basePath

<html>
<%
    String path = request.getContextPath();
    String basePath = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + path + "/";
%>
<head>
    <meta http-equiv="Refresh" content="0; URL=<%=basePath%>admin/login">
</head>
<body>
</body>
</html>
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原文地址：https://www.cnblogs.com/CESC4/p/7325829.html