August 2002
Intermediate to advanced
688 pages
23h
English
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Declaring a Bean in a JSP Page
Example 6-1 shows a JSP page that uses the bean described in Table 6-1 to display a cartoon strip.
Example 6-1. A page using a bean (cartoon.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/<jsp:getProperty name="cartoon"
property="fileName" />">
</body>
</html>Before you use a bean in a page, you must tell the JSP container
which type of bean it is and associate it with a name: in other
words, you must declare the bean. The first JSP action in Example 6-1, <jsp:useBean>, is
used for this purpose:
<jsp:useBean id="cartoon" class="com.ora.jsp.beans.motd.CartoonBean" />
The <jsp:useBean> action
is one of the JSP standard actions
(identified by the jsp prefix). The action creates
an instance of the bean class specified by the
class
attribute and associates it with the name specified by the
id attribute. The name must be unique in the page
and be a valid Java variable name: it must start with a letter and
can’t contain special characters such as dots, plus
signs, etc.
Other attributes you can specify for the
<jsp:useBean> action are
scope, type, and
beanName. Chapter 10 explores
how the scope attribute is used. The others are
rarely used, but Appendix A contains descriptions
of how you can use them if you wish.
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