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Filter过滤器的拦截路径配置

时间：2018-08-09 22:33:26

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Filter过滤器的拦截路径配置

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 -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 -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 -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() {}}