SpringBoot整合JavaWeb
一、SpringBoot整合Servlet的两种方式
1.通过注解扫描完成Servlet组件的注册
编写Servlet
package com.example.demo.servlet; import java.io.IOException; import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; /** *SpringBoot整合Servlet方式一 * *<servlet> * <servlet-name>FirstServlet</servlet-name> * <servlet-class>com.bjsxt.servlet.FirstServlet</servlet-class> *</servlet> * *<servlet-mapping> * <servlet-name>FirstServlet</servlet-name> * <url-pattern>/first</url-pattern> *</servlet-mapping> * */ @WebServlet(name="FirstServlet",urlPatterns="/first") public class FirstServlet extends HttpServlet { /** * */ private static final long serialVersionUID = 8500147337364528371L; @Override protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { super.doGet(req, resp); System.out.println("FirstServlet..."); } }
编写启动器类
package com.example.demo; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.boot.web.servlet.ServletComponentScan; @SpringBootApplication @ServletComponentScan //在springBoot启动时会扫描@WebServlet,并将该类实例化 public class SpringbootWebApplication { public static void main(String[] args) { SpringApplication.run(SpringbootWebApplication.class, args); } }
2.通过方法完成Servlet组件的注册
编写Servlet
package com.example.demo.servlet; import java.io.IOException; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; /** *SpringBoot整合Servlet方式二 * */ public class SecondServlet extends HttpServlet { /** * */ private static final long serialVersionUID = -7076398985231616781L; @Override protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { System.out.println("SecondServlet..."); } }
编写启动器类
package com.example.demo; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.boot.web.servlet.ServletRegistrationBean; import org.springframework.context.annotation.Bean; import com.example.demo.servlet.SecondServlet; /** * SpringBoot整合Servlet方式二 * * */ @SpringBootApplication public class App2 { public static void main(String[] args) { SpringApplication.run(App2.class, args); } @Bean public ServletRegistrationBean getServletRegistrationBean(){ ServletRegistrationBean bean = new ServletRegistrationBean(new SecondServlet()); bean.addUrlMappings("/second"); return bean; } }
二、SpringBoot整合Filter的两种方式
1.通过注解扫描完成Filter组件的注册
编写Filter
/** *SpringBoot整合Filter 方式一 *<filter> * <filter-name>FirstFilter</filter-name> * <filter-class>com.bjsxt.filter.FirstFilter</filter-class> *</filter> *<filter-mapping> * <filter-name>FirstFilter</filter-name> * <url-pattern>/first</url-pattern> *</filter-mapping> */ //@WebFilter(filterName="FirstFilter",urlPatterns={"*.do","*.jsp"}) @WebFilter(filterName="FirstFilter",urlPatterns="/first") public class FirstFilter implements Filter { @Override public void destroy() { // TODO Auto-generated method stub } @Override public void doFilter(ServletRequest arg0, ServletResponse arg1, FilterChain arg2) throws IOException, ServletException { System.out.println("进入Filter"); arg2.doFilter(arg0, arg1); System.out.println("离开Filter"); } @Override public void init(FilterConfig arg0) throws ServletException { // TODO Auto-generated method stub } }
编写启动类
/** *SpringBoot整合Filter 方式一 * */ @SpringBootApplication @ServletComponentScan public class App3 { public static void main(String[] args) { SpringApplication.run(App3.class, args); } }
2.通过方法完成Filter组件的注册
编写Filter
/** * *SpringBoot整合Filter 方式二 * */ public class SecondFilter implements Filter { @Override public void destroy() { // TODO Auto-generated method stub } @Override public void doFilter(ServletRequest arg0, ServletResponse arg1, FilterChain arg2) throws IOException, ServletException { System.out.println("进入SecondFilter"); arg2.doFilter(arg0, arg1); System.out.println("离开SecondFilter"); } @Override public void init(FilterConfig arg0) throws ServletException { // TODO Auto-generated method stub } }
编写启动器类
/** * SpringBoot整合Filter方式二 * * */ @SpringBootApplication public class App4 { public static void main(String[] args) { SpringApplication.run(App4.class, args); }/** * 注册Filter */ @Bean public FilterRegistrationBean getFilterRegistrationBean(){ FilterRegistrationBean bean = new FilterRegistrationBean(new SecondFilter()); //bean.addUrlPatterns(new String[]{"*.do","*.jsp"}); bean.addUrlPatterns("/second"); return bean; } }
三、SpringBoot整合Listener的两种方式
1.通过注解扫描完成Listener的注册
编写Listener
/** * springBoot整合Listener * *<listener> * <listener-class>com.bjsxt.listener.FirstListener</listener-class> *</listener> */ @WebListener public class FirstListener implements ServletContextListener { @Override public void contextDestroyed(ServletContextEvent arg0) { // TODO Auto-generated method stub } @Override public void contextInitialized(ServletContextEvent arg0) { System.out.println("Listener...init......"); } }
编写启动器
/** * springBoot整合Listener方式一 * * */ @SpringBootApplication @ServletComponentScan public class App5 { public static void main(String[] args) { SpringApplication.run(App5.class, args); } }
2. 通过方法完成Listener组件注册
编写Listener
/** * springBoot整合Listener方式二。 * * */ public class SecondListener implements ServletContextListener { @Override public void contextDestroyed(ServletContextEvent arg0) { // TODO Auto-generated method stub } @Override public void contextInitialized(ServletContextEvent arg0) { System.out.println("SecondListener..init....."); } }
编写启动器类
/** * SpringBoot整合Listener方式二 * * */ @SpringBootApplication public class App6 { public static void main(String[] args) { SpringApplication.run(App6.class, args); } /** * 注册listener */ @Bean public ServletListenerRegistrationBean<SecondListener> getServletListenerRegistrationBean(){ ServletListenerRegistrationBean<SecondListener> bean= new ServletListenerRegistrationBean<SecondListener>(new SecondListener()); return bean; } }
四、访问静态资源
1. SpringBoot可在classpath/static的目录下存放静态资源
2. SpringBoot可在ServletContext根目录下存放静态资源
在src/main/webapp 目录名称必须要webapp
五、文件上传
1.编写Controller类
/** * SpringBoot文件上传 * * */ //@Controller @RestController //表示该类下的方法的返回值会自动做json格式的转换 public class FileUploadController { /* * 处理文件上传 */ @RequestMapping("/fileUploadController") public Map<String, Object> fileUpload(MultipartFile filename)throws Exception{ System.out.println(filename.getOriginalFilename()); filename.transferTo(new File("d:/"+filename.getOriginalFilename())); Map<String, Object> map = new HashMap<>(); map.put("msg", "ok"); return map; } }
2.编写启动器类
/** * SpringBoot文件上传 * * */ @SpringBootApplication public class App7 { public static void main(String[] args) { SpringApplication.run(App7.class, args); } }
3.编写application.properties配置文件,设置上传文件大小的默认值
spring.servlet.multipart.max-file-size=200MB
spring.servlet.multipart.max-request-size=200MB
设置单个上传文件的大小:spring.servlet.multipart.max-file-size=200MB
设置一次请求上传文件的总容量:spring.servlet.multipart.max-request-size=200MB
总结
本篇简单介绍了SpringBoot整合Servlet、Filter、Listener、以及SpringBoot上传文件的方式,下一篇将介绍SpringBoot视图层技术。
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