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Overview

The Spring Webflow plugin excerpt INLINE

integrates Spring Webflow (SWF) with Struts 2

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Features

• Allows Struts 2 to execute spring webflows
• Allows Struts 2 actions to be invoked by spring webflow.
• Includes an interceptor that injects flow scope properties into Struts 2 actions.
• Includes an annotation-based interceptor that injects flow scope properties into Struts 2 actions.
• SWF flow execution key can be managed in the session rather than as a hidden field on the client.

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Step 1 - Create your flow definition xml

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Step 2 - Configure Spring's applicationContext.xml

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The Struts2FlowAdapter allows a Struts 2 action to execute a webflow action-state. The Struts2FlowAdapter uses the id of the action state as the name of Struts 2 action to execute. The alwaysRedirectOnPause is disabled because whether to redirect or not is easier to control in the Struts 2 configuration files.

Step 3 - Add SWF interceptors to Struts's struts.xml configuration file

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The SessionFlowExecKeyInterceptor puts the flow execution key in the session rather than having it as a hidden field on the form that submitted back. The AnnotationFlowScopeInterceptor uses annotations to bind Struts 2 action variables to and from flow scope. Before an action executes, this interceptor looks for @FlowIn annotated properties of the Struts 2 action and populates the these actions from flow scope. After the action has executed, properties annotated with the @FlowOut annotation are put back into flow scope.

Step 4 - Configure the FlowAction so Spring Webflows can be executed

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For each view-state defined in the flow xml definition, there should be a corresponding result entry in the FlowAction definition. (Or a global result for that view-state)

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