="book" items="${list}"> <tr> <td>${book.bookId}</td> <td>${book.bookName}</td> <td>${book.bookCount}</td> <td>${book.detail}</td> </tr> </c:forEach> </tbody> </table> </div> </div> </div> </body> </html>
20231008，
1.allBook.jsp
<div class="row"> <div class="col-md-3 column"> <p><a class="btn btn-primary btn-lg" href="${pageContext.request.contextPath}/book/goAddPage" role="button">新增书籍</a></p> </div> </div>
2.BookController.java
@RequestMapping("/goAddPage")
public String goAddPage(Model model) {
return "addBook";
}
@RequestMapping("/addBook")
public String addBook(Book book) {
System.out.println(book);
bookService.addBook(book);
return "redirect:/book/allBook";
}
3.addBook.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %> <html> <head> <title>Title</title> <link href="https://cdn.staticfile.org/twitter-bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet"> </head> <body> <div class="container"> <div class="row clearfix"> <div class="col-md-12 column"> <div class="page-header"> <h1>新增书籍</h1> </div> </div> <div class="row"> <form class="form-signin" action="${pageContext.request.contextPath}/book/addBook" method="post"> <label for="bookName">书籍名称</label> <input type="text" id="bookName" name="bookName" value="${book.bookName}" class="form-control" placeholder="书籍名称" required autofocus> <label for="bookCount">书籍数量</label> <input type="text" id="bookCount" name="bookCount" value="${book.bookCount}" class="form-control" placeholder="书籍数量" required> <label for="detail">书籍详情</label> <input type="text" id = "detail" name="detail" value="${book.detail}" class="form-control" placeholder="书籍详情" required> <button class="btn btn-lg btn-primary btn-block" type="submit">保存</button> </form> </div> </div> </div> </body> </html>
4.BookMapper.xml
<insert id="addBook" parameterType="Book"> insert into BOOK (bookName, bookCount, detail) values (#{bookName}, #{bookCount}, #{detail}); </insert>
20231009，
1.BookController.java
@RequestMapping("/goUpdatePage")
public String goUpdatePage(int id, Model model) {
Book book = bookService.queryBookById(id);
model.addAttribute("book", book);
return "updateBook";
}
@RequestMapping("/updateBook")
public String updateBook(Book book) {
System.out.println("BookController.updateBook=>" + book);
int updateResult = bookService.updateBook(book);
if (updateResult > 0) {
List<Book> list = bookService.queryAllBook();
System.out.println("BookController.updateBook 更新成功");
System.out.println(list);
}
return "redirect:/book/allBook";
}
@RequestMapping("/deleteBook/{bookId}")
public String deleteBook(@PathVariable("bookId") int id) {
bookService.deleteBookById(id);
return "redirect:/book/allBook";
}
2.updateBook.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %> <html> <head> <title>Title</title> <link href="https://cdn.staticfile.org/twitter-bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet"> </head> <body> <div class="container"> <div class="row clearfix"> <div class="col-md-12 column"> <div class="page-header"> <h1>修改书籍</h1> </div> </div> <div class="row"> <form class="form-signin" action="${pageContext.request.contextPath}/book/updateBook" method="post"> <input type="hidden" name="bookId" value="${book.bookId}"> <label for="bookName">书籍名称</label> <input type="text" id="bookName" name="bookName" value="${book.bookName}" class="form-control" placeholder="书籍名称" required autofocus> <label for="bookCount">书籍数量</label> <input type="text" id="bookCount" name="bookCount" value="${book.bookCount}" class="form-control" placeholder="书籍数量" required> <label for="detail">书籍详情</label> <input type="text" id = "detail" name="detail" value="${book.detail}" class="form-control" placeholder="书籍详情" required> <button class="btn btn-lg btn-primary btn-block" type="submit">修改</button> </form> </div> </div> </div> </body> </html>
