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Example action:

Code Block

	JAVA
	JAVA
title	"Hello.java"JAVA

package example;

import com.opensymphony.xwork2.Action;

public class Hello {
    private String firstName;
    private String lastName;

    public String execute() {
        return Action.SUCCESS;
    }

    public String getFirstName() {
        return firstName;
    }
    public void setFirstName(String firstName) {
        this.firstName = firstName;
    }
    public String getLastName() {
        return lastName;
    }
    public void setLastName(String lastName) {
        this.lastName = lastName;
    }
}

...

In this example the mapping is in struts.xml:

Code Block

	XML
	XML
title	struts.xmlXML

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
    "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
    "http://struts.apache.org/dtds/struts-2.0.dtd">

<struts>

  <package name="example"  extends="json-default">
    <action name="Hello" class="example.Hello">
      <result type="json" />
    </action>

    <action name="Main" class="com.opensymphony.xwork2.ActionSupport">
      <result>org.apache.struts.gwt.Main/Main.jsp</result>
    </action>
  </package>

</struts>

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This is the page that is generated by GWT's "applicationCreator". It has been renamed to .jsp because we have modified it to be a jsp page, instead of a plain html page.

Code Block

	HTML
	HTML
title	Main.jspHTML

<%@ taglib prefix="s" uri="/struts-tags" %>
<html>
  <head>
    <s:head theme="ajax" debug="true"/>
    <meta name='gwt:module' content='org.apache.struts.gwt.Main/org.apache.struts.gwt.Main'>
  </head>

  <body>
    <script language="javascript" src="${pageContext.request.contextPath}/org.apache.struts.gwt.Main/gwt.js"/>

      <form id="form1">
         <input type="text" name="firstName">
          <br/>
          <input type="text" name="lastName">
          <span id="slot1"></span>
       </form>

       <br/>
       <span id="slot2"></span>
  </body>
</html>

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and add the jar to the classpath in your compile script (i.e Main-compile.cmd) and the compile script (i.e Main-shell.cmd).

Code Block

	JAVA
	JAVA
title	Struts2GWTHelper .javaJAVA

package org.apache.struts.gwt.client;

import com.google.gwt.user.client.ResponseTextHandler;

public class Struts2GWTHelper {

    /**
     * Make asynchronous post
     * @param url Action url
     * @param formId id of form that will be posted
     * @param handler callback function
     */
    public static native void asyncPost(String url, String formId, ResponseTextHandler handler) /*-{
        dojo = $wnd.dojo;
        //don't use the dojo.io.bind({...}) shortcut, it doesn't work here
        var request = new dojo.io.Request(url);
        request.load = function(type, data, request) {
            handler.@com.google.gwt.user.client.ResponseTextHandler::onCompletion(Ljava/lang/String;)(data);
        };
        request.formNode = dojo.byId(formId);
        request.method = "POST";
        $wnd.dojo.io.bind(request);
    }-*/;

    /**
     * Make asynchronous post
     * @param url Action url
     * @param handler callback function
     */
    public static void asyncPost(String url, ResponseTextHandler handler) {
        Struts2GWTHelper.asyncPost(url, handler);
    }
}

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Write your GWT entry point

Code Block

	JAVA
	JAVA
title	Main.javaJAVA

package org.apache.struts.gwt.client;

import com.google.gwt.core.client.EntryPoint;
import com.google.gwt.json.client.JSONObject;
import com.google.gwt.json.client.JSONParser;
import com.google.gwt.json.client.JSONString;
import com.google.gwt.user.client.ResponseTextHandler;
import com.google.gwt.user.client.ui.Button;
import com.google.gwt.user.client.ui.ClickListener;
import com.google.gwt.user.client.ui.Label;
import com.google.gwt.user.client.ui.RootPanel;
import com.google.gwt.user.client.ui.Widget;

/**
 * Entry point classes define <code>onModuleLoad()</code>.
 */
public class Main implements EntryPoint {
    final Label label = new Label();

    /**
     * This is the entry point method.
     */
    public void onModuleLoad() {
        final Button button = new Button("Click me");

        button.addClickListener(new ClickListener() {
            public void onClick(Widget sender) {
                makeRequest();
            }
        });

        RootPanel.get("slot1").add(button);
        RootPanel.get("slot2").add(label);
    }

    private void makeRequest() {
        Struts2GWTHelper.asyncPost("Hello.action", "form1", new ResponseTextHandler() {
            public void onCompletion(String responseText) {
                JSONObject obj = (JSONObject)JSONParser.parse(responseText);
                JSONString firstName = (JSONString)obj.get("firstName");
                JSONString lastName = (JSONString)obj.get("lastName");
                label.setText("Welcome " + firstName.stringValue() + " " + lastName.stringValue());
            }
        });
    }
}

...

Nothing new on this file, just as reference:

Code Block

	XML
	XML
title	Main.gwt.xmlXML

<module>

    <!-- Inherit the core Web Toolkit stuff.                  -->
    <inherits name='com.google.gwt.user.User'/>
    <inherits name='com.google.gwt.json.JSON'/>

    <!-- Specify the app entry point class.                   -->
    <entry-point class='org.apache.struts.gwt.client.Main'/>

</module>

...

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Write your GWT entry point