JavaNote 4.0 Servlet使用之自动刷新示例-优快云博客

本文链接：https://blog.youkuaiyun.com/LetsStudy/article/details/99890850

本文探讨了在Servlet中实现页面自动刷新及跳转的方法，通过设置响应头来控制浏览器在指定时间后刷新并跳转到新页面。同时，介绍了如何在JSP页面中使用meta标签达到相同的效果，确保用户在错误或特定情况下能自动导向目标页面。

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1、Servlet

package com.test;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@WebServlet(name = "Servlet_4",urlPatterns = "/refresh")
public class Servlet_4 extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
       String message = "3秒后自动刷新<a href='/login.html'>跳转链接</a>";
       request.setAttribute("message",message);
       request.getRequestDispatcher("/loginerror.jsp").forward(request,response);
    }

    private void refresh(HttpServletResponse response) throws IOException {
        response.setContentType("text/html;charset=utf-8");
        // response.setHeader("refresh","3");
        // response.setHeader("refresh","3;url=https://www.baidu.com");
        //自动刷新,右键refactor/extract可以对选定的代码进行抽取
        response.setHeader("refresh","3;url=/login.html");
        response.getWriter().print("3秒后自动刷新");
    }
}

2、jsp

<head>
    <title>Title</title>
    <%--通过meta配置自动刷新--%>
    <meta http-equiv="refresh" content="3;url=/login.html" >
</head>
<body>
<h2>error</h2>
<div>
    <%--<%=request.getAttribute("errormessage")%>--%>
    <%=request.getAttribute("message")%>
</div>
</body>