这节课我们来做个登录功能
login.jsp:
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>登录</title>
</head>
<body style="text-align: center">
<form style="margin-top: 100px;border: 1px solid black;text-align: center" action="/login" method="post">
<input type="text" name="username" placeholder="用户名"><br><br>
<input type="password" name="password" placeholder="密码"><br><br>
<button type="submit">登录</button>
</form>
</body>
</html>
login_success.jsp:
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>登录</title>
</head>
<body style="text-align: center">
<form style="margin-top: 100px;border: 1px solid black;text-align: center" action="/login" method="post">
<input type="text" name="username" placeholder="用户名"><br><br>
<input type="password" name="password" placeholder="密码"><br><br>
<button type="submit">登录</button>
</form>
</body>
</html>
web.xml
<?xml version="1.0" encoding="UTF-8"?>
<!--web-app 是整个web.xml的根标签，所有的配置都必须写在web-app里-->
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
version="4.0">
<!--
welcome-file 设置欢迎页
可以看到欢迎页面设置成功
-->
<welcome-file-list>
<welcome-file>/WEB-INF/login.jsp</welcome-file>
</welcome-file-list>
<!--配置LoginServlet与/login请求映射-->
<servlet>
<servlet-name>LoginServlet</servlet-name>
<servlet-class>com.login.LoginServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>LoginServlet</servlet-name>
<url-pattern>/login</url-pattern>
</servlet-mapping>
</web-app>
LoginServlet.java:
package com.login;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
//这个servlet用来处理登录请求
public class LoginServlet extends HttpServlet {
String username = "xiaoye";
String password = "123456";
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
String username = req.getParameter("username");
String password = req.getParameter("password");
if (this.username.equals(username) && this.password.equals(password))
{
//跳转到登录成功的页面
/**
* 跳转页面使用request.getRequestDispatcher(要跳转的页面的路径).forward(request,response);
*/
req.getRequestDispatcher("/WEB-INF/login_success.jsp").forward(req,resp);
//OK，成功了
}
}
}