3.mybatis-config.xml
<settings> <setting name="logImpl" value="STDOUT_LOGGING"/> </settings>
4.spring-service.xml
<tx:advice id="txAdvice" transaction-manager="dataSourceTransactionManager"> <tx:attributes> <tx:method name="add" propagation="REQUIRED"/> <tx:method name="delete" propagation="REQUIRED"/> <tx:method name="update" propagation="REQUIRED"/> <tx:method name="query" read-only="true"/> <tx:method name="*" propagation="REQUIRED"/> </tx:attributes> </tx:advice> <aop:config> <aop:pointcut id="myPointcut" expression="execution(* com.kuang.mapper.*.*(..))"></aop:pointcut> <aop:advisor advice-ref="txAdvice" pointcut-ref="myPointcut"></aop:advisor> </aop:config>
5.allBook.jsp
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %> <%@ page contentType="text/html;charset=UTF-8" language="java" %> <html> <head> <title>Title</title> <link href="https://cdn.staticfile.org/twitter-bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet"> </head> <body> <div class="container"> <div class="row clearfix"> <div class="col-md-12 column"> <div class="page-header"> <h1>书籍展示 ———— 书籍列表</h1> </div> </div> <div class="row"> <div class="col-md-3 column"> <p><a class="btn btn-primary btn-lg" href="${pageContext.request.contextPath}/book/goAddPage" role="button">新增书籍</a></p> </div> </div> </div> <div class="row clearfix"> <div class="col-md-12 column"> <table class="table table-hover table-striped"> <thead> <tr> <th>书籍编号</th> <th>书籍名称</th> <th>书籍数量</th> <th>书籍详情</th> <th>操作</th> </tr> </thead> <tbody> <c:forEach var="book" items="${list}"> <tr> <td>${book.bookId}</td> <td>${book.bookName}</td> <td>${book.bookCount}</td> <td>${book.detail}</td> <td> <a href="${pageContext.request.contextPath}/book/goUpdatePage?id=${book.bookId}">修改</a> | <a href="${pageContext.request.contextPath}/book/deleteBook/${book.bookId}">删除</a> </td> </tr> </c:forEach> </tbody> </table> </div> </div> </div> </body> </html>
20231010，
1.BookController.java
@RequestMapping("/queryBookByName")
public String queryBookByName(String queryBookName, Model model) {
Book book = bookService.queryBookByName(queryBookName);
List<Book> list = new ArrayList<>();
if (book != null) {
list.add(book);
} else {
model.addAttribute("errorMsg", "未查询到书籍");
list = bookService.queryAllBook();
}
model.addAttribute("list", list);
return "allBook";
}
@RequestMapping("/queryAllBook")
public String queryAllBook(Model model) {
List<Book> list = bookService.queryAllBook();
model.addAttribute("list", list);
return "allBook";
}
2.BookServiceImpl.java
@Override public Book queryBookByName(String queryBookName) { return bookMapper.queryBookByName(queryBookName); }
3.BookService.java
public Book queryBookByName(String queryBookName);
4.BookMapper.java
public Book queryBookByName(@Param("bookName") String queryBookName);
5.BookMapper.xml
<select id="queryBookByName" resultType="Book"> select * from BOOK where bookName = #{bookName}; </select>
6.allBook.jsp
<div class="row"> <div class="col-md-4 column"> <a class="btn btn-primary" href="${pageContext.request.contextPath}/book/goAddPage" role="button">新增书籍</a> <a class="btn btn-primary" href="${pageContext.request.contextPath}/book/queryAllBook">查询所有书籍</a> </div> <div class="col-md-8 column"> <form class="form-inline" style="float: right" action="${pageContext.request.contextPath}/book/queryBookByName" method="post"> <span style="color: red;font-weight: bold">${errorMsg}</span> <input type="text" name="queryBookName" placeholder="请输入书籍名称" class="form-control" /> <input type="submit" value="查询" class="form-control" /> </form> </div> </div>
