Filter作业

最新推荐文章于 2023-03-26 19:17:20 发布

zy6648

最新推荐文章于 2023-03-26 19:17:20 发布

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CC 4.0 BY-SA版权

本文链接：https://blog.youkuaiyun.com/zy6648/article/details/79672731

实现一个日志过滤器。要求每次访问应用中的任何路径时，日志都能记录当前访问的路径。

提示：当前访问的路径可以考虑使用HttpServletRequest中的getRequestURI()方法。

a.jsp

<%@ page contentType="text/html; charset=utf-8" pageEncoding="utf-8"%>
<!DOCTYPE html>
<html>
<head>
<meta  charset="utf-8">
<title>网页a</title>
</head>
<body>
    <h2>欢迎来到a页面~~~</h2>
</body>
</html>

b.jsp

<%@ page contentType="text/html; charset=utf-8" pageEncoding="utf-8"%>
<!DOCTYPE html>
<html>
<head>
<meta  charset="utf-8">
<title>网页b</title>
</head>
<body>
    <h2>欢迎来到b页面~~~</h2>
</body>
</html>

Filter_log.java

package filter;

import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import com.sun.net.httpserver.Filter.Chain;

public class Filter_log implements Filter{

	@Override
	public void destroy() {
		System.out.println("Filter_log销毁了~~~");
	}

	@Override
	public void doFilter(ServletRequest request, ServletResponse response,
			FilterChain chain) throws IOException, ServletException {
		System.out.println("Filter_log进入doFilter~~~");
		HttpServletRequest req=(HttpServletRequest)request;
		String path=req.getRequestURI();
		System.out.println("当前访问页面的路径为："+path);
		chain.doFilter(request,response);
		System.out.println("Filter_log将要离开doFilter~~~");
	}

	@Override
	public void init(FilterConfig fc) throws ServletException {
		System.out.println("Filter_log初始化了~~~");
	}
}

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">
  <display-name>Test-F_L</display-name>
  <welcome-file-list>
    <welcome-file>index.html</welcome-file>
    <welcome-file>index.htm</welcome-file>
    <welcome-file>index.jsp</welcome-file>
    <welcome-file>default.html</welcome-file>
    <welcome-file>default.htm</welcome-file>
    <welcome-file>default.jsp</welcome-file>
  </welcome-file-list>
  <filter>
     <filter-name>FilterLog</filter-name>
     <filter-class>filter.Filter_log</filter-class>
  </filter>
  <filter-mapping>
      <filter-name>FilterLog</filter-name>
      <url-pattern>/log/*</url-pattern>
  </filter-mapping>
 
  <servlet>
       <servlet-name>ListenerU</servlet-name>
       <servlet-class>listener.ServletUser</servlet-class>
  </servlet>
  <servlet-mapping>
       <servlet-name>ListenerU</servlet-name>
       <url-pattern>/user/ListenerUser</url-pattern>
  </servlet-mapping>
  
  <servlet>
       <servlet-name>ListenerD</servlet-name>
       <servlet-class>listener.ServletDelete</servlet-class>
  </servlet>
  <servlet-mapping>
       <servlet-name>ListenerD</servlet-name>
       <url-pattern>/user/ListenerDelete</url-pattern>
  </servlet-mapping>
  
</web-app>