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本文链接：https://blog.youkuaiyun.com/qilinxo/article/details/72731283

本文介绍了一种在浏览器禁用Cookies的情况下实现用户访问次数计数的方法。通过使用Java Servlet技术，自动判断Cookies是否被禁用，并相应地在URL中附加Session ID来跟踪用户会话。

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在浏览器禁用cookies的情况下，实现访问次数的计数。

主要实现语句是：response.encodeURL("counter")

sessioin会在服务器第一次调用getSession方法时创建，服务器会将sessionID放在cookies里面返回给客户端。如果浏览器禁用了cookies，则浏览器就不能通过此方法获得sessionID。

encodeURL方法可以自动判断浏览器是否禁用了cookies，没有禁用则什么都不干，禁用了则会在URL之后加上sessionID。具体实现如下：

LoginCounter.java:

package com.qilin.servlet;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.Enumeration;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

public class LoginCounter extends HttpServlet{

	@Override
	protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
		
		HttpSession session = req.getSession();
		Enumeration<String> list = session.getAttributeNames();
		boolean sessionIsNew = true;
		while(list.hasMoreElements()) {
			if(list.nextElement().equals("times"))
				sessionIsNew = false;
		}
		if(sessionIsNew == false) {
			session.setAttribute("times", (Integer)session.getAttribute("times")+1);
		}
		else {
			session.setAttribute("times", 1);
		}
		//resp.encodeURL(req.getContextPath()+"/servlet/counter");
		StringBuffer sb = new StringBuffer("<html><head><title>")
				.append(session.getAttribute("times"))
				.append("</title></head></html>");
		resp.setContentType("text/html;charset=UTF-8");
		PrintWriter out = resp.getWriter();
		out.write(sb.toString());
		out.close();
		
	}

	@Override
	protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
		// TODO Auto-generated method stub
		this.doGet(req, resp);
	}
	
}

Main.jsp:

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
	<form action="<%=response.encodeURL("counter") %>" method="post">
		<td>
			<input type="submit" value="an" />
		</td>
	</form>
	
</body>
</html>

web.xml:

<servlet>
  	<servlet-name>counter</servlet-name>
  	<servlet-class>com.qilin.servlet.LoginCounter</servlet-class>
  </servlet>
  <servlet-mapping>
  	<servlet-name>counter</servlet-name>
  	<url-pattern>/counter</url-pattern>
  </servlet-mapping>