Java Tutorial/JSP/Session
Содержание
Get Session ID, creation time and last accessed time
<source lang="java">
<%@page import = "java.util.*" session="true"%> <HTML>
<HEAD>
<TITLE>Using Sessions to Track Users</TITLE>
</HEAD>
<BODY>
<%
Integer counter = (Integer)session.getAttribute("counter");
if (counter == null) {
counter = new Integer(1);
} else {
counter = new Integer(counter.intValue() + 1);
}
session.setAttribute("counter", counter);
%>
Using Sessions to Track Users
Session ID: <%=session.getId()%>
Session creation time: <%=new Date(session.getCreationTime())%>
Last accessed time: <%=new Date(session.getLastAccessedTime())%>
Number of times you"ve been here: <%=counter%>
</BODY>
</HTML></source>
Reference Session Value Across JSP Page
<source lang="java">
<html> <head>
<title>Session Example</title>
</head> <body> <%
String val = request.getParameter("name");
if (val != null)
session.setAttribute("name", val);
%>
Session Example
Where would you like to go?
Session Scope Bean
Counter.java
<source lang="java">
package beans; public class Counter {
private int counter = 0;
public void setCounter(int value)
{
this.counter = value;
}
public int getCounter()
{
return this.counter;
}
public Counter()
{
}
}</source>
Set and get variable to a session
<source lang="java">
<HTML>
<HEAD>
<TITLE>Using the Application Object</TITLE>
</HEAD>
<BODY>
Using the Application Object
<%
Integer counter = (Integer)session.getAttribute("counter");
String heading = null;
if (counter == null) {
counter = new Integer(1);
} else {
counter = new Integer(counter.intValue() + 1);
}
session.setAttribute("counter", counter);
Integer i = (Integer)application.getAttribute("i");
if (i == null) {
i = new Integer(1);
} else {
i = new Integer(i.intValue() + 1);
}
application.setAttribute("i", i);
%>
You have visited this page <%=counter%> times.
This page has been visited by all users <%=i%> times.
</BODY>
</HTML></source>
