Java Reference
In-Depth Information
To see this in action, open the included
header.jsp
and make some changes to it. Now reload
the
EmployeeInfo.jsp
. Your changes should take effect immediately. This is the difference
between the
include
directive and the
<jsp:include>
standard action. To propagate changes
using the
include
directive, you would have needed to restart the JSP engine. Using the
<jsp:include>
directive relieves you of this need.
The
<jsp:forward>
Standard Action
The
<jsp:forward>
action enables the JSP engine to dispatch, at runtime, the current request
to a static resource, servlet, or another JSP. The appearance of this action effectively terminates
the execution of the current page.
N
OTE
A
<jsp:forward>
action can contain
<jsp:param>
sub-attributes. These sub-attributes
provide values for parameters in the request to be used for forwarding.
The syntax of the
<jsp:forward>
action is as follows:
<jsp:forward page=”
relativeURLspec
” />
and
<jsp:forward page=
relativeURLspec
”>
<jsp:param .../>
</jsp:forward>
Table 16.7 contains the attribute and its description for the
<jsp:forward>
action.
T
ABLE
16.7
The Attribute for the
<jsp:forward>
Action
Attribute
Definition
This attribute represents the relative URL of the target of the forward.
page
The
<jsp:forward>
standard action is commonly used as a conditional in a JSP. In our example,
you will get the company
id
from the request and, based on it, you will use the
<jsp:forward>
to go to the employee's particular company page. Listing 16.5 contains the JSP that does this.
