📄 session(other).jsp
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<!doc type html public "-//w3c/dtd HTML 4.0//en">
<html>
<!-10.22,2000 by JSPers.-->
<head>
<title>Session Servlet</title>
</head>
<body bgcolor="#FFFFFF">
<font face="Helvetica">
<h2>
<font color=#DB1260>
Session Servlet
</font>
</h2>
<p>
这个Servlet描述了HTTP session对象的使用。你可以添加或者删除已经命名了的values到一个session对象里面。当下次用户（有Cookies的）访问该页时，同一个session能够被重新被获取。这里是用表单来查看你的增加或者删除。
</p>
<%
if (request.getParameter("AddValue") != null) {
session.setAttribute(addPrefix(request.getParameter("NameField")),
request.getParameter("ValueField"));
}
else if (request.getParameter("DeleteValue") != null) {
session.removeAttribute(addPrefix(request.getParameter("NameField")));
}
%>
<center>
<table border=1 cellspacing=2 cellpadding=5 width=400 bgcolor=#EEEEEE>
<th colspan=2>Session</th>
<tr>
<td><B>Name</B></td>
<td><B>Value</B></td>
</tr>
<%
Enumeration sessionNames = session.getAttributeNames();
String name;
while (sessionNames.hasMoreElements())
{
name = (String)sessionNames.nextElement();
%>
<tr>
<td><%= removePrefix(name) %></td>
<td><%= (String)session.getAttribute(name) %></td>
</tr>
<%
}
// 结束判断session对象名称的循环
%>
</table>
</center>
<p>
<form method="post" name="SessionServlet" action="SessionServlet.jsp">
<center>
<table border=0 cellspacing=2 cellpadding=5 width=400>
<th>Name to add/delete</th>
<th>Value</th>
<tr>
<td><input type="text" name="NameField"></td>
<td><input type="text" name="ValueField"></td>
</tr>
<tr>
<td colspan=2 align=center>
<input type="submit" value="Add" name="AddValue"></td>
</tr>
<tr>
<td colspan=2 align=center>
<input type="submit" value="Delete" name="DeleteValue"></td>
</tr>
</table>
</center>
</form>
<p>
<font size=-1>JSP小组开发</font>
</body>
</html>
<%!
static final String PREFIX_LABEL="SessionServlet.";
private String removePrefix(String name)
{
if (name.startsWith(PREFIX_LABEL))
name = name.substring(PREFIX_LABEL.length());
return name;
}
private String addPrefix(String name)
{
if (!name.startsWith(PREFIX_LABEL))
name = PREFIX_LABEL + name;
return name;
}
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