Filter过滤器的拦截路径配置

article/2025/9/6 9:50:35

Filter的介绍

拦截路径配置

拦截所有资源：/*

具体资源路径：/myServlet/demo1

拦截目录：/myServlet/*

后缀名被拦截：*.jsp

Filter的介绍

拦截路径配置

过滤器的拦截路径一般有这4种方式

拦截所有资源：/*，访问所有的资源，过滤器都会被执行
具体资源路径：/myServlet/demo1，只有访问myServlet/demo1资源时，过滤器才会被执行
拦截目录：/myServlet/*，访问/myServlet下所有资源是，过滤器都会被执行
后缀名被拦截：*.jsp，访问后缀名为jsp资源时，过滤器都会被执行

下面我们就举例演示这4种方式

来2个Servlet，资源路径分别取为/myServlet/demo1和/myServlet/demo2，一个jsp页面，myJSP.jsp，一个过滤器demo1

/myServlet/demo1代码

package com.lingaolu.servlet;import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.*;
import java.io.IOException;/*** @author 林高禄* @create 2020-08-04-19:34*/
@WebServlet("/myServlet/demo1")
public class Demo1 extends HttpServlet {@Overrideprotected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {System.out.println("/myServlet/demo1执行了......");}@Overrideprotected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {this.doPost(request, response);}
}

/myServlet/demo2代码

package com.lingaolu.servlet;import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.*;
import java.io.IOException;/*** @author 林高禄* @create 2020-08-04-19:34*/
@WebServlet("/myServlet/demo2")
public class Demo2 extends HttpServlet {@Overrideprotected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {System.out.println("/myServlet/demo2执行了......");}@Overrideprotected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {this.doPost(request, response);}
}

myJSP.jsp代码

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head><title>我的JSP</title>
</head>
<body><% System.out.println("myJSP进来了......");%>
</body>
</html>

过滤器demo1代码

package com.lingaolu.filter;import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import java.io.IOException;/*** @author 林高禄* @create 2020-08-04-9:42*/
@WebFilter("/*")
public class Demo1 implements Filter {@Overridepublic void init(FilterConfig filterConfig) throws ServletException {}@Overridepublic void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {System.out.println("demo1过滤器进来了......");filterChain.doFilter(servletRequest,servletResponse);System.out.println("demo1过滤回来了......");}@Overridepublic void destroy() {}
}