分ip统计网站访问次数

时间：2022-03-15 21:12:32
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Map

10 * 从request中得到当前客户端的IP

11 * 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map

22         * 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1

25         * */

26         /*

27         * 1、得到application

28         * */

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>

相关文章