SpringMVC(二)

一、目录结构

二、代码

1、UserController

  1 package cn.bijian.controller;
  2 
  3 import cn.bijian.exception.SysException;
  4 import cn.bijian.model.User;
  5 import org.springframework.stereotype.Controller;
  6 import org.springframework.ui.Model;
  7 import org.springframework.web.bind.annotation.RequestBody;
  8 import org.springframework.web.bind.annotation.RequestMapping;
  9 import org.springframework.web.bind.annotation.ResponseBody;
 10 import org.springframework.web.multipart.MultipartFile;
 11 import org.springframework.web.servlet.ModelAndView;
 12 
 13 import javax.servlet.http.HttpServletRequest;
 14 import javax.servlet.http.HttpServletResponse;
 15 import java.io.File;
 16 import java.io.IOException;
 17 import java.util.ArrayList;
 18 import java.util.List;
 19 import java.util.UUID;
 20 
 21 @Controller
 22 @RequestMapping("/user")
 23 public class UserController {
 24     @RequestMapping("/testString")
 25     public String testString(Model model){
 26         User user = new User();
 27         user.setUsername("aaa");
 28         user.setPassword("123");
 29         user.setAge(18);
 30         model.addAttribute("user",user);
 31         return "success";
 32     }
 33 
 34     @RequestMapping("/testVoid")
 35     public void testVoid(HttpServletRequest request, HttpServletResponse response) throws Exception {
 36         //1、转发
 37         //request.getRequestDispatcher("/WEB-INF/pages/success.jsp").forward(request,response);
 38         //2、重定向
 39         //response.sendRedirect(request.getContextPath()+"/res.jsp");
 40         //3、直接响应数据
 41         response.setCharacterEncoding("utf-8");
 42         response.setContentType("text/html;charset=utf-8");
 43         response.getWriter().print("您好");
 44         return;
 45     }
 46 
 47     @RequestMapping("/testModelAndView")
 48     public ModelAndView testModelAndView(){
 49         ModelAndView mv = new ModelAndView();
 50         mv.setViewName("list");
 51         List<User> users = new ArrayList<>();
 52         User user1 = new User();
 53         user1.setUsername("aaa");
 54         user1.setPassword("123");
 55         user1.setAge(12);
 56         User user2 = new User();
 57         user2.setUsername("bbb");
 58         user2.setPassword("456");
 59         user2.setAge(18);
 60         users.add(user1);
 61         users.add(user2);
 62         mv.addObject("users",users);
 63         return mv;
 64     }
 65 
 66     @RequestMapping("/testForward")
 67     public String testForward(){
 68         System.out.println("testForward");
 69         return "forward:/user/testString";
 70     }
 71 
 72     @RequestMapping("/testRedirect")
 73     public String testRedirect(){
 74         System.out.println("testRedirect");
 75         return "forward:/user/testString";
 76     }
 77 
 78     /*
 79         ResponseBody响应json数据
 80      */
 81     @RequestMapping("/testResponseBody")
 82     public @ResponseBody User testResponseBody(@RequestBody User user){
 83         //将json字符串封装到user对象中
 84         System.out.println(user);
 85         //模拟查询数据库
 86         user.setUsername("bbb");
 87         user.setAge(20);
 88         //响应(@ResponseBody将user转换为json)
 89         return user;
 90     }
 91 
 92     /*
 93         SpringMVC的文件上传
 94      */
 95     @RequestMapping("/fileUpload")
 96     public String testFileUpload(HttpServletRequest request,MultipartFile upload) throws IOException {
 97         //upload必须和<input type="file" name="upload"/>中的name属性一样
 98         System.out.println("SpringMVC的文件上传方式");
 99         //1、上传文件目录
100         String path = request.getSession().getServletContext().getRealPath("/uploads");
101 //        System.out.println(path);
102         //D:\\IdeaProjects\\apache-tomcat-9.0.40\\webapps\\ROOT\\uploads
103         File file = new File(path);
104         if (!file.exists()){
105             file.mkdirs();
106         }
107         //2、获取上传文件名称
108         String filename = upload.getOriginalFilename();
109         String uuid = UUID.randomUUID().toString().replaceAll("-", "").toUpperCase();
110         filename = uuid + "_" + filename;
111         //3、上传文件
112         upload.transferTo(new File(path,filename));
113         return "success";
114     }
115 
116     /*
117         异常处理
118      */
119     @RequestMapping("/testException")
120     public String testException() throws SysException {
121         try {
122             int a = 10/0;
123         } catch (Exception e) {
124             e.printStackTrace();
125             //向上抛出自定义异常
126             throw new SysException("查询出错了");
127         }
128         return "success";
129     }
130 
131     /*
132         拦截器：Spring MVC的处理器拦截器类似于Servlet开发中的过滤器Filter，用于对处理器进行预处理和后处理。
133         1、过滤器是servlet规范中的一部分，任何java web工程都可以使用。拦截器是SpringMVC框架自己的，只有使用了SpringMVC框架的工程才能用。
134         2、过滤器在url-pattern中配置了/*之后，可以对所有要访问的资源拦截。拦截器它是只会拦截访问的控制器方法，如果访问的是jsp，html,css,
135            image或者js是不会进行拦截的。
136      */
137     @RequestMapping("/testInterceptor")
138     public String testInterceptor(){
139         System.out.println("testInterceptor...");
140         return "success";
141     }
142     
143 }

