Response

重定向

一个web资源收到客户端的请求后，他会通知客户端去访问另外一个web资源，这个过程叫做重定向。

常见场景

  1. 用户登录：void sendRedirect(String var1) throws IOException;

2.路径重定向：
注意：路径要写完全路径

package com.xin.servlet;

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

public class RedirectServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
	 //resp.setHeader("Location","/r/image");
//        resp.setStatus(302);
    resp.sendRedirect("/r/image");
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        doGet(req,resp);
    }
}

面试：重定向和转发的区别

相同：

  1. 页面都会跳转
    不同：
  2. 请求转发的时候url不会变化，重定向的时候url会发生变化

编写登录页面

<html>
<body>
<h2>Hello World!</h2>
<%@page contentType="text/html; charset=utf-8" %>
<%--提交的路径需要寻找到项目的路径--%>
<form action="${pageContext.request.contextPath}/login" method="get">
    用户名：<input type="text" name="username"><br>
    密码：<input type="password" name="password"><br>
    <input type="submit">
</form>

</body>
</html>

package com.xin.servlet;

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

public class RequestTest extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
    // resp.setContentType("text/html;charset=utf-8");
        System.out.println("进入这个请求");
        //处理请求
        String username = req.getParameter("username");
        String password = req.getParameter("password");
        System.out.println(username+":"+password);
        resp.sendRedirect("/r/success.jsp");

    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        doGet(req,resp);
    }
}

重定向

新建一个网页，使我们提交成功之后跳转

注意新建的jsp在webapp目录下

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>XIXI</title>
</head>
<body>
<h1>SUCCESS</h1>
</body>
</html>
posted @ 2025-09-03 16:18  xixixixin  阅读(9)  评论(0)    收藏  举报