Flask接口签名sign原理与实例代码浅析
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2022-08-29
基于servlet实现统计网页访问次数
本文实例为大家分享了基于servlet实现统计网页访问次数的具体代码,供大家参考,具体内容如下
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.setCharacterEncohttp://ding("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.seDkeNotAttribute("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" +
"
out.print("
out.print("您是第 "+ servletContext.getAttribute("count")+"位访客");
out.print("
out.print("\r\n" +
"
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpDkeNoServletResponse 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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