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 }

 

posted @ 2021-07-05 16:47  yub4by  阅读(113)  评论(0)    收藏  举报