http协议--响应信息头案例二(实现定时刷新和隔n秒之后跳转到另外的资源)
实现的功能一:对目前页面实现每隔一秒刷新一次
实现的功能二:隔3秒后从当前页面跳转到"/dat08_web/testParam.html"页面
实现的主程序:Demo_Response2.java
package Response;
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;
/*
* 案例二:定时刷新
*/
public class Demo_Response2 extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
/*
* 定时刷新
* 原理:浏览器认识refresh头,得到refresh头之后重新请求当前资源
*/
// response.setHeader("refresh", "1");//每隔一秒刷新一次页面
/*
* 隔n秒之后跳转另外的资源
*/
response.setHeader("refresh", "3;url=/day08_web/testParam.html");//隔3秒之后跳转到testParam.html页面
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
}
}