2、SysException

 1 package cn.bijian.exception;
 2 
 3 public class SysException extends Exception{
 4     private String message;
 5 
 6     public SysException(String message) {
 7         this.message = message;
 8     }
 9 
10     @Override
11     public String getMessage() {
12         return message;
13     }
14 
15     public void setMessage(String message) {
16         this.message = message;
17     }
18 }

3、SysExceptionResolver

 1 package cn.bijian.exception;
 2 
 3 import org.springframework.web.servlet.HandlerExceptionResolver;
 4 import org.springframework.web.servlet.ModelAndView;
 5 
 6 import javax.servlet.http.HttpServletRequest;
 7 import javax.servlet.http.HttpServletResponse;
 8 
 9 public class SysExceptionResolver implements HandlerExceptionResolver {
10     @Override
11     public ModelAndView resolveException(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) {
12         SysException e = null;
13         if (ex instanceof SysException){
14             e = (SysException) ex;
15         }else {
16             e = new SysException("请联系管理员");
17         }
18         ModelAndView mv = new ModelAndView();
19         mv.setViewName("error");
20         mv.addObject("message",e.getMessage());
21         return mv;
22     }
23 }

4、MyInterceptor1

 1 package cn.bijian.Interceptor;
 2 
 3 import org.springframework.web.servlet.HandlerInterceptor;
 4 import org.springframework.web.servlet.ModelAndView;
 5 
 6 import javax.servlet.http.HttpServletRequest;
 7 import javax.servlet.http.HttpServletResponse;
 8 
 9 /*
10     自定义拦截器
11  */
12 public class MyInterceptor1 implements HandlerInterceptor {
13     /*
14         预处理，Controller方法执行前。
15      */
16     @Override
17     public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
18         System.out.println("MyInterceptor1方法执行了");
19         System.out.println("preHandle1执行了");
20         return true;
21     }
22     /*
23         Controller方法执行后，JSP视图执行前。
24      */
25     @Override
26     public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
27         System.out.println("postHandle1执行了");
28     }
29     /*
30         JSP视图执行后。
31      */
32     @Override
33     public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
34         System.out.println("afterCompletion1执行了");
35     }
36 }

5、MyInterceptor2

 1 package cn.bijian.Interceptor;
 2 
 3 import org.springframework.web.servlet.HandlerInterceptor;
 4 import org.springframework.web.servlet.ModelAndView;
 5 
 6 import javax.servlet.http.HttpServletRequest;
 7 import javax.servlet.http.HttpServletResponse;
 8 
 9 /*
10     自定义拦截器2
11  */
12 public class MyInterceptor2 implements HandlerInterceptor {
13     /*
14         预处理，Controller方法执行前。
15      */
16     @Override
17     public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
18         System.out.println("MyInterceptor2方法执行了");
19         System.out.println("preHandle2执行了");
20         return true;
21     }
22     /*
23         Controller方法执行后，JSP视图执行前。
24      */
25     @Override
26     public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
27         System.out.println("postHandle2执行了");
28     }
29     /*
30         JSP视图执行后。
31      */
32     @Override
33     public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
34         System.out.println("afterCompletion2执行了");
35     }
36 }

