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 * ** * *FirstServlet *com.bjsxt.servlet.FirstServlet ** * */@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..."); }}FirstServlet */first *
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 * * */@SpringBootApplicationpublic 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 ** *FirstFilter *com.bjsxt.filter.FirstFilter ** *///@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 }}FirstFilter */first *
编写启动类
/** *SpringBoot整合Filter 方式一 * */@SpringBootApplication@ServletComponentScanpublic 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 * * */@SpringBootApplicationpublic 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 * ** */@WebListenerpublic 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......"); }}com.bjsxt.listener.FirstListener *
编写启动器
/** * springBoot整合Listener方式一 * * */@SpringBootApplication@ServletComponentScanpublic 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 * * */@SpringBootApplicationpublic class App6 { public static void main(String[] args) { SpringApplication.run(App6.class, args); } /** * 注册listener */ @Bean public ServletListenerRegistrationBean getServletListenerRegistrationBean(){ ServletListenerRegistrationBean bean= new ServletListenerRegistrationBean (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 fileUpload(MultipartFile filename)throws Exception{ System.out.println(filename.getOriginalFilename()); filename.transferTo(new File("d:/"+filename.getOriginalFilename())); Map map = new HashMap<>(); map.put("msg", "ok"); return map; }}
2.编写启动器类
/** * SpringBoot文件上传 * * */@SpringBootApplicationpublic 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=200MBspring.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。