August 2002
Intermediate to advanced
688 pages
23h
English
Content preview from JavaServer Pages, Second Edition
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Setting Bean Properties
If a bean property
is writable (write-only or read/write access), you can set the value
using another standard action:
<jsp:setProperty>. Table 6-2 shows a bean that is similar to the
CartoonBean used in the previous example, but that
also has a writable property named category.
Table 6-2. Properties for com.ora.jsp.beans.motd.MixedMessageBean
|
Property name |
Java type |
Access |
Description |
|---|---|---|---|
category |
String |
Write |
The message category, either thoughts or quotes |
message |
String |
Read |
The current message in the selected category |
Instead of image files, the MixedMessageBean has a
property that contains a funny message (funny to me at least -- I
hope you agree). The bean maintains messages of different types, and
the write-only category property is used to select
the type you want. Example 6-3 shows how you can use
this feature.
Example 6-3. A page setting a bean property (message.jsp)
<html>
<head>
<title>Messages of the Day</title>
</head>
<body bgcolor="white">
<h1>Messages of the Day</h1>
<jsp:useBean id="msg"
class="com.ora.jsp.beans.motd.MixedMessageBean" />
<h2>Deep Thoughts - by Jack Handey</h2>
<jsp:setProperty name="msg" property="category"
value="thoughts" />
<i>
<jsp:getProperty name="msg" property="message" />
</i>
<h2>Quotes From the Famous and the Unknown</h2>
<jsp:setProperty name="msg" property="category"
value="quotes" />
<i>
<jsp:getProperty name="msg" property="message" />
</i>
</body>
</html>As in the previous example, the
<jsp:useBean> ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
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.