6、User

 1 package cn.bijian.model;
 2 
 3 import java.io.Serializable;
 4 
 5 public class User implements Serializable {
 6     private String username;
 7     private String password;
 8     private Integer age;
 9 
10     public String getUsername() {
11         return username;
12     }
13 
14     public void setUsername(String username) {
15         this.username = username;
16     }
17 
18     public String getPassword() {
19         return password;
20     }
21 
22     public void setPassword(String password) {
23         this.password = password;
24     }
25 
26     public Integer getAge() {
27         return age;
28     }
29 
30     public void setAge(Integer age) {
31         this.age = age;
32     }
33 
34     @Override
35     public String toString() {
36         return "User{" +
37                 "username='" + username + '\'' +
38                 ", password='" + password + '\'' +
39                 ", age=" + age +
40                 '}';
41     }
42 }

7、SpringMVC.xml

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <beans xmlns="http://www.springframework.org/schema/beans"
 3        xmlns:mvc="http://www.springframework.org/schema/mvc"
 4        xmlns:context="http://www.springframework.org/schema/context"
 5        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 6        xsi:schemaLocation="
 7         http://www.springframework.org/schema/beans
 8         http://www.springframework.org/schema/beans/spring-beans.xsd
 9         http://www.springframework.org/schema/mvc
10         http://www.springframework.org/schema/mvc/spring-mvc.xsd
11         http://www.springframework.org/schema/context
12         http://www.springframework.org/schema/context/spring-context.xsd">
13 
14     <context:component-scan base-package="cn.bijian"></context:component-scan>
15     <!--配置视图解析器-->
16     <bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
17         <property name="prefix" value="/WEB-INF/pages/"></property>
18         <property name="suffix" value=".jsp"></property>
19     </bean>
20     <!--前端控制器，哪些静态资源不拦截-->
21     <mvc:resources mapping="/css/**" location="/css/"></mvc:resources>
22     <mvc:resources mapping="/images/**" location="/images/"></mvc:resources>
23     <mvc:resources mapping="/js/**" location="/js/"></mvc:resources>
24     <!--配置spring开启注解MVC的支持-->
25     <mvc:annotation-driven></mvc:annotation-driven>
26     <!--文件解析器，id必须为multipartResolver-->
27     <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
28         <property name="maxUploadSize" value="10485760"></property>
29     </bean>
30     <!--配置异常处理器-->
31     <bean id="sysExceptionResolver" class="cn.bijian.exception.SysExceptionResolver"></bean>
32     <!--配置拦截器-->
33     <mvc:interceptors>
34         <mvc:interceptor>
35             <!--哪些方法拦截-->
36             <mvc:mapping path="/user/*"/>
37             <!--哪些方法不拦截-->
38 <!--            <mvc:exclude-mapping path=""/>-->
39             <!--注册拦截器对象-->
40             <bean id="myInterceptor1" class="cn.bijian.Interceptor.MyInterceptor1"></bean>
41         </mvc:interceptor>
42         <mvc:interceptor>
43             <mvc:mapping path="/**"/>
44             <bean id="myInterceptor2" class="cn.bijian.Interceptor.MyInterceptor2"></bean>
45         </mvc:interceptor>
46     </mvc:interceptors>
47 
48 </beans>

8、web.xml

 1 <!DOCTYPE web-app PUBLIC
 2  "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
 3  "http://java.sun.com/dtd/web-app_2_3.dtd" >
 4 
 5 <web-app>
 6   <display-name>Archetype Created Web Application</display-name>
 7   <!--  配置过滤器-->
 8   <filter>
 9     <filter-name>characterEncodingFilter</filter-name>
10     <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
11     <init-param>
12       <param-name>encoding</param-name>
13       <param-value>utf-8</param-value>
14     </init-param>
15   </filter>
16   <filter-mapping>
17     <filter-name>characterEncodingFilter</filter-name>
18     <url-pattern>/*</url-pattern>
19   </filter-mapping>
20 
21   <!--SpringMVC的核心配置器-->
22   <servlet>
23     <servlet-name>dispatcherServlet</servlet-name>
24     <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
25     <!--配置Servlet的初始化参数，读取springmvc的配置文件，创建Spring容器-->
26     <init-param>
27       <param-name>contextConfigLocation</param-name>
28       <param-value>classpath:SpringMVC.xml</param-value>
29     </init-param>
30     <!--配置servlet启动时加载对象-->
31     <load-on-startup>1</load-on-startup>
32   </servlet>
33   <servlet-mapping>
34     <servlet-name>dispatcherServlet</servlet-name>
35     <url-pattern>/</url-pattern>
36   </servlet-mapping>
37 </web-app>

