<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>Login</title>
</head>
<body>
错误信息：<h4 th:text="${msg}"></h4>
<form action="" method="post">
    <p>账号：<input type="text" name="username" value="long"/></p>
    <p>密码：<input type="text" name="password" value="123456"/></p>
     <p><input type="submit" value="登录"/></p>
</form>
</body>
</html>