<?xml version="1.0" encoding="UTF-8"?> <web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"version="3.1"><filter><filter-name>demo1</filter-name><filter-class>com.learn.web.filter.FilterDemo1</filter-class></filter><filter-mapping><filter-name>demo1</filter-name><!-- 攔截路徑 --><url-pattern>/*</url-pattern></filter-mapping></web-app> package com.learn.web.filter;import javax.servlet.*; import javax.servlet.annotation.WebFilter; import java.io.IOException;//@WebFilter("/*")//訪問所有資源之前，都會執行該過濾器 public class FilterDemo1 implements Filter {@Overridepublic void init(FilterConfig filterConfig) throws ServletException {}@Overridepublic void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain)throws IOException, ServletException {System.out.println("filterDemo1被執行了....");//放行filterChain.doFilter(servletRequest,servletResponse);}@Overridepublic void destroy() {} } // // Source code recreated from a .class file by IntelliJ IDEA // (powered by Fernflower decompiler) //package javax.servlet.annotation;import java.lang.annotation.Documented; import java.lang.annotation.ElementType; import java.lang.annotation.Retention; import java.lang.annotation.RetentionPolicy; import java.lang.annotation.Target; import javax.servlet.DispatcherType;@Target({ElementType.TYPE}) @Retention(RetentionPolicy.RUNTIME) @Documented public @interface WebFilter {String description() default "";String displayName() default "";WebInitParam[] initParams() default {};String filterName() default "";String smallIcon() default "";String largeIcon() default "";String[] servletNames() default {};String[] value() default {};String[] urlPatterns() default {};DispatcherType[] dispatcherTypes() default {DispatcherType.REQUEST};boolean asyncSupported() default false; }

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