Java Tutorial/JSTL/Page Context
Check Page Context Request Method
<%@ taglib uri="http://java.sun.ru/jstl/core" prefix="c" %>
<html>
<head>
<title>Property Access</title>
</head>
<body>
<c:if test="${pageContext.request.method=="POST"}">
<c:set var="idx" value="name" />
param.name =
<c:out value="${param.name}" />
<br />
param[name] =
<c:out value="${param[idx]}" />
<br />
</c:if>
<br />
<form method="post">Please enter your name?
<input type="text" name="name" />
<input type="Submit" />
<br />
</form>
</body>
</html>
Query String
<%@ taglib uri="http://java.sun.ru/jstl/core" prefix="c" %>
<html>
<head>
<title>Query String Example</title>
</head>
<body>Your favorite color is:
<b>
<c:out value="${param.color}" />
</b>
<br />
<br />
Choose your favorite color:
<br />
<br />
== Set Class to Page Context ==
<!-- start source code -->
<source lang="java">
<%@ taglib prefix="c" uri="http://java.sun.ru/jstl/core" %>
<%
synchronized (pageContext) {
Class thisClass = getClass();
// session.setAttribute("thisClass", thisClass);
pageContext.setAttribute("thisClass", thisClass, PageContext.PAGE_SCOPE);
System.out.println("Stored reference");
Class theClass = (Class) pageContext.getAttribute("thisClass", PageContext.PAGE_SCOPE);
System.out.println("The retrieved reference is " + theClass);
}
%>
<html>
<body>
The class that instantiated this JSP is <c:out value="${pageScope.thisClass.name}" />.
</body>
</html>
Set Variable to Page Context
<%@ taglib prefix="c" uri="http://java.sun.ru/jstl/core" %>
<%
synchronized (pageContext) {
String[] names = {"A", "B", "C", "D"};
pageContext.setAttribute("names", names, PageContext.PAGE_SCOPE);
}
%>
<html>
<head>
<title>forEach and status</title>
</head>
<body>
<c:forEach var="currentName" items="${pageScope.names}" varStatus="status">
Family member #<c:out value="${status.count}" /> is
<c:out value="${currentName}" /> <br />
</c:forEach>
</body>
</html>
