December 2003
Intermediate to advanced
764 pages
24h 58m
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 the
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 Acontains descriptions of how you can use
them if you wish.
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