JSP 开发之Servlet解决网页缓存问题

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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); 
  } 
 
}

以上就是Servlet解决网页缓存的实例详解，如有疑问请留言或者到本站社区交流讨论，感谢阅读，希望能帮助到大家，谢谢大家对本站的支持！