# SessionServlet.jsp

    <!doctype html public "-//w3c/dtd HTML 4.0//en">
    <html>
    <!-- Copyright (c) 1999-2000 by BEA Systems, Inc. All Rights Reserved.-->
    <head>
    <title>Session Servlet</title>
    </head>

    <body bgcolor="#FFFFFF">
    <font face="Helvetica">

    <h2>
    <font color=#DB1260>
    Session Servlet
    </font>
    </h2>

    <p>
    This servlet demonstrates the use of HTTP sessions. You can add or delete
    named values to a session. The same session can be retrieved next time the
    user visits the page via a browser cookie. Use this form to see your additions
    and deletions at work. Check the code to see how adding and deleting session
    name/value pairs works.

    </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<br>

    </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>

    <%
      } // end of while loop for session names
    %>

    </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>Copyright (c) 1999-2000 by BEA Systems, Inc. All Rights Reserved.
    </font>

    </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;
    }

    %>