JSP 开发之Servlet解决网页缓存问题


            JSP 开发之Servlet解决网页缓存问题

（1）我们为什么要防止游览器页面缓存的问题：



所以在不需要缓存的页面中需要实现不缓存页面；



代码如下：







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）但是如果要实现特定时间内的页面缓存 则代码如下：





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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