Spring Web Flow：将视图状态ID附加到URL

Question

I am using spring web flow 2.x and is trying to append the view state id to the URL. I want to save the view state id to request scope and append it to URL everytime user clicks 'next' or 'previous'. Is this possible using a Custom Flow URL handler?

How do I get the view state Id inside my Custom/Pretty flow Url handler?

Answer 1

Write an on-entry action in the view and retrieve current state id by RequestContext.

<view-state id="currentView" view="currentView" model="modelObject">
    <on-entry>
        <evaluate expression="yourObject.methodName(flowRequestContext, flowScope.modelObject)"/>
    </on-entry>
    <transition on="previous" to="someStateOrView"/>
    <transition on="next" to="someStateOrView"/>
 </view-state>      

 public class YourObject{
...
public void methodName(RequestContext requestContext, ModelObject model){
    model.setPreviousView(requestContext.getCurentState().getId());
    ....
}
 }

Get the previousView value from your model and append it to your url as this will be set the moment flow enters into this view.