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！
（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
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("<!DOCTYPE html>\r\n" +
"<html>\r\n" +
"<head>\r\n" +
"<meta charset=\"UTF-8\">\r\n" +
"<title>登陆网页次数统计</title>\r\n" +
"</head>\r\n" +
"<body>");
out.print("<h2>");
out.print("您是第 "+ servletContext.getAttribute("count")+"位访客");
out.print("<h2>");
out.print("</body>\r\n" +
"</html>
}
/**
* @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);
}
}（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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