9、index.jsp

 1 <%@ page contentType="text/html;charset=UTF-8" language="java" isELIgnored="false" %>
 2 <html>
 3 <head>
 4     <title>index</title>
 5     <script src="js/jquery.min.js"></script>
 6     <script>
 7         <%--页面加载--%>
 8         $(function (){
 9             $("#btn").click(function (){
10                 $.ajax({
11                     url:"user/testResponseBody",
12                     contentType:"application/json;charset=utf-8",
13                     data:'{"username":"aa","password":"100","age":18}',
14                     dataType:"json",
15                     type:"post",
16                     success:function (data) {
17                         alert(data);
18                         alert(data.username);
19                         alert(data.password);
20                         alert(data.age);
21                     }
22                 });
23             });
24         });
25     </script>
26 </head>
27 <body>
28 <h2>Hello World!</h2>
29 <a href="/user/testString">testString</a>
30 <h2>Hello World!</h2>
31 <a href="/user/testVoid">testVoid</a>
32 <h2>Hello World!</h2>
33 <a href="/user/testModelAndView">testModelAndView</a>
34 <h2>Hello World!</h2>
35 <a href="/user/testForward">testForward</a>
36 <h2>Hello World!</h2>
37 <a href="/user/testRedirect">testRedirect</a>
38 <h2>Hello World!</h2>
39 
40 <button id="btn">发送AJAX请求</button>
41 
42 <h3>文件上传</h3>
43 <form action="/user/fileUpload" method="post" enctype="multipart/form-data">
44     选择文件：<input type="file" name="upload"/><br/>
45     <input type="submit" value="上传">
46 </form>
47 <h2>Hello World!</h2>
48 <a href="/user/testException">testException</a>
49 <h2>Hello World!</h2>
50 <a href="/user/testInterceptor">testInterceptor</a>
51 </body>
52 </html>

10、error.jsp

 1 <%@ page contentType="text/html;charset=UTF-8" language="java" isELIgnored="false" %>
 2 <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
 3 <html>
 4 <head>
 5     <title>执行失败</title>
 6 </head>
 7 <body>
 8 <h3>执行失败！</h3>
 9 <h2>${message}</h2>
10 </body>
11 </html>

11、list.jsp

 1 <%@ page contentType="text/html;charset=UTF-8" language="java" isELIgnored="false" %>
 2 <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
 3 <html>
 4 <head>
 5     <title>list</title>
 6 </head>
 7 <body>
 8 <h3>查询所有数据</h3>
 9 <c:forEach items="${users}" var="user">
10     ${user.username}
11     ${user.password}
12     ${user.age}
13 </c:forEach>
14 </body>
15 </html>

12、success.jsp

 1 <%@ page contentType="text/html;charset=UTF-8" language="java" isELIgnored="false" %>
 2 <html>
 3 <head>
 4     <title>success</title>
 5 </head>
 6 <body>
 7 <h3>success</h3>
 8 ${user.username}
 9 ${user.password}
10 ${user.age}
11 <h3>success</h3>
12 </body>
13 </html>

13、res.jsp

1 <%@ page contentType="text/html;charset=UTF-8" language="java" %>
2 <html>
3 <body>
4 <h3>res</h3>
5 
6 </body>
7 </html>