7.狂神ssm-demo项目效果：
20231012，
1.web.xml
<servlet> <servlet-name>DispatcherServlet</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <init-param> <param-name>contextConfigLocation</param-name> <param-value>classpath:applicationContext.xml</param-value> </init-param> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>DispatcherServlet</servlet-name> <url-pattern>/</url-pattern> </servlet-mapping> <filter> <filter-name>encoding</filter-name> <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class> <init-param> <param-name>encoding</param-name> <param-value>utf-8</param-value> </init-param> </filter> <filter-mapping> <filter-name>encoding</filter-name> <url-pattern>/*</url-pattern> </filter-mapping>
2.applicationContext.xml
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context" xmlns:mvc="http://www.springframework.org/schema/mvc" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd"> <context:component-scan base-package="com.kuang.Controller"/> <mvc:annotation-driven/> <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver" id="internalResourceViewResolver"> <property name="prefix" value="/WEB-INF/jsp"/> <property name="suffix" value=".jsp"/> </bean> </beans>
3.AjaxController.java
@RestController public class AjaxController { @RequestMapping("/a1") public void a1(String name, HttpServletResponse httpServletResponse) throws IOException { System.out.println("a1:name=>" + name); String result = "kuangshen".equals(name) ? "true" : "false"; httpServletResponse.getWriter().println(result); } }
4.效果
20231013，
1.imitateAjax.html
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>模拟Ajax效果</title> <script> function getInputUrlRefreshIFrame() { document.getElementById("myIFrame").src = document.getElementById("urlInput").value; } function changeInputUrlShowVueWebsite() { document.getElementById("urlInput").value = 'https://cn.vuejs.org'; document.getElementById("myIFrame").src = document.getElementById("urlInput").value; } </script> <style> .url-input { width: 500px; } .my-iframe { width: 500px; height: 400px; } .go-input-button { width: 235px; } .go-vue-button { width: 293px; } </style> </head> <body> <input class="url-input" type="text" style="" id="urlInput" value="https://cn.vuejs.org/api/composition-api-setup.html#basic-usage"/> <br> <br> <div> 点击在iframe中加载input框中的URL <input class="go-input-button" type="button" onclick="getInputUrlRefreshIFrame()" value="showInputUrlInIFrame"/> </div> <br> <div> 点击在iframe中展示Vue官网 <input class="go-vue-button" type="button" onclick="changeInputUrlShowVueWebsite()" value="changeInputUrlShowVueWebsiteInIFrame"/> </div> <br> <div>iframe展示：</div> <iframe class="my-iframe" id="myIFrame" src="https://cn.vuejs.org/api/composition-api-setup.html#basic-usage"/> </body> </html>
2.效果：
3.applicationContext.xml
<mvc:default-servlet-handler/>
4.index.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %> <html> <head> <title>测试Ajax</title> <script src="${pageContext.request.contextPath}/static/js/jquery-3.7.1.js"></script> <script> function testAjax() { $.post({ url: "${pageContext.request.contextPath}/testAjax", dataType: "json", data: { "name": $("#usernameInput").val() }, success: function (data) { alert("success-" + data); }, error: function (data) { alert("error-" + data); console.log(data); } }) } </script> </head> <body> <input id="usernameInput" type="text" value="请输入用户名" onblur="testAjax()"/> <%-- <input type="button" value="提交" onclick="testAjax()"/>--%> </body> </html>
5.AjaxController.java
@RequestMapping("/testAjax")
public boolean testAjax(String name) {
// int i = 5 / 0;
return "kuangshen".equals(name) ? true : false;
