Filter_细节_web.xml配置方式
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Filter_细节_web.xml配置方式
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<?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(wèn)所有資源之前，都會(huì)執(zhí)行該過(guò)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(zhí)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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