14、pom.xml

  1 <?xml version="1.0" encoding="UTF-8"?>
  2 
  3 <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  4   xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  5   <modelVersion>4.0.0</modelVersion>
  6 
  7   <groupId>cn.bijian</groupId>
  8   <artifactId>SpringMVC_review_2</artifactId>
  9   <version>1.0-SNAPSHOT</version>
 10   <packaging>war</packaging>
 11 
 12   <name>SpringMVC_review_2 Maven Webapp</name>
 13   <!-- FIXME change it to the project's website -->
 14   <url>http://www.example.com</url>
 15 
 16   <properties>
 17     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 18     <maven.compiler.source>1.7</maven.compiler.source>
 19     <maven.compiler.target>1.7</maven.compiler.target>
 20   </properties>
 21 
 22   <dependencies>
 23     <dependency>
 24       <groupId>junit</groupId>
 25       <artifactId>junit</artifactId>
 26       <version>4.11</version>
 27       <scope>test</scope>
 28     </dependency>
 29 
 30     <dependency>
 31       <groupId>org.springframework</groupId>
 32       <artifactId>spring-context</artifactId>
 33       <version>5.0.3.RELEASE</version>
 34     </dependency>
 35 
 36     <dependency>
 37       <groupId>org.springframework</groupId>
 38       <artifactId>spring-web</artifactId>
 39       <version>5.0.3.RELEASE</version>
 40     </dependency>
 41 
 42     <dependency>
 43       <groupId>org.springframework</groupId>
 44       <artifactId>spring-webmvc</artifactId>
 45       <version>5.0.4.RELEASE</version>
 46     </dependency>
 47 
 48     <dependency>
 49       <groupId>javax.servlet</groupId>
 50       <artifactId>servlet-api</artifactId>
 51       <version>2.5</version>
 52     </dependency>
 53 
 54     <dependency>
 55       <groupId>javax.servlet</groupId>
 56       <artifactId>jsp-api</artifactId>
 57       <version>2.0</version>
 58     </dependency>
 59 
 60     <dependency>
 61       <groupId>javax.servlet</groupId>
 62       <artifactId>jstl</artifactId>
 63       <version>1.2</version>
 64     </dependency>
 65 
 66     <dependency>
 67       <groupId>com.fasterxml.jackson.core</groupId>
 68       <artifactId>jackson-annotations</artifactId>
 69       <version>2.9.2</version>
 70     </dependency>
 71 
 72     <dependency>
 73       <groupId>com.fasterxml.jackson.core</groupId>
 74       <artifactId>jackson-databind</artifactId>
 75       <version>2.9.2</version>
 76     </dependency>
 77 
 78     <dependency>
 79       <groupId>com.fasterxml.jackson.core</groupId>
 80       <artifactId>jackson-core</artifactId>
 81       <version>2.9.2</version>
 82     </dependency>
 83 
 84     <dependency>
 85       <groupId>commons-io</groupId>
 86       <artifactId>commons-io</artifactId>
 87       <version>2.6</version>
 88     </dependency>
 89 
 90     <dependency>
 91       <groupId>commons-fileupload</groupId>
 92       <artifactId>commons-fileupload</artifactId>
 93       <version>1.3.1</version>
 94     </dependency>
 95   </dependencies>
 96 
 97   <build>
 98     <finalName>SpringMVC_review_2</finalName>
 99     <pluginManagement><!-- lock down plugins versions to avoid using Maven defaults (may be moved to parent pom) -->
100       <plugins>
101         <plugin>
102           <artifactId>maven-clean-plugin</artifactId>
103           <version>3.1.0</version>
104         </plugin>
105         <!-- see http://maven.apache.org/ref/current/maven-core/default-bindings.html#Plugin_bindings_for_war_packaging -->
106         <plugin>
107           <artifactId>maven-resources-plugin</artifactId>
108           <version>3.0.2</version>
109         </plugin>
110         <plugin>
111           <artifactId>maven-compiler-plugin</artifactId>
112           <version>3.8.0</version>
113         </plugin>
114         <plugin>
115           <artifactId>maven-surefire-plugin</artifactId>
116           <version>2.22.1</version>
117         </plugin>
118         <plugin>
119           <artifactId>maven-war-plugin</artifactId>
120           <version>3.2.2</version>
121         </plugin>
122         <plugin>
123           <artifactId>maven-install-plugin</artifactId>
124           <version>2.5.2</version>
125         </plugin>
126         <plugin>
127           <artifactId>maven-deploy-plugin</artifactId>
128           <version>2.8.2</version>
129         </plugin>
130       </plugins>
131     </pluginManagement>
132   </build>
133 </project>

posted on 2021-11-03 10:39 晨曦生辉耀匕尖阅读(39) 评论(0) 编辑收藏举报

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SpringMVC(二)

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