一、Servlet实现定时刷新到另外一个页面response.setHeader(“refresh”, “3;url=/…”)
目的：访问本页面，3秒钟后跳转到1.png图片页面
方法 == response.setHeader(“refresh”, “3;url=/ResponseDemo/ResponseDemo10”); ==
解读： 这个refresh是使用get方式跳转，url中可以携带参数和数据。setHeader设置响应头，浏览器根据http响应头执行。如图所示，目的页面既可以是一个jsp,html页面，也可以是一个资源文件
package com.item;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* Servlet implementation class Refresh
*/
@WebServlet("/Refresh")
public class Refresh extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public Refresh() {
super();
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
//三秒跳转
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
//告诉浏览器本程序使用的编码格式
response.setContentType("text/html; charset=utf-8");
//写入流
response.getWriter().write("三秒跳转");
//1.png为资源文件
response.setHeader("Refresh", "3;url=http://localhost:8080/day/1.png");//1.jpg为资源文件
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
doGet(request, response);
}
}
二、html定时跳转
通常我们不使用sevlet跳转，一般在html页面就进行跳转
方法：使用meta头
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="refresh" content="3;url=http://localhost:8080/day/1.png">
</head>
<body>
三秒跳转...
</body>
</html>
