JavaWeb19.4【Filter&Listener:Filter过滤器链(配置多个过滤器)】
1 package com.haifei.web.filter; 2 3 import javax.servlet.*; 4 import javax.servlet.annotation.WebFilter; 5 import java.io.IOException; 6 7 /** 8 * 过滤器链(配置多个过滤器) 9 */ 10 @WebFilter("/*") 11 public class FilterDemo6 implements Filter { 12 public void doFilter(ServletRequest req, ServletResponse resp, FilterChain chain) throws ServletException, IOException { 13 System.out.println("FilterDemo6执行了"); 14 chain.doFilter(req, resp); 15 System.out.println("FilterDemo6回来了"); 16 } 17 18 public void init(FilterConfig config) throws ServletException { 19 20 } 21 22 public void destroy() { 23 24 } 25 26 }
1 package com.haifei.web.filter; 2 3 import javax.servlet.*; 4 import javax.servlet.annotation.WebFilter; 5 import java.io.IOException; 6 7 /** 8 * 过滤器链(配置多个过滤器) 9 */ 10 //@WebFilter("/*") 11 public class FilterDemo7 implements Filter { 12 public void doFilter(ServletRequest req, ServletResponse resp, FilterChain chain) throws ServletException, IOException { 13 System.out.println("FilterDemo7执行了"); 14 chain.doFilter(req, resp); 15 System.out.println("FilterDemo7回来了"); 16 17 /* 18 http://localhost:8080/day19/index.jsp 19 20 FilterDemo6执行了 21 FilterDemo7执行了 22 index.jsp 23 FilterDemo7回来了 24 FilterDemo6回来了 25 */ 26 } 27 28 public void init(FilterConfig config) throws ServletException { 29 30 } 31 32 public void destroy() { 33 34 } 35 36 }
1 package com.haifei.web.filter; 2 3 import javax.servlet.*; 4 import javax.servlet.annotation.WebFilter; 5 import java.io.IOException; 6 7 /** 8 * 过滤器链(配置多个过滤器) 9 */ 10 @WebFilter("/*") 11 public class FilterDemo17 implements Filter { 12 public void doFilter(ServletRequest req, ServletResponse resp, FilterChain chain) throws ServletException, IOException { 13 System.out.println("FilterDemo17执行了"); 14 chain.doFilter(req, resp); 15 System.out.println("FilterDemo17回来了"); 16 17 /* 18 http://localhost:8080/day19/index.jsp 19 20 FilterDemo17执行了 21 FilterDemo6执行了 22 index.jsp 23 FilterDemo6回来了 24 FilterDemo17回来了 25 */ 26 } 27 28 public void init(FilterConfig config) throws ServletException { 29 30 } 31 32 public void destroy() { 33 34 } 35 36 }