package web.listener;import javax.servlet.ServletContext;import javax.servlet.ServletContextEvent;import javax.servlet.ServletContextListener;import javax.servlet.annotation.WebListener;import javax.servlet.http.HttpSessionAttributeListener;import javax.servlet.http.HttpSessionListener;import java.util.LinkedHashMap;import java.util.Map;@WebListener()public class AListener implements ServletContextListener, ???????HttpSessionListener, HttpSessionAttributeListener { ???/* ???* 在服务启动时创建Map，保存到ServletContext ???* */ ???public void contextInitialized(ServletContextEvent sce) { ???????//创建Map ???????Map<String,Integer> map = new LinkedHashMap<String, Integer>(); ???????//得到ServletContext ???????ServletContext application = sce.getServletContext(); ???????application.setAttribute("map",map); ???} ???public void contextDestroyed(ServletContextEvent sce) { ???}}
1 package web.filter; 2 ?3 import javax.servlet.*; 4 import javax.servlet.annotation.WebFilter; 5 import java.io.IOException; 6 import java.util.Map; 7 ?8 /* 9 * 从application中获取Map10 * 从request中得到当前客户端的IP11 * 进行统计工作，结果保存到Map中12 * */13 @WebFilter(filterName = "AFilter",urlPatterns = "/*")14 public class AFilter implements Filter {15 ????private FilterConfig config;16 ????public void destroy() {17 ????}18 19 ????public void doFilter(ServletRequest req, ServletResponse resp, FilterChain chain) throws ServletException, IOException {20 ????????/*21 ????????* 1、得到application中的map22 ????????* 2、从request中获取当前客户端的IP地址23 ????????* 3、查看map中是否存在这个IP对应访问次数，如果存在，把次数+1再保存回去24 ????????* 4、如果不存在这个IP，那么说明是第一次访问本站，设置访问次数为125 ????????* */26 ????????/*27 ????????* 1、得到application28 ????????* */29 ????????ServletContext app = config.getServletContext();30 ????????Map<String,Integer> map = (Map<String,Integer>) app.getAttribute("map");31 ????????/*32 ????????* 2、得到客户端的ip地址33 ????????* */34 ????????String ip = req.getRemoteAddr();35 ????????/*36 ????????*3、进行判断37 ????????* */38 ????????if (map.containsKey(ip)) {39 ????????????int cnt = map.get(ip);40 ????????????map.put(ip,cnt+1);41 ????????}else {42 ????????????map.put(ip,1);43 ????????}44 ????????app.setAttribute("map",map);45 46 ????????chain.doFilter(req, resp);//肯定放行47 ????}48 ????/*49 ????* 在服务器启动时就会执行本方法，而且本方法只执行一次50 ????* */51 ????public void init(FilterConfig config) throws ServletException {52 ????????this.config= config;53 ????}54 } 1 <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %> 2 <%-- 3 ??Created by IntelliJ IDEA. 4 ??User: Mac 5 ??Date: 13/09/2017 6 ??Time: 12:37 PM 7 ??To change this template use File | Settings | File Templates. 8 --%> 9 <%@ page contentType="text/html;charset=UTF-8" language="java" %>10 <html>11 <head>12 ????<title>Title</title>13 </head>14 <body>15 <h1>显示结果</h1>16 <table align="center" width="60%" border="1">17 ????<tr>18 ????????<td>ip</td>19 ????????<td>次数</td>20 ????</tr>21 ????<c:forEach items="${applicationScope.map}" var="entry">22 ????<tr>23 ????????<td>${entry.key}</td>24 ????????<td>${entry.value}</td>25 ????</tr>26 ????</c:forEach>27 </table>28 </body>29 </html>分ip统计网站访问次数
原文地址：http://www.cnblogs.com/gdwkong/p/7635545.html