JavaWeb19.3【Filter&Listener：过滤器Filter的拦截路径配置和拦截方式配置】

 

 

 1 <%--
 2   Created by IntelliJ IDEA.
 3   User: yubaby
 4   Date: 2021/7/4
 5   Time: 21:35
 6   To change this template use File | Settings | File Templates.
 7 --%>
 8 <%@ page contentType="text/html;charset=UTF-8" language="java" %>
 9 <html>
10   <head>
11     <title>$Title$</title>
12   </head>
13   <body>
14   index.jsp
15 
16   <%
17     System.out.println("index.jsp");
18   %>
19   </body>
20 </html>
 1 <%--
 2   Created by IntelliJ IDEA.
 3   User: yubaby
 4   Date: 2021/7/5
 5   Time: 15:20
 6   To change this template use File | Settings | File Templates.
 7 --%>
 8 <%@ page contentType="text/html;charset=UTF-8" language="java" %>
 9 <html>
10 <head>
11     <title>Title</title>
12 </head>
13 <body>
14 hello.jsp
15 
16 <%
17     System.out.println("hello.jsp");
18 %>
19 </body>
20 </html>
 1 package com.haifei.web.servlet;
 2 
 3 import javax.servlet.ServletException;
 4 import javax.servlet.annotation.WebServlet;
 5 import javax.servlet.http.HttpServlet;
 6 import javax.servlet.http.HttpServletRequest;
 7 import javax.servlet.http.HttpServletResponse;
 8 import java.io.IOException;
 9 
10 @WebServlet("/user/FindAllServlet")
11 public class ServletDemo1 extends HttpServlet {
12     protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
13         System.out.println("FindAllServlet......");
14     }
15 
16     protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
17         this.doPost(request, response);
18     }
19 }
 1 package com.haifei.web.servlet;
 2 
 3 import javax.servlet.ServletException;
 4 import javax.servlet.annotation.WebServlet;
 5 import javax.servlet.http.HttpServlet;
 6 import javax.servlet.http.HttpServletRequest;
 7 import javax.servlet.http.HttpServletResponse;
 8 import java.io.IOException;
 9 
10 @WebServlet("/user/UpdateServlet")
11 public class ServletDemo2 extends HttpServlet {
12     protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
13         System.out.println("UpdateServlet......");
14     }
15 
16     protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
17         this.doPost(request, response);
18     }
19 }
 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  * 过滤器细节 之 拦截路径配置
 9  */
10 //@WebFilter("/index.jsp")
11 //@WebFilter("/user/*")
12 //@WebFilter("/user/FindAllServlet")
13 //@WebFilter("*.jsp")
14 //@WebFilter("/*")
15 public class FilterDemo4 implements Filter {
16     public void doFilter(ServletRequest req, ServletResponse resp, FilterChain chain) throws ServletException, IOException {
17         System.out.println("FilterDemo4");
18         chain.doFilter(req, resp);
19 
20         /*
21         http://localhost:8080/day19/index.jsp
22         FilterDemo4
23         index.jsp
24 
25         http://localhost:8080/day19/hello.jsp
26         hello.jsp
27          */
28 
29         /*
30         http://localhost:8080/day19/user/FindAllServlet
31         FilterDemo4
32         FindAllServlet......
33 
34         http://localhost:8080/day19/user/UpdateServlet
35         FilterDemo4
36         UpdateServlet......
37          */
38 
39         /*
40         http://localhost:8080/day19/user/FindAllServlet
41         FilterDemo4
42         FindAllServlet......
43 
44         http://localhost:8080/day19/user/UpdateServlet
45         UpdateServlet......
46          */
47 
48         /*
49         http://localhost:8080/day19/hello.jsp
50         FilterDemo4
51         hello.jsp
52 
53         http://localhost:8080/day19/user/FindAllServlet
54         FindAllServlet......
55          */
56     }
57 
58     public void init(FilterConfig config) throws ServletException {
59 
60     }
61 
62     public void destroy() {
63 
64     }
65 
66 }

 

