Java Tutorial/JSTL/Session

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Get HTTP Session by using JSTL

<%@ taglib uri="http://java.sun.ru/jstl/core" prefix="c" %>
<html>
  <head>
    <title>Page Data Example</title>
  </head>
  <body>
    <h3>&#160;</h3>
    <table border="1" width="539">
      <tr>
        <td colspan="2" width="529" bgcolor="#0000FF">
          <b>
            <font color="#FFFFFF" size="4">HTTP
            Session(pageContext.session.)</font>
          </b>
        </td>
      </tr>
      <tr>
        <td width="210">Creation Time</td>
        <td width="313">&#160; 
        <c:out value="${pageContext.session.creationTime}" />
        </td>
      </tr>
      <tr>
        <td width="210">Session ID</td>
        <td width="313">&#160; 
        <c:out value="${pageContext.session.id}" />
        </td>
      </tr>
      <tr>
        <td width="210">Last Accessed Time</td>
        <td width="313">&#160; 
        <c:out value="${pageContext.session.lastAccessedTime}" />
        </td>
      </tr>
      <tr>
        <td width="210">Max Inactive Interval</td>
        <td width="313">&#160; 
        <c:out
        value="${pageContext.session.maxInactiveInterval}" />
        seconds</td>
      </tr>
      <tr>
        <td width="210">You have been on-line for</td>
        <td width="313">&#160; 
        <c:out
        value="${(pageContext.session.lastAccessedTime-pageContext.session.creationTime)/1000}" />
        seconds</td>
      </tr>
    </table>
  </body>
</html>





Remove Attribute From Session

<%@ taglib uri="http://java.sun.ru/jstl/core" prefix="c" %>
<c:set var="userName" value="Mark" scope="session" />
<html>
  <head>
    <title>Chapter 5 - Set a scoped attribute</title>
  </head>
  <body>
    This page sets a session-scoped attribute that is removed
    by 



==  Set Variable Scope to Session ==






   
  <!-- start source code -->
   
    <source lang="java">
<%@ taglib uri="http://java.sun.ru/jstl/core" prefix="c" %>
<html>
  <head>
    <title>Set in Scope Examples</title>
  </head>
  <body>
    <c:set var="test" value="Session Level Value" scope="session" />
    <table border="1">
    <tr>
        <td>
          <b>Default Level</b>
        </td>
        <td>
          <c:out value="${test}" />
        </td>
      </tr>
      <tr>
        <td>
          <b>Page Level</b>
        </td>
        <td>
          <c:out value="${pageScope.test}" />
        </td>
      </tr>
      <tr>
        <td>
          <b>Request Level</b>
        </td>
        <td>
          <c:out value="${requestScope.test}" />
        </td>
      </tr>
      <tr>
        <td>
          <b>Session Level</b>
        </td>
        <td>
          <c:out value="${sessionScope.test}" />
        </td>
      </tr>
      <tr>
        <td>
          <b>Application Level</b>
        </td>
        <td>
          <c:out value="${applicationScope.test}" />
        </td>
      </tr>
    </table>
  </body>
</html>





Update Session Date using JSTL

<%@page contentType="text/html"%>
<%@ taglib uri="http://java.sun.ru/jstl/core" prefix="c" %>
<%@ taglib uri="http://java.sun.ru/jstl/fmt" prefix="fmt" %>
<html>
<head><title>View Session JSP </title></head>
<body>
<h2>Session Info From A JSP</h2>
The session id: <c:out value="${pageContext.session.id}"/>
<h3>Session date values formatted as Dates</h3>
<jsp:useBean id="timeValues" class="java.util.Date"/>
<c:set target="${timeValues}" value="${pageContext.session.creationTime}" property="time"/>
The creation time: <fmt:formatDate value="${timeValues}" type="both" dateStyle="medium" /><br><br>
<c:set target="${timeValues}" value="${pageContext.session.lastAccessedTime}" property="time"/>
The last accessed time:  <fmt:formatDate value="${timeValues}" type="both" dateStyle="short" />
<c:out value="${timeValues}"/>
</body>
</html>





Use JSTL to Deal with Session

<%@ taglib uri="http://java.sun.ru/jstl/core" prefix="c" %>
<c:if test="${pageContext.request.method=="POST"}">
  <c:set var="uid" value="${param.uid}" scope="session" />
  <jsp:forward page="session2.jsp" />
</c:if>
<html>
  <head>
  </head>
  <body>
    <form method="POST">
      <table border="1" cellpadding="0" cellspacing="0"
      style="border-collapse: collapse" bordercolor="#111111"
      width="42%" id="AutoNumber1">
        <tr>
          <td width="100%" colspan="2" bgcolor="#0000FF">
            <p align="center">
              <b>
                <font size="4" color="#FFFFFF">Please Login</font>
              </b>
            </p>
          </td>
        </tr>
        <tr>
          <td width="19%">User Name</td>
          <td width="81%">
            <input type="text" name="uid" size="20" />
          </td>
        </tr>
        <tr>
          <td width="19%">Password</td>
          <td width="81%">
            <input type="password" name="pwd" size="20" />
          </td>
        </tr>
        <tr>
          <td width="100%" colspan="2">
            <p align="center">
              <input type="submit" value="Submit" name="action" />
              <input type="reset" value="Reset" name="B2" />
            </p>
          </td>
        </tr>
      </table>
    </form>
    <p align="left">
      <i>Note: you may use any ID/Password, security is not
      checked.</i>
    </p>
  </body>
</html>





View Session Date using JSTL

<%@page contentType="text/html"%>
<%@ taglib uri="http://java.sun.ru/jstl/core" prefix="c" %>
<%@ taglib uri="http://java.sun.ru/jstl/fmt" prefix="fmt" %>
<html>
<head><title>View Session JSP </title></head>
<body>
<h2>Session Info From A JSP</h2>
The session id: <c:out value="${pageContext.session.id}"/><br><br>
The session creation time as a long value: <c:out value="${pageContext.session.creationTime}"/><br><br>
The last accessed time as a long value: <c:out value="${pageContext.session.lastAccessedTime}"/><br><br>
</body>
</html>


Источник — «http://jexp.ru/index.php?title=Java_Tutorial/JSTL/Session&oldid=3414»