|
JSTL - Core Library
Part:
1
2
3
4
(Continued from previous part...)
c:forEach Action
<c:forEach var="name" items="expression"
begin="expression" end="expression" step="expression">
body
</c:forEach>
If the "items" attribute is specified, it will be used to identify an array or
collection object, the elements in the array or collection will be iterated.
At each iteration, the current element will assign to a named variable specified
in the "var" attribute, and body will be processed. If the "begin", "end" or "step"
attribute is specified, it will be used to restrict the beginning element,
the ending element, or the step size of the iteration.
If the "items" attribute is not specified, an index integer will be used to
iterate from the "begin" value to the "end" value stepping with the "step" value.
The c:forEach action serves similar purposes as the Java for statement. But there
is no break mechanism.
c:forTokens Action
<c:forTokens var="name" items="expression" delims="expression"
begin="expression" end="expression" step="expression">
body
</c:forTokens>
The string specified by the "items" attribute will be tokenized with
the delimiter specified by the "delims" attribute. Then resulting tokens
will be iterated. At each iteration, the current token will assign
to a named variable specified
in the "var" attribute, and body will be processed.
If the "begin", "end" or "step"
attribute is specified, it will be used to restrict the beginning element,
the ending element, or the step size of the iteration.
JSTL Core Example - JstlObjects.jsp
As my first JSTL core example, JstlObjects.jsp, is to use c:forEach to browse
through all the implicit objects, and c:forTekons to break the class path into
multiple items.
<?xml version="1.0"?>
<jsp:root xmlns:jsp="http://java.sun.com/JSP/Page"
xmlns:c="http://java.sun.com/jstl/core" version="1.2">
<!-- JstlObjects.jsp
Copyright (c) 2003 by Dr. Herong Yang
-->
<jsp:directive.page contentType="text/html"/>
<html><body>
<p>Browsing all the JSTL implicit objects:</p>
<p>"pageContext":</p>
<c:out value="${pageContext}"/><br/>
<p>"pageScope":</p>
<c:forEach items="${pageScope}" var="entry">
<c:out value="${entry}"/><br/>
</c:forEach>
<p>"requestScope":</p>
<c:forEach items="${requestScope}" var="entry">
<c:out value="${entry}"/><br/>
</c:forEach>
<p>"sessionScope":</p>
<c:forEach items="${sessionScope}" var="entry">
<c:out value="${entry}"/><br/>
</c:forEach>
<p>"applicationScope":</p>
<c:forEach items="${applicationScope}" var="entry">
<c:out value="${entry}"/><br/>
</c:forEach>
<p>"param":</p>
<c:forEach items="${param}" var="entry">
<c:out value="${entry}"/><br/>
</c:forEach>
<p>"paramValues":</p>
<c:forEach items="${paramValues}" var="entry">
<c:out value="${entry}"/><br/>
</c:forEach>
<p>"header":</p>
<c:forEach items="${header}" var="entry">
<c:out value="${entry}"/><br/>
</c:forEach>
<p>"headerValues":</p>
<c:forEach items="${headerValues}" var="entry">
<c:out value="${entry}"/><br/>
</c:forEach>
<p>"cookie":</p>
<c:forEach items="${cookie}" var="entry">
<c:out value="${entry}"/><br/>
</c:forEach>
<p>"initParam":</p>
<c:forEach items="${initParam}" var="entry">
<c:out value="${entry}"/><br/>
</c:forEach>
<p>Class path list:</p>
<c:forTokens
items="${applicationScope['org.apache.catalina.jsp_classpath']}"
delims=";" var="entry">
<c:out value="${entry}"/><br/>
</c:forTokens>
</body></html>
</jsp:root>
(Continued on next part...)
Part:
1
2
3
4
| 