Question
Explain the difference between ForwardAction and IncludeAction
Answers
Forwarding to a specified URL is provided by the ForwardAction. The mechanism to include the specified URL contents is proveided by the IncludeAction.

ForwardAction is used to forward to a control from one page to another page / action. IncludeAction is used to include an action in another action.

ForwardAction is similar to < jsp:forward > and include action is similar to < jsp:include > tags of a JSP page.

ForwardAction IncludeAction
Forwards to the context-relative URI specified by the parameter property of the associated ActionMapping. Includes the context-relative URI specified by the parameter property of the associated ActionMapping.
An entry can be created as:

< action
path="/saveSubscription"
type="org.apache. struts.actions.ForwardAction"
name="subscriptionForm"
scope="request"
input="/subscription.jsp"
parameter="/path to processing servlet" />



To configure its use in the struts-config.xml file An entry can be created as:

< action
path="/saveSubscription"
type="org. apache. struts. actions.IncludeAction"
name="subscriptionForm"
scope="request"
input="/subscription.jsp"
parameter="/path to processing servlet" >



To configure its use in the struts-config.xml file
Steps to use ForwardAction:

Using the html:link tag with the action attribute, add a link to the JSP page that points to the action.

Create an Action Mapping in the Struts configuration file that uses the ForwardAction with the parameter attribute to specify the JSP path. Use the IncludeAction only if the action is going to be included by another action or JSP. Therefore, if we have code in our JSP that looks like this:

< jsp:include page="/someWebApp/ someModule/someAction.do " />


(a ForwardAction cannot be used here because it would forward control to the new action rather than including its output within the output of the JSP-or throw a nasty IllegalStateException if the output buffer was already committed.)   Your Comment




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