程序人生网站首页 程序人生

6_Filter_细节_过滤器拦截路径配置（servlet拦截与目录拦截和具体资源路径拦截）

发布时间：2022-09-25 19:32:35编辑：雪饮阅读（）

首先重置下上篇中的web/index.jsp:

<%--
Created by IntelliJ IDEA.
User: Administrator
Date: 2022/9/23
Time: 21:41
To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>$Title$</title>
</head>
<body>
$END$
</body>
</html>

精准路由拦截

匹配到具体的url资源，示例如

Filter2.java:

package package3;
 
 import javax.servlet.*;
 import javax.servlet.annotation.WebFilter;
 import java.io.IOException;
 /*
 拦截资源的具体路径，
 这里如访问“http://localhost:8080/day19_war_exploded/index.jsp”
 或者"http://localhost:8080/day19_war_exploded/"
 或者"http://localhost:8080/day19_war_exploded"
 时候才能被拦截到，当然后两种都是由于默认文档以及可能是浏览器自己补全或者tomcat之类的自己给处理的吧。
 */
 @WebFilter("/index.jsp")
 public class Filter2 implements Filter {
     public void init(FilterConfig config) throws ServletException {
     }
     public void doFilter(ServletRequest req, ServletResponse resp, FilterChain chain) throws ServletException, IOException {
         System.out.println("----------Filter2=>index.jsp被访问");
         chain.doFilter(req, resp);
     }
     public void destroy() {
 
     }
 }

路由模糊匹配拦截

比如我们需要拦截user新增和user修改这两个servlet路由的拦截（filter支持对servlet的拦截（这不废话。。。）），或者准确点说就是对user这个目录下所有访问都拦截。

则首先假如我们有新增的servlet如：

ServletAdd.java：

package package3;
 
 import javax.servlet.ServletException;
 import javax.servlet.annotation.WebServlet;
 import javax.servlet.http.HttpServlet;
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
 import java.io.IOException;
 
 @WebServlet("/user/addServlet")
 public class ServletAdd extends HttpServlet {
     protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
         System.out.println("---ServletAdd被访问");
     }
 
     protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
         this.doPost(request, response);
     }
 }

然后有ServletUpdate.java:

package package3;
 
 import javax.servlet.ServletException;
 import javax.servlet.annotation.WebServlet;
 import javax.servlet.http.HttpServlet;
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
 import java.io.IOException;
 
 @WebServlet("/user/updateServlet")
 public class ServletUpdate extends HttpServlet {
     protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
         System.out.println("---ServletUpdate被访问");
     }
 
     protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
         this.doPost(request, response);
     }
 }

最后就是具体的filter拦截目录的实例如

FilterServlet.java:

package package3;
 
 import javax.servlet.*;
 import javax.servlet.annotation.WebFilter;
 import java.io.IOException;
 /*
 * 拦截目录
 * 这里具体就是以访问如
 *http://localhost:8080/day19_war_exploded/user/xx
 * http://localhost:8080/day19_war_exploded/user
 * http://localhost:8080/day19_war_exploded/user/
 * http://localhost:8080/day19_war_exploded/user/addServlet
 * http://localhost:8080/day19_war_exploded/user/updateServlet
 *即便这些url里面可能有404，只要匹配到user目录了，则都会被拦截
 * */
 @WebFilter("/user/*")
 public class FilterServlet implements Filter {
     public void destroy() {
     }
 
     public void doFilter(ServletRequest req, ServletResponse resp, FilterChain chain) throws ServletException, IOException {
         System.out.println("---FilterServlet被访问");
         chain.doFilter(req, resp);
     }
 
     public void init(FilterConfig config) throws ServletException {
 
     }
 
 }

关键字词：Filter,细节,过滤器拦截路径配置,servlet拦截,目录拦截,具体资源路径拦截

上一篇：5_Filter_细节_执行流程&生命周期(filter创建模板与生命周期)

下一篇：7_Filter_细节_过滤器拦截方式配置（区分拦截浏览器直接请求或内部forward请求）

您当前的位置： 首页 > 慢生活 > 程序人生 网站首页程序人生

6_Filter_细节_过滤器拦截路径配置（servlet拦截与目录拦截和具体资源路径拦截）

相关文章

您当前的位置：首页 > 慢生活 > 程序人生网站首页程序人生