Gwt+struts

Howtouse

Install plugin

Copy the downloaded jar into the "WEB-INF/lib" folderCopy gwt-servlet.jar (from GWT) into the "WEB-INF/lib" folder

Setup Action

Start by creating an action that contains the method that is goingto be called. This method needs to match the signature of the serviceinterface, but you don't need to implement the interface on the action. Thismethod will be different from regular Struts 2 action methods in that itreturns any object (that GWT can serialize), instead of a result name. If youwant to call regular actions from GWT (not using GWT's RPC) go

here

In this example the action "Hello" will return thestring passed to it. Remember,

the returned object is not theregular Struts result, it is the object that you will receive on theclient side. The method can have any name.

Example:

public class Hello {

    public String execute(String text) {

        return text;

    }

}

Write the mapping for the action

For any action mapping that is going to be called from GWT:

Add the map inside a package that extends "gwt-default"Add the "gwt" interceptor to the mapping

Example:

<?xml version="1.0" encoding="UTF-8" ?>

<!DOCTYPE struts PUBLIC

    "-//Apache Software Foundation//DTD StrutsConfiguration 2.0//EN"

    "http://struts.apache.org/dtds/struts-2.0.dtd">

<struts>

 

<constant name="struts.enable.DynamicMethodInvocation" value="false" />

 

<constant name="struts.devMode"value="true" />

 

<package name="example" 

 

extends="gwt-default">

     <action name="Hello" class="example.Hello">

        <interceptor-ref name="gwt"/>

     </action>

 

</package>

</struts>

GWT classes

Write the required service interface as described

 

here. This is regular GWTstuff.

As an example of the interface:

public interface MyService extends RemoteService {

    public String execute(String s);

}

public interface MyServiceAsync {

    public void execute(String s, AsyncCallback callback);

}

And to call it:

MyServiceAsync service = (MyServiceAsync) GWT.create(MyService.class);

AsyncCallback callback = new AsyncCallback() {

    public void onSuccess(Object result) {

        Window.alert(result.toString());

    }

    public void onFailure(Throwable caught) {

        Window.alert(caught.toString());

    }

};

ServiceDefTargetendpoint = (ServiceDefTarget) service;

endpoint.setServiceEntryPoint("Hello.action");

service.execute("Hello", callback);

 

源文档 <http://code.google.com/p/struts2gwtplugin/wiki/Howtouse>