}
6.效果：
20231014，
今天练习过程中突然404了暂时未能解决，下一步继续解决。这导致id="testGetDataByAjax"的按钮的点击事件方法未进行测试。
1.AjaxController.java
@RequestMapping("/testAjaxResponseWrite")
public void testAjaxResponseWrite(String name, HttpServletResponse httpServletResponse) throws IOException {
boolean result = "kuangshen".equals(name) ? true : false;
httpServletResponse.getWriter().print(result);
}
/*@RequestMapping("/getUserList")
public List<User> getUserList() {
List<User> users = new ArrayList<>();
users.add(new User("1", "狂神说Java", 3, "男"));
users.add(new User("2", "狂神说Spring", 4, "男"));
users.add(new User("3", "狂神说SpringMVC", 5, "男"));
return users;
}*/
2.User.java
@Data @NoArgsConstructor @AllArgsConstructor public class User { private String id; private String name; private int age; private String sex; }
3.testAjaxGetData.jsp
<%-- Created by IntelliJ IDEA. User: lenovo Date: 2023/10/14 Time: 11:29 To change this template use File | Settings | File Templates. --%> <%@ page contentType="text/html;charset=UTF-8" language="java" %> <html> <head> <title>Title</title> <script src="${pageContext.request.contextPath}/static/js/jquery-3.7.1.js"></script> <script> function testAjaxStatus() { $.post({ url: "${pageContext.request.contextPath}/testAjax", data: { name: $("#username").val() }, success: function(data, status) { console.log("data=>" + data); console.log("status=>" + status); }, error: function(data, status) { console.log("data=>" + data); console.log("status=>" + status); } }) } function testAjaxResponseWrite() { $.post({ url: "${pageContext.request.contextPath}/testAjaxResponseWrite", data: { name: $("#username").val(), }, success: function(data) { console.log("data=>" + data); }, error: function(data) { console.log("data=>" +data); } }); } /*$(function () { $("#testGetDataByAjax").click(function() { /!*$.post("${pageContext.request.contextPath}/getUserList", function (data) { debugger; console.log(data); /!*if (data != null && data != "" && data != undefined) { let userTbody = $("#userTable>tbody"); let userTr = ""; for (let i = 0; i < data.length; i++) { userTr = userTr + "<tr>" + "<td>" + data[i].name + "</td>" + "<td>" + data[i].age + "</td>" + "<td>" + data[i].sex + "</td>"; } userTbody.append(userTr); }*!/ });*!/ $.post({ url: "${pageContext.request.contextPath}/getUserList", data: {}, success: function(data) { if (data != null && data != "" && data != undefined) { let userTbody = $("#userTable>tbody"); let userTr = ""; for (let i = 0; i < data.length; i++) { userTr = userTr + "<tr>" + "<td>" + data[i].name + "</td>" + "<td>" + data[i].age + "</td>" + "<td>" + data[i].sex + "</td>"; } userTbody.append(userTr); } } }); }); })*/ </script> </head> <body> <input type="text" id="username"/> <input type="button" onclick="testAjaxStatus()" value="测试Ajax返回status"/> <input type="button" onclick="testAjaxResponseWrite()" value="测试HttpServletResponse返回"/> <input type="button" id="testGetDataByAjax" value="testGetDataByAjax"/> <table id="userTable"> <tr> <td>姓名</td> <td>年龄</td> <td>性别</td> </tr> </table> </body> </html>
20231015，
1.LearnAjaxController.java
@RequestMapping("/getUserList2")
public List<User> getUserList2() {
List<User> users = new ArrayList<>();
users.add(new User("1", "狂神说Java", 3, "男"));
users.add(new User("2", "狂神说Spring", 4, "男"));
users.add(new User("3", "狂神说SpringMVC", 5, "男"));
return users;
}
2.Solve404Controller.java
@RequestMapping("/solve404")
public class Solve404Controller {
@RequestMapping("/goTest2Page")
public String goTest2Page() {
return "testAjaxGetData";
}
}
3.applicationContext.xml
<context:component-scan base-package="com.learnajax.controller"/>
