Java Reference
In-Depth Information
As you look over this tag, you will see that it first extends the BodyTagSupport class. This is
the helper class for tags with bodies. It provides default implementations for the methods
defined in the BodyTag interface.
The only difference from the HelloTag's doEndTag() method is the following code snippet:
// Get the content of this tag's body
String name = bodyContent.getString();
// We use the pageContext to get a Writer
// We then print the text string Hello + the content
// of the tag's body.
pageContext.getOut().print(“Hello “ + name);
In the HelloBodyTag's doEndTag() method you first get the String representation of the tag's
body using the bodyContent.getString() method. After you have this String you get a refer-
ence to a JspWriter that references the current stream being used for client response, as you
did in your HelloTag . You then use the print() method to write the text Hello string plus the
text value in the body of your HelloBodyTag to the response stream.
To see this tag in action you need to first compile the file and move the
class file into the <SERVER_ROOT>/webapps/djs/WEB-INF/classes/com/djs/ directory.
You then need to add the following code snippet to your tld :
<info>Just Says Hello to the Body</info>
The most important thing to notice in the above snippet is the bodycontent for this tag. It is
now JSP instead of empty . This tells the container that the tag body can have content and this
content can be JSP code.
Now you can see your new body tag in action. Listing 19.5 contains the source for the JSP that
will use your helloBody tag.
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