package com.servlet;
import java.io.IOException;
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;
/*
* 从ServletContext对象中获取值,然后再存入值
*/
@WebServlet("/CountServlet")
public class CountServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
public void init() throws ServletException {
ServletContext context = this.getServletContext();
//向ServletContext对象中存入变量,初始值为0
//设置一个变量
context.setAttribute("count",0);
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
ServletContext context = this.getServletContext();
//从context中获取count,并且自增加一
//取出变量
Integer count = (Integer) context.getAttribute("count");
//让count自加1
count++;
//覆盖之前count的值
context.setAttribute("count", count);
//将count的值显示到页面上
response.setContentType("text/html;charset=UTF-8");
response.getWriter().write("访问次数:"+count);
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doGet(request, response);
}
}
WEB项目-通过ServletContext对象来统计网站的访问次数
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转载自blog.csdn.net/Tommy5553/article/details/85237082
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