一、SpringBoot整合Servlet的兩種方式
1.通過注解掃描完成Servlet組件的注冊
編寫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..."); } }
編寫啟動器類
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啟動時會掃描@WebServlet，並將該類實例化 public class SpringbootWebApplication { public static void main(String[] args) { SpringApplication.run(SpringbootWebApplication.class, args); } }
2.通過方法完成Servlet組件的注冊
編寫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..."); } }
編寫啟動器類
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的兩種方式
1.通過注解掃描完成Filter組件的注冊
編寫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("進入Filter"); arg2.doFilter(arg0, arg1); System.out.println("離開Filter"); } @Override public void init(FilterConfig arg0) throws ServletException { // TODO Auto-generated method stub } }
編寫啟動類
/** *SpringBoot整合Filter 方式一 * */ @SpringBootApplication @ServletComponentScan public class App3 { public static void main(String[] args) { SpringApplication.run(App3.class, args); } }
2.通過方法完成Filter組件的注冊
編寫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("進入SecondFilter"); arg2.doFilter(arg0, arg1); System.out.println("離開SecondFilter"); } @Override public void init(FilterConfig arg0) throws ServletException { // TODO Auto-generated method stub } }
編寫啟動器類
/** * SpringBoot整合Filter方式二 * * */ @SpringBootApplication public class App4 { public static void main(String[] args) { SpringApplication.run(App4.class, args); }/** * 注冊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的兩種方式
1.通過注解掃描完成Listener的注冊
編寫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......"); } }
編寫啟動器
/** * springBoot整合Listener方式一 * * */ @SpringBootApplication @ServletComponentScan public class App5 { public static void main(String[] args) { SpringApplication.run(App5.class, args); } }
2. 通過方法完成Listener組件注冊
編寫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....."); } }
編寫啟動器類
/** * SpringBoot整合Listener方式二 * * */ @SpringBootApplication public class App6 { public static void main(String[] args) { SpringApplication.run(App6.class, args); } /** * 注冊listener */ @Bean public ServletListenerRegistrationBean<SecondListener> getServletListenerRegistrationBean(){ ServletListenerRegistrationBean<SecondListener> bean= new ServletListenerRegistrationBean<SecondListener>(new SecondListener()); return bean; } }
四、訪問靜態資源
1. SpringBoot可在classpath/static的目錄下存放靜態資源
2. SpringBoot可在ServletContext根目錄下存放靜態資源
在src/main/webapp 目錄名稱必須要webapp
五、文件上傳
1.編寫Controller類
/** * SpringBoot文件上傳 * * */ //@Controller @RestController //表示該類下的方法的返回值會自動做json格式的轉換 public class FileUploadController { /* * 處理文件上傳 */ @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.編寫啟動器類
/** * SpringBoot文件上傳 * * */ @SpringBootApplication public class App7 { public static void main(String[] args) { SpringApplication.run(App7.class, args); } }
3.編寫application.properties配置文件，設置上傳文件大小的默認值
spring.servlet.multipart.max-file-size=200MB
spring.servlet.multipart.max-request-size=200MB
設置單個上傳文件的大小：spring.servlet.multipart.max-file-size=200MB
設置一次請求上傳文件的總容量：spring.servlet.multipart.max-request-size=200MB
總結
本篇簡單介紹了SpringBoot整合Servlet、Filter、Listener、以及SpringBoot上傳文件的方式，下一篇將介紹SpringBoot視圖層技術。