Java/JSTL/Variable Scope
Версия от 18:01, 31 мая 2010; (обсуждение)
JSTL Set Variables Scope
<%@ 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="Page Level Value" scope="page" />
<c:set var="test" value="Request Level Value"
scope="request" />
<c:set var="test" value="Session Level Value"
scope="session" />
<c:set var="test" value="Application Level Value"
scope="application" />
<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="${applicationScope.test}" />
</td>
</tr>
</table>
</body>
</html>
Variable scope: page, session and application
<source lang="java">
//File: index.jsp <%@ taglib uri="http://java.sun.ru/jstl/core" prefix="c" %> <c:set var="scopeVarPage" value="Page Value" scope="page" /> <c:set var="scopeVarRequest" value="Request Value" scope="request" /> <c:set var="scopeVarSession" value="Session Value" scope="session" /> <c:set var="scopeVarApplication" value="Application Value" scope="application" /> <html>
<head> <title>Scope Example</title> </head> <body>
Main File: index.jsp
| Scoped Variable | Current Value |
|---|---|
Page Scope(scopeVarPage) |
<c:out value="${scopeVarPage}" />
|
Request Scope(scopeVarRequest) |
<c:out value="${scopeVarRequest}" />
|
Session Scope(scopeVarSession) |
<c:out value="${scopeVarSession}" />
|
Application Scope(applicationVarPage) |
<c:out value="${scopeVarApplication}" />
|
<jsp:include page="included.jsp" />
