December 2003
Intermediate to advanced
764 pages
24h 58m
English
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Using the JSP Expression Language
The JSP Expression Language (EL) also
supports access to bean properties. Example 6-2
shows how an EL expression can be used to the same effect as the
<jsp:getProperty> action used in Example 6-1.
Example 6-2. Reading a bean property with the JSTL EL (cartoon2.jsp)
<html>
<head>
<title>A dose of Dilbert</title>
</head>
<body bgcolor="white">
<h1>A dose of Dilbert</h1>
<jsp:useBean id="cartoon"
class="com.ora.jsp.beans.motd.CartoonBean" />
<img src="images/${cartoon.fileName}">
</body>
</html>The bean created by the <jsp:useBean> action
can be used as a variable in an EL expression. The EL interprets a
name of a bean variable followed by a dot and a property name as a
request to get the value of the property from the bean. Here the
expression is used directly in the template text as part of the HTML
<img> element’s
src attribute value, retrieving the
fileName property value from the
carton bean when the JSP page is requested. Example 6-2 shows this notation in its simplest form, but
you can also access properties of properties by adding more elements
to the expression:
${someBean.aProperty.aPropertyOfTheProperty}In this case, the value of aProperty is a bean
that has a property named aPropertyOfTheProperty.
You can add as many property names as needed, without limit. Also
note that you can use this bean property syntax for any JSP action
attribute that permits EL expression values.
Whether to use <jsp:getProperty> or an EL expression to read a bean property ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.