 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  * 过滤器细节 之 拦截方式配置
 9  */
10 //@WebFilter(value = "/index.jsp", dispatcherTypes = DispatcherType.REQUEST) //浏览器直接请求index.jsp资源时，该过滤器会被执行
11 //@WebFilter(value = "/index.jsp", dispatcherTypes = DispatcherType.FORWARD) //只有转发访问index.jsp时，该过滤器才会被执行
12 //@WebFilter(value = "/index.jsp", dispatcherTypes = {DispatcherType.REQUEST, DispatcherType.FORWARD}) //浏览器直接请求index.jsp或者转发访问index.jsp，该过滤器都会被执行
13 //@WebFilter(value = "/*", dispatcherTypes = {DispatcherType.REQUEST, DispatcherType.FORWARD}) //浏览器直接请求index.jsp或者转发访问index.jsp，该过滤器都会被执行
14 public class FilterDemo5 implements Filter {
15     public void doFilter(ServletRequest req, ServletResponse resp, FilterChain chain) throws ServletException, IOException {
16         System.out.println("FilterDemo5.....");
17         chain.doFilter(req, resp);
18 
19         /*
20         http://localhost:8080/day19/index.jsp
21             FilterDemo5.....
22             index.jsp
23 
24         http://localhost:8080/day19/user/UpdateServlet
25             UpdateServlet......
26             index.jsp
27          */
28 
29         /*
30         http://localhost:8080/day19/index.jsp
31             index.jsp
32 
33         http://localhost:8080/day19/user/UpdateServlet
34             UpdateServlet......
35             FilterDemo5.....
36             index.jsp
37          */
38 
39         /*
40         http://localhost:8080/day19/index.jsp
41             FilterDemo5.....
42             index.jsp
43 
44         http://localhost:8080/day19/user/UpdateServlet
45             UpdateServlet......
46             FilterDemo5.....
47             index.jsp
48          */
49 
50          /*
51         http://localhost:8080/day19/index.jsp
52             FilterDemo5.....
53             index.jsp
54 
55         http://localhost:8080/day19/user/UpdateServlet
56             FilterDemo5.....
57             UpdateServlet......
58             FilterDemo5.....
59             index.jsp
60          */
61     }
62 
63     public void init(FilterConfig config) throws ServletException {
64 
65     }
66 
67     public void destroy() {
68 
69     }
70 
71 }
 1 package com.haifei.web.servlet;
 2 
 3 import javax.servlet.ServletException;
 4 import javax.servlet.annotation.WebServlet;
 5 import javax.servlet.http.HttpServlet;
 6 import javax.servlet.http.HttpServletRequest;
 7 import javax.servlet.http.HttpServletResponse;
 8 import java.io.IOException;
 9 
10 @WebServlet("/user/UpdateServlet")
11 public class ServletDemo2 extends HttpServlet {
12     protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
13         System.out.println("UpdateServlet......");
14 
15         //转发到index.jsp
16         request.getRequestDispatcher("/index.jsp").forward(request, response);
17     }
18 
19     protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
20         this.doPost(request, response);
21     }
22 }
 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
 3          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 4          xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
 5          version="3.1">
 6 
 7 
 8     <!--<filter>
 9         <filter-name>demo1</filter-name>
10         <filter-class>com.haifei.web.filter.FilterDemo1</filter-class>
11     </filter>
12     <filter-mapping>
13         <filter-name>demo1</filter-name>
14         <url-pattern>/*</url-pattern>  &lt;!&ndash;拦截路径&ndash;&gt;
15     </filter-mapping>-->
16 
17     <!--<filter>
18         <filter-name>demo5</filter-name>
19         <filter-class>com.haifei.web.filter.FilterDemo5</filter-class>
20     </filter>
21     <filter-mapping>
22         <filter-name>demo5</filter-name>
23         <url-pattern>/*</url-pattern>
24         <dispatcher>REQUEST</dispatcher>  &lt;!&ndash;拦截方式&ndash;&gt;
25     </filter-mapping>-->
26 
27 </web-app>

 

posted @ 2021-07-05 15:38  yub4by  阅读(126)  评论(0)    收藏  举报