4.testAjaxGetData.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %> <html> <head> <title>Title</title> <script src="${pageContext.request.contextPath}/static/js/jquery-3.7.1.js"></script> <script> $(function () { $("#testGetDataByAjax").click(function() { $.post({ url: "${pageContext.request.contextPath}/getUserList2", success: function(data) { if (data != null && data != "" && data != undefined) { let userTbody = $("#userTable>tbody"); let userTr = ""; for (let i = 0; i < data.length; i++) { userTr = userTr + "<tr>" + "<td>" + data[i].name + "</td>" + "<td>" + data[i].age + "</td>" + "<td>" + data[i].sex + "</td>" + "</tr>"; } console.log(userTr); userTbody.append(userTr); } } }); }); $("#testGetDataByAjax3").click(function() { $.post("${pageContext.request.contextPath}/getUserList2", function (data) { console.log(data); if (data != null && data != "" && data != undefined) { let userTbody = $("#userTable>tbody"); let userTr = ""; for (let i = 0; i < data.length; i++) { userTr = userTr + "<tr>" + "<td>" + data[i].name + "</td>" + "<td>" + data[i].age + "</td>" + "<td>" + data[i].sex + "</td>"; } console.log(userTr); userTbody.append(userTr); }; }); }); }) </script> </head> <body> <input type="button" id="testGetDataByAjax" value="testGetDataByAjax"/> <br> <input type="button" id="testGetDataByAjax3" value="testGetDataByAjax3"/> <table id="userTable"> <tr> <td>姓名</td> <td>年龄</td> <td>性别</td> </tr> </table> </body> </html>
5.效果：
20231017，
1.LearnAjaxController.java
@RequestMapping("/checkUserNamePassword")
public String checkUserNamePassword(String userName, String password) {
if (userName != null && !userName.isEmpty()) {
return "admin".equals(userName) ? "ok" : "用户名有误";
} else if (password != null && !password.isEmpty()) {
return "123456".equals(password) ? "ok" : "密码有误";
}
return "";
}
2.login.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %> <html> <head> <title>Title</title> <script src="${pageContext.request.contextPath}/static/js/jquery-3.7.1.js"></script> <script> function checkUserName() { $.post({ url: "${pageContext.request.contextPath}/checkUserNamePassword", data: { "userName": $("#userName").val() }, success: function (data) { if (data!=""&&data!=null&&data!=undefined&&"ok"===data.toString()) { $("#userInfo").css("color", "green"); } else { $("#userInfo").css("color", "red"); } $("#userInfo").html(data.toString()); } }) } function checkPwd() { $.post({ url: "${pageContext.request.contextPath}/checkUserNamePassword", data: { "password": $("#password").val() }, success: function (data) { if (data!=""&&data!=null&&data!=undefined&&"ok"===data.toString()) { $("#pwdInfo").css("color", "green"); } else { $("#pwdInfo").css("color", "red"); } $("#pwdInfo").html(data.toString()); } }) } </script> </head> <body> <p> 用户名：<input type="text" id="userName" value="请输入用户名" onblur="checkUserName()"/> <!-- span不支持自闭合 --> <span id="userInfo"></span> </p> <p> 密码：<input type="password" id="password" value="请输入密码" onblur="checkPwd()"/> <!-- span不支持自闭合 --> <span id="pwdInfo"></span> </p> </body> </html>
3.applicationContext.xml
<!--SpringMVC处理jackson的JSON乱码问题--> <mvc:annotation-driven> <mvc:message-converters register-defaults="true"> <bean class="org.springframework.http.converter.StringHttpMessageConverter"> <constructor-arg value="UTF-8"/> </bean> <bean class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter"> <property name="objectMapper"> <bean class="org.springframework.http.converter.json.Jackson2ObjectMapperFactoryBean"> <property name="failOnEmptyBeans" value="false"/> </bean> </property> </bean> </mvc:message-converters> </mvc:annotation-driven>
4.效果：
20231018，
1.TestInterceptorController.java
