（1）为什么我们要防止这个问题的浏览器页面缓存：

所以在不须要缓存的页面中须要实现不缓存页面。

代码例如以下：

package com.lc.HttpTest;import java.io.IOException;import java.io.PrintWriter;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;public class CacheJiejue extends HttpServlet {	public void doGet(HttpServletRequest request, HttpServletResponse response)			throws ServletException, IOException {		response.setContentType("text/html;charset=utf-8");		//指定该页面不缓存		response.setDateHeader("Expires",-1); //IE游览器支持的				//保证兼容性		response.setHeader("Cache-Control", "no-cache");		response.setHeader("Pragme", "no-cache");			}	public void doPost(HttpServletRequest request, HttpServletResponse response)			throws ServletException, IOException {		this.doGet(request, response);	}}

（2）可是假设要实现特定时间内的页面缓存 则代码例如以下：

package com.lc.HttpTest;import java.io.IOException;import java.io.PrintWriter;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;public class CacheJiejue extends HttpServlet {	public void doGet(HttpServletRequest request, HttpServletResponse response)			throws ServletException, IOException {		response.setContentType("text/html;charset=utf-8");		//指定该页面不缓存		//response.setDateHeader("Expires",-1); //IE游览器支持的				//缓存一定的时间  缓存 一天的时间		response.setDateHeader("Expires",System.currentTimeMillis()+3600*1000*24); 		//保证兼容性		response.setHeader("Cache-Control", "no-cache");		response.setHeader("Pragme", "no-cache");			}	public void doPost(HttpServletRequest request, HttpServletResponse response)			throws ServletException, IOException {		this.doGet(request, response);	}}

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