版权声明：本文为蔡俊锋博主原创文章，未经蔡俊锋博主允许不得转载。 https://blog.csdn.net/caijunfen/article/details/81745827
登录页面居中示例代码
<html>
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>用户登录</title>
<!-- Bootstrap 核心 CSS 文件 -->
<link rel="stylesheet" href="https://cdn.bootcss.com/bootstrap/3.3.5/css/bootstrap.min.css">
<style>
/*web background*/
.container{
display:table;
height:100%;
}
.row{
display: table-cell;
vertical-align: middle;
}
/* centered columns styles */
.row-centered {
text-align:center;
}
.col-centered {
display:inline-block;
float:none;
text-align:left;
margin-right:-4px;
}
</style>
</head>
<body>
<div class="container">
<div class="row row-centered">
<div class="well col-md-6 col-centered">
<h2>欢迎登录</h2>
<form:form action="/login" method="post" role="form">
<div class="input-group input-group-md">
<span class="input-group-addon" id="sizing-addon1"><i class="glyphicon glyphicon-user" aria-hidden="true"></i></span>
<input type="text" class="form-control" id="userid" name="userid" placeholder="请输入用户ID"/>
</div>
<div class="input-group input-group-md">
<span class="input-group-addon" id="sizing-addon1"><i class="glyphicon glyphicon-lock"></i></span>
<input type="password" class="form-control" id="password" name="password" placeholder="请输入密码"/>
</div>
<br/>
<button type="submit" class="btn btn-success btn-block">登录</button>
</form:form>
</div>
</div>
</div>
<!-- jQuery文件。务必在bootstrap.min.js 之前引入 -->
<!-- <script src="//cdn.bootcss.com/jquery/1.11.3/jquery.min.js"></script> -->
<script src="https://cdn.bootcss.com/jquery/3.3.1/jquery.min.js"></script>
<!-- 最新的 Bootstrap 核心 JavaScript 文件 -->
<script src="https://cdn.bootcss.com/bootstrap/3.3.5/js/bootstrap.min.js"></script>
</body>
</html>