Java Servelet 做一个简单的分IP访问统计系统

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Java Servelet 做一个简单的分IP访问统计系统

实现流程:
未命名文件.png

代码实现

AListener.java,监听,启动tomcat就创建map集合

package cn.alone88;
import java.util.LinkedHashMap;
import java.util.List;
import    java.util.Map;

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.HttpSessionEvent;
import javax.servlet.http.HttpSessionListener;
import javax.servlet.http.HttpSessionBindingEvent;

@WebListener()
public class AListener implements ServletContextListener,
        HttpSessionListener, HttpSessionAttributeListener {

    // Public constructor is required by servlet spec
    public AListener() {
    }

    // -------------------------------------------------------
    // ServletContextListener implementation
    // -------------------------------------------------------
    public void contextInitialized(ServletContextEvent sce) {
     
      Map<String, Integer> map = new LinkedHashMap<String, Integer>();

        ServletContext application = sce.getServletContext();

        application.setAttribute("map", map);
    }

    public void contextDestroyed(ServletContextEvent sce) {
    }

    // -------------------------------------------------------
    // HttpSessionListener implementation
    // -------------------------------------------------------
    public void sessionCreated(HttpSessionEvent se) {
    }
    
    public void sessionDestroyed(HttpSessionEvent se) {
    }

    // -------------------------------------------------------
    // HttpSessionAttributeListener implementation
    // -------------------------------------------------------

    public void attributeAdded(HttpSessionBindingEvent sbe) {
    }

    public void attributeRemoved(HttpSessionBindingEvent sbe) {
    }

    public void attributeReplaced(HttpSessionBindingEvent sbe) {
    }
}

AFilter.java 拦截器,拦截IP,写入Map

package cn.alone88;
import    java.util.LinkedHashMap;
import    java.util.Map;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import java.io.IOException;

@WebFilter(filterName = "AFilter")
public class AFilter implements Filter {
    private ServletContext config;
    public void destroy() {
    }

    public void doFilter(ServletRequest req, ServletResponse resp, FilterChain chain) throws ServletException, IOException {

        //得到ServletContext map
        // 得到IP
        // 查看map是否存在ip

        ServletContext app = this.config;

        //获取Map
        Map<String, Integer> map = (Map<String, Integer>)app.getAttribute("map");

        // 获取IP
        String ip = req.getRemoteAddr();

        //判断IP是否已存在
        if(map.containsKey(ip)){
            int cnt = map.get(ip);
            map.put(ip,cnt + 1);
        }else{
            map.put(ip,1);
        }

        app.setAttribute("map",map);

        chain.doFilter(req, resp);
    }

    public void init(FilterConfig config) throws ServletException {
       this.config = config.getServletContext();
    }

}

Ip.jsp 页面展示 ,通过c:forEach 遍历集合

<%@ page import="java.util.Map" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body>

<table border="1">
    <tr>
        <th>Ip</th>
        <th>次数</th>
    </tr>
    <c:forEach items="${ applicationScope.map }" var="entry">
        <tr>
            <td>${entry.key}</td>
            <td>${entry.value}</td>
        </tr>
    </c:forEach>
</table>
</body>
</html>
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