为什么用户名不会使用以下代码显示在网页上？
String custId = (String) session.getAttribute("customerId");
String emailId = (String) session.getAttribute("emailId");
String phoneNumber = (String) session.getAttribute("phoneNumber");
<body>
<p> </p>
<p> </p>
<p> </p>
<p> </p>
<table width="70%" align="center" border="1">
<tr>
<td align="center">Welcome to Going Green !</td>
</tr
答案 0 :(得分：0)