设置不使用缓存

使用缓存可以加快页面的加载，降低服务端的负担。但是也可能看到过时的信息，可以通过如下手段通知浏览器不要使用缓存

 

response.setDateHeader("Expires",0 );

response.setHeader("Cache-Control","no-cache");

response.setHeader("pragma","no-cache");

 

import java.io.IOException;

import java.util.Date;

 

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

 

public class HelloServlet extends HttpServlet {

 

    public void doGet(HttpServletRequest request, HttpServletResponse response) {

 

        try {

            response.setDateHeader("Expires", 0);

            response.setHeader("Cache-Control", "no-cache");

            response.setHeader("pragma", "no-cache");

            response.getWriter().println("<h1>Hello Servlet!</h1>");

            response.getWriter().println(new Date().toLocaleString());

        } catch (IOException e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        }

    }

 

}