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package com.demo.c_response;
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;
/**
* 案例:定时刷新(Refresh)
*/
@SuppressWarnings("serial")
@WebServlet("/ResponseDemo3")
public class ResponseDemo3 extends HttpServlet {
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
/*
* 定时刷新 refresh
* 原理:浏览器认识 refresh 头,当浏览器得到 refresh 头之后,根据 refresh 头的值,间隔指定的时间之后
* 重新请求当前资源,再次获取到 refresh 头,循环执行。
*/
// response.setHeader("refresh", "1"); // 参数2为秒数,表示每隔一秒刷新此页面
/*
* 隔 n 秒之后跳转到另外的页面
*/
response.setHeader("refresh", "3;url=/02_Servlet/index.html"); // 隔3秒之后,跳转到url的地址
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doGet(request, response);
}
}