JSP 开发之Servlet解决网页缓存问题

Java  /  管理员 发布于 7年前   229

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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