如何使用servlet实现统计网页访问次数

这篇文章主要介绍如何使用servlet实现统计网页访问次数，文中介绍的非常详细，具有一定的参考价值，感兴趣的小伙伴们一定要看完！

一、基础知识

（1）ServletContext和ServletConfig的区别

ServletContext作为整个web应用的共享数据
ServletConfig只是作为当前servlet的数据共享，下一个servlet访问时，是访问不到的

二、代码实现

将显示的统计次数显示在HTML页面上：

import java.io.IOException;import java.io.PrintWriter;import javax.servlet.ServletContext;import javax.servlet.ServletException;import javax.servlet.annotation.WebServlet;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;/** * Servlet implementation class countServlet1 */@WebServlet("/countServlet1")public class countServlet1 extends HttpServlet {    private static final long serialVersionUID = 1L;           /**     * @see HttpServlet#HttpServlet()     */    public countServlet1() {        super();        // TODO Auto-generated constructor stub    }    /**     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)     */    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {        //设置字符编码        request.setCharacterEncoding("utf-8");        response.setCharacterEncoding("utf-8");        response.setContentType("text/html; charset=utf-8");                //获取全局的共享数据        ServletContext servletContext = this.getServletContext();                //获取计数器count        Integer count = (Integer) servletContext.getAttribute("count");                //如果获取的计算器对象为空 ，说明是第一次访问，并将count，放入servletCount        if( servletContext.getAttribute("count") == null) {            count = 1;            servletContext.setAttribute("count", count);        }else {            //否则就不是第一次访问，将登陆的计数器进行加1的数据更新            servletContext.setAttribute("count", count+1);        }                //将登陆的次数显示在页面上        PrintWriter out =response.getWriter();        out.print("\r\n" +                   "\r\n" +                   "\r\n" +                   "\r\n" +                   "\r\n" +                   "\r\n" +                   "");        out.print("
");        out.print("您是第 "+ servletContext.getAttribute("count")+"位访客");        out.print("
");        out.print("\r\n" +                   "}    /**     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)     */    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {        // TODO Auto-generated method stub        doGet(request, response);    }}

三、在不同浏览器显示的次数

（1）在eclipse中显示的次数

（2）在火狐中显示的次数

（3）在360中显示的次数

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