HttpServletResponse对象实现请求重定向(四)

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(一)请求重定向的概念

1.重定向是指当浏览器向Tomcat服务器发送请求时，由于一个Servlet1类无法完成所有请求响应工作，这时候Servlet1类会通知浏览器重新定向到另一个Servlet2类。浏览器再次发送请求Servlet2,来获得Servlet2的响应。

(二)使用HttpServletResponse对象实现请求重定向

1.代码演示

创建servlet实例

package com.haha;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;@WebServlet("/LoginDemo")public class LoginDemo extends HttpServlet {    private static final long serialVersionUID = 1L;    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {        response.setContentType("text/html;charset=utf-8");        String username=request.getParameter("username");        String password=request.getParameter("password");         if(("123").equals(username)&&("123").equals(password)){            response.sendRedirect("/ServletDemo/Welcome.html");        }else{            response.sendRedirect("/ServletDemo/login.html");        }    }    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {        doGet(request, response);    }}

配置Servlet对象

<?xml version="1.0" encoding="UTF-8"?><web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">  <display-name>ServletDemo</display-name>  <servlet>    <servlet-name>login</servlet-name>    <servlet-class>com.haha.LoginDemo</servlet-class>  </servlet>  <servlet-mapping>    <servlet-name>login</servlet-name>    <url-pattern>/wwwppp</url-pattern>  </servlet-mapping>  <welcome-file-list>    <welcome-file>index.html</welcome-file>    <welcome-file>index.htm</welcome-file>    <welcome-file>index.jsp</welcome-file>    <welcome-file>default.html</welcome-file>    <welcome-file>default.htm</welcome-file>    <welcome-file>default.jsp</welcome-file>  </welcome-file-list></web-app>

创建登录界面

<!DOCTYPE html><html><head><meta charset="UTF-8"><title>Insert title here</title></head><body><center> <form action="/ServletDemo/LoginDemo" method="get">   用户名：<input  type="text" name="username" /><br><br>    密&nbsp;&nbsp;&nbsp;&nbsp;码：<input  type="password" name="password"/><br><br><br>   <input type="submit"  value="登录">   &nbsp;&nbsp;&nbsp; <input type="reset"  value="重置"></form> </center></body></html>

创建欢迎界面

<!DOCTYPE html><html><head><meta charset="UTF-8"><title>Insert title here</title></head><body>欢迎来到魔鬼训练营</body></html>

2.输出结果

这里写图片描述

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