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10Java金币 
总提示The requested resource is not available,请大家看看哈 
CountFilter代码:(src/com/cn/CountFilter.java) 
 
package com.cn; 
 
import java.io.IOException; 
import javax.Servlet.Filter; 
import javax.servlet.FilterChain; 
import javax.servlet.FilterConfig; 
import javax.servlet.ServletContext; 
import javax.servlet.ServletException; 
import javax.servlet.ServletRequest; 
import javax.servlet.ServletResponse; 
import javax.servlet.annotation.WebFilter; 
import javax.servlet.http.HttpServletRequest; 
 
/** 
 * Servlet Filter implementation class CountFilter 
 */ 
@WebFilter("/CountFilter") 
public class CountFilter implements Filter { 
 
   private int count; 
   public void init(FilterConfig fConfig) throws ServletException { 
                String param=fConfig.getInitParameter("count"); 
                count=Integer.valueOf(param); 
 
        } 
    public CountFilter() { 
        // TODO Auto-generated constructor stub 
    } 
 
 
        public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException { 
                count++; 
                HttpServletRequest req=(HttpServletRequest)request; 
                ServletContext context=req.getSession().getServletContext(); 
                context.setAttribute("count", count); 
 
                chain.doFilter(request, response); 
        } 
 
        public void destroy() { 
                // TODO Auto-generated method stub 
        } 
 
 
} 
 
 
web.xml代码:(WebContent/WEB-INF/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>seventh</display-name> 
  <filter> 
  <filter-name>CountFilter</filter-name> 
  <filter-class>com.cn.CountFilter</filter-class> 
  <init-param> 
  <param-name>count</param-name> 
  <param-value>5000</param-value> 
   
  </init-param> 
  </filter> 
  <filter-mapping> 
  <filter-name>CountFilter</filter-name> 
  <url-pattern>/index.jsp</url-pattern> 
< /filter-mapping>                                                                                                                                                                                                                                                                                                                 
  <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> 
< /web-app> 
 
index.jsp代码:(WebContent/index.jsp) 
 
< %@ page language="java" contentType="text/html; charset=GB18030" 
    pageEncoding="GB18030"%> 
< !DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> 
< html> 
< head> 
< meta http-equiv="Content-Type" content="text/html; charset=GB18030"> 
< title>Insert title here</title> 
< /head> 
< body> 
welcome! 
< %=application.getAttribute("count") %> 
 
< /body> 
< /html> 
 
谢了! 
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