Hi,
According to section 2.8 of the spec version 1.1 PR implicit objects
have different scopes, e.g. request has request scope and session has
session scope. But when I test this with jswdk-1.0 I get a different
result, all implicit objects have scope page. Any ideas?
I used the following simple JSP-page to determine the scope
<html><body>
<%@ page import="java.util.*" session="true"%>
<H1 align="center">Implicit Objects in JSP</H1>
<% pageContext.removeAttribute("javax.servlet.jsp.jspApplication"); %>
<%!
String table(int scope, PageContext pageContext) {
Enumeration e = pageContext.getAttributeNamesInScope(scope);
if (e == null || !e.hasMoreElements()) return "No Objects";
StringBuffer result = new StringBuffer();
result.append("<table BORDER=\"1\" CELLPADDING=\"3\" CELLSPACING=\"0\">");
result.append("<tr><th>Attribut</th><th>Class</th><th>Superclass</th>
<th>Interfaces</th></tr>");
for (;e.hasMoreElements(); ) {
String attName = (String) e.nextElement();
Object attValue = pageContext.getAttribute(attName, scope);
if (attValue != null) {
Class cl = attValue.getClass();
Class superCl = cl.getSuperclass();
Class[] interfaces = cl.getInterfaces();
result.append("<tr><td>" + attName + "</td><td>" + cl.getName()
+ "</td><td>" + superCl.getName() + "</td><td>");
if (interfaces.length == 0)
result.append(" ");
else {
for (int i = 0; i < interfaces.length-1; i++)
result.append(interfaces[i].getName() + ", ");
result.append(interfaces[interfaces.length-1].getName());
}
}
else
result.append("<tr><td>"+attName+"</td><td>no value</td><td> ");
result.append("</td></tr>");
}
result.append("</table>");
return result.toString();
}
%>
<br><%--<%@ include file="counter.jsp" %><br> <%= " 5%\\>x" %> --%>
<H2>Request Scope </H2>
<%= table(javax.servlet.jsp.PageContext.REQUEST_SCOPE, pageContext)%>
<H2>Page Scope </H2>
<%= table(javax.servlet.jsp.PageContext.PAGE_SCOPE, pageContext)%>
<H2>Session Scope </H2>
<%= table(javax.servlet.jsp.PageContext.SESSION_SCOPE, pageContext)%>
<H2>Application Scope </H2>
<%= table(javax.servlet.jsp.PageContext.APPLICATION_SCOPE, pageContext)%>
</body></html>
volker turau
FH Wiesbaden Fachbereich Informatik
Tel.: +49-611-9495-205 FAX +49-611-9495-210
http://www.informatik.fh-wiesbaden.de/~turau
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