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Beans scopes in JSP
The following example will demonstrate the various bean scopes for the JSP application. All the examples will use the Counter bean which has only one property counter of type int .
(1) Page Scope
Note:- This is the default scope for the bean object. So in the following JSP example "bean1" is accessed only in this page and not anywhere else.
<HTML>
<BODY>
<H1>Using Beans and Page Scope</H1>
<jsp:useBean id="bean1" class="com.visualbuilder.Counter" scope="page" />
<%bean1.setCounter(bean1.getCounter() + 1);%>
The counter value is: <jsp:getProperty name="bean1" property="counter" />
</BODY>
</HTML>
(1) Request Scope
index.jsp
<jsp:useBean id="counter" scope="request" class="com.visualbuilder.Counter" />
<html>
<head>
<title>Request Bean Example</title>
</head>
<body>
<%
counter.setCounter(10);
%>
<jsp:forward page="request.jsp" />
</body>
</html>
request.jsp
<jsp:useBean id="counter" scope="request" class="com.visualbuilder.Counter" />
<html>
<body>
<H3>Request Bean Example</H3>
<center><b>The current count for the counter bean is: </b>
<%=counter.getCounter() %></center>
</body>
</html>
(3) Session Scope
Example for Session Scope.
<HTML>
<BODY>
<jsp:useBean id="bean1" class="com.visualbuilder.Counter" scope="session" />
<%bean1.setCounter(bean1.getCounter() + 1);%>
The counter value is:
<jsp:getProperty name="bean1" property="counter" />
</BODY>
</HTML>
(3) Application Scope
<jsp:useBean id="counter" scope="application" class="com.visualbuilder.Counter" />
<html>
<body>
<center>
<b>The current count for the counter bean is: </b> <%=counter.getCounter() %>
</center>
</body>
</html>
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