Servlet网站访问量统计小案例

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Servlet网站访问量统计小案例

package com.servlet;import java.io.IOException;import java.io.PrintWriter;import javax.servlet.ServletContext;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;public class AServlet extends HttpServlet {    public void doGet(HttpServletRequest request, HttpServletResponse res)            throws ServletException, IOException {        /*         * 1. 获取ServletContext对象         * 2. 从ServletContext对象中获取名为count的属性         *   3. 如果存在：给访问量加1，然后再保存回去；         *   4. 如果不存在：说明是第一次访问，向Servletcontext中保存名为count的属性，值为1         */        ServletContext application = this.getServletContext();        Integer count = (Integer) application.getAttribute("count");        if (count == null) {            application.setAttribute("count", 1);        } else {            application.setAttribute("count", count+1);        }        res.setCharacterEncoding("utf-8");        res.setContentType("text/html;charset=utf-8");        /*         * 向浏览器输出         *   需要使用响应对象！         */        System.out.println("本网站访问量:"+count+"人");        PrintWriter out = res.getWriter();        out.print("本网站访问量:" + count + "人");        out.flush();        out.close();    }}

web.xml配置

<?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>Servlet03</display-name>  <servlet>    <servlet-name>AServlet</servlet-name>    <servlet-class>com.servlet.AServlet</servlet-class>  </servlet>  <servlet-mapping>    <servlet-name>AServlet</servlet-name>    <url-pattern>/AServlet</url-pattern>  </servlet-mapping>  <welcome-file-list>    <welcome-file>index.jsp</welcome-file>  </welcome-file-list></web-app>

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