Java Tutorial/JSTL/Page Context
Содержание
Check Page Context Request Method
<source lang="java">
<%@ 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}" />
param[name] =
<c:out value="${param[idx]}" />
</c:if>
<form method="post">Please enter your name?
<input type="text" name="name" />
<input type="Submit" />
</form>
</body>
</html></source>
Query String
<source lang="java">
<%@ taglib uri="http://java.sun.ru/jstl/core" prefix="c" %> <html>
<head>
<title>Query String Example</title>
</head>
<body>Your favorite color is:
<c:out value="${param.color}" />
Choose your favorite color:
Set Class to Page Context
<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="${pageScope.thisClass.name}" />.
</body>
</html></source>
Set Variable to Page Context
<source lang="java">
<%@ taglib prefix="c" uri="http://java.sun.ru/jstl/core" %> <%
synchronized (pageContext) {
String[] names = {"A", "B", "C", "D"};
pageContext.setAttribute("names", names, PageContext.PAGE_SCOPE);
}
%> <html>
<head>
<title>forEach and status</title>
</head>
<body>
<c:forEach var="currentName" items="${pageScope.names}" varStatus="status">
Family member #<c:out value="${status.count}" /> is
<c:out value="${currentName}" />
</c:forEach>
</body>
</html></source>
