Java Reference
In-Depth Information
The interface provides one field and three new methods. The first is to be invoked with the
BodyContent
for the evaluation of the body; the second is to be reevaluated after every body
evaluation.
The
EVAL_BODY_TAG
Field
public static final int EVAL_BODY_TAG
This field requests the creation of new
BodyContent
on which to evaluate the body of this tag.
It is returned from
doStartTag
and
doAfterBody
. This is an illegal return value for
doStartTag
when the class does not implement
BodyTag
, because
BodyTag
is needed to manip-
ulate the new
Writer
.
The
setBodyContent()
Method
public void setBodyContent(BodyContent b)
This method is used by the JSP engine to set the body content of the tag. It returns no value
and throws no exceptions.
It takes one parameter:
•
BodyContent
The
doInitBody()
Method
public void doInitBody() throws JspException
The method will be invoked once per action invocation by the page implementation. It's
invoked after a new
BodyContent
has been obtained and set on the tag handler through the
setBodyContent()
method and before the evaluation of the tag's body into that
BodyContent
.
It has no parameters and returns no value.
E
It throws this exception:
•
JspException
The
doAfterBody()
Method
public int doAfterBody() throws JspException
The
doAfterBody()
method is executed after some body has been evaluated. It is not invoked
in empty tags or in tags returning
SKIP_BODY
in
doStartTag()
. It has no parameters and
returns no value.
It throws this exception:
•
JspException