@RestController public class TestInterceptorController { @GetMapping("/t2") public String t2() { System.out.println("=======kong:execute t2 method======="); return "ok"; } }
2.MyInterceptor.java
public class MyInterceptor implements HandlerInterceptor { @Override public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception { System.out.println("=======kong:before execute======"); return true; } @Override public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception { System.out.println("=======kong:after execute======"); } @Override public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception { System.out.println("=======kong:clean======"); } }
3.applicationContext.xml
<mvc:interceptors> <mvc:interceptor> <mvc:mapping path="/**"/> <bean class="com.kuang.config.MyInterceptor"></bean> </mvc:interceptor> </mvc:interceptors>
4.效果：
控制台：
拦截器只保留 preHandler时：
若preHandle返回false，则t2方法不会被执行：
20231022，
1.请求转发和请求重定向
如下摘自 https://zhuanlan.zhihu.com/p/604721025
请求转发（Forward）：发生在服务端程序内部，当服务器端收到一个客户端的请求之后，会先将请求，转发给目标地址，再将目标地址返回的结果转发给客户端。而客户端对于这一切毫无感知的，这就好比，张三（客户端）找李四（服务器端）借钱，而李四没钱，于是李四又去王五那借钱，并把钱借给了张三，整个过程中张三只借了一次款，剩下的事情都是李四完成的，这就是请求转发。
请求重定向（Redirect）：请求重定向指的是服务器端接收到客户端的请求之后，会给客户端返回了一个临时响应头，这个临时响应头中记录了，客户端需要再次发送请求（重定向）的 URL 地址，客户端再收到了地址之后，会将请求发送到新的地址上，这就是请求重定向。这就好像张三（客户端）找李四（服务器端）借钱，李四没钱，于是李四就告诉张三，“我没钱，你去王五那借“，于是张三又去王五家借到了钱，这就是请求重定向。
20231023，
1.LoginController.java
@Controller @RequestMapping("/user") public class LoginController { @RequestMapping("/goMain") public String goMain() { return "main"; } @RequestMapping("/goLogin") public String goLogin() { return "login"; } @RequestMapping("/login") public String login(HttpSession session, String userName, String password, Model model) { if (userName != null && !userName.isEmpty() && password != null && !password.isEmpty() && "tom".equals(userName) && "666".equals(password)) { session.setAttribute("userLoginInfo", userName); model.addAttribute("userName", userName); return "main"; } return "login"; } @RequestMapping("/logout") public String logout(HttpSession session) { session.removeAttribute("userLoginInfo"); return "login"; } }
2.LoginInterceptor.java
public class LoginInterceptor implements HandlerInterceptor { @Override public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception { if (request.getRequestURL().indexOf("goLogin") != -1 || request.getRequestURL().indexOf("login") != -1) { return true; } HttpSession session = request.getSession(); if (session.getAttribute("userLoginInfo") != null) { String userLoginInfo = (String) session.getAttribute("userLoginInfo"); if (!userLoginInfo.isEmpty()) { return true; } } request.getRequestDispatcher("/WEB-INF/jsp/login.jsp").forward(request, response); return false; } }
3.applicationContext.xml
<mvc:interceptors> <mvc:interceptor> <mvc:mapping path="/**"/> <bean class="com.kuang.config.MyInterceptor"></bean> </mvc:interceptor> <mvc:interceptor> <mvc:mapping path="/user/**"/> <bean class="com.kuang.config.LoginInterceptor"></bean> </mvc:interceptor> </mvc:interceptors>
4.index.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %> <html> <head> <title>$Title$</title> </head> <body> <p> <a href="${pageContext.request.contextPath}/user/goMain">首页</a> </p> <p> <a href="${pageContext.request.contextPath}/user/goLogin">登录页</a> </p> </body> </html>
5.login.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %> <html> <head> <title>Title</title> </head> <body> <h1>登录页</h1> <form action="${pageContext.request.contextPath}/user/login" method="post"> 用户名：<input type="text" name="userName"/> 密码：<input type="password" name="password"/> <input type="submit" value="登录"/> </form> </body> </html>
6.main.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %> <html> <head> <title>Title</title> </head> <body> <h1>主页</h1> <span>${userName}</span> <p> <a href="${pageContext.request.contextPath}/user/logout">注销</a> </p> </body> </html>
7.效果：
默认index.jsp
点击“首页”，LoginInterceptor判断session中没有登录信息，请求转发到登录页：
用户登录成功后跳转到首页：
点击“注销”，清除session中的登录信息，跳转到登录页。
20231103，
1.pom.xml
<dependency> <groupId>commons-fileupload</groupId> <artifactId>commons-fileupload</artifactId> <version>1.3.3</version> </dependency> <dependency> <groupId>javax.servlet</groupId> <artifactId>javax.servlet-api</artifactId> <version>4.0.1</version> </dependency>
2.applicationContext.xml
<bean class="org.springframework.web.multipart.commons.CommonsMultipartResolver" id="multipartResolver"> <property name="defaultEncoding" value="utf-8"/> <!-- 10M --> <property name="maxUploadSize" value="10485760"/> <!-- 40K --> <property name="maxInMemorySize" value="40960"/> </bean>
3.FileController.java
@Controller public class FileController { @RequestMapping("/upload") public String upload(@RequestParam("file")CommonsMultipartFile file, HttpServletRequest request) throws IOException { String filename = file.getOriginalFilename(); if (filename == null || filename.isEmpty()) { return "redirect:/index.jsp"; } String path = request.getServletContext().getRealPath("upload"); if (path!=null && !path.isEmpty()) { File realPath = new File(path); if (!realPath.exists()) { realPath.mkdir(); } InputStream in = file.getInputStream(); FileOutputStream out = new FileOutputStream(new File(realPath + File.separator + filename)); int len = 0; byte[] buffer = new byte[1024]; while((len = in.read(buffer)) != -1) { out.write(buffer, 0, len); out.flush(); } out.close(); in.close(); return "redirect:/index.jsp"; } return "redirect:/index.jsp"; } @RequestMapping("/uploadByTransferTo") public String uploadByTransferTo(@RequestParam("fileForTransferTo") CommonsMultipartFile file, HttpServletRequest request) throws IOException { String filename = file.getOriginalFilename(); if (filename != null && !filename.isEmpty()) { String path = request.getServletContext().getRealPath("/upload"); if (path != null && !path.isEmpty()) { File realPath = new File(path); if (!realPath.exists()) { realPath.mkdir(); } file.transferTo(new File(realPath, filename)); } } return "redirect:/index.jsp"; } @RequestMapping("download") public String download(HttpServletResponse response, HttpServletRequest request) throws Exception { String path = request.getServletContext().getRealPath("/upload"); if (path != null && !path.isEmpty()) { String filename = "zhangsan.png"; response.reset(); response.setCharacterEncoding("UTF-8"); response.setContentType("multipart/form-data"); response.setHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(filename, "UTF-8")); InputStream in = new FileInputStream(new File(path, filename)); OutputStream out = response.getOutputStream(); int len = 0; byte[] buffer = new byte[1024]; while((len = in.read(buffer)) != -1) { out.write(buffer, 0, len); out.flush(); } out.close(); in.close(); } return null; } }
4.index.jsp
<form action="${pageContext.request.contextPath}/upload" enctype="multipart/form-data" method="post"> <input type="file" name="file"/> <input type="submit" value="upload"/> </form> <form action="${pageContext.request.contextPath}/uploadByTransferTo" enctype="multipart/form-data" method="post"> <input type="file" name="fileForTransferTo"/> <input type="submit" value="uploadByTransferTo"/> </form> <a href="${pageContext.request.contextPath}/download">download</a>
5.效果：
点击第一行“选择文件”，选择zhangsan.png，点击“upload”。点击第二行“选择文件” ，选择lisi.png，点击“uploadByTransferTo”。可以在upload文件夹下看到已成功上传的这两个文件。
点击第三行“download”，可以下载zhangsan.png：
20231104，
