GWT and Smart GWT
刚刚接触GWT,记录一下自己的问题：
1.今天把Smart GWT 和GWT-Ext弄混了，
我也注意到了下面：
GWT-Ext is no longer under active development and has been superseded by Smart GWT . Assistance will be provided to existing users of GWT-Ext looking to migrate to Smart GWT
但是下载时，下载了GWT-Ext 2.0.5 http://gwt-ext.com/download/ ，
以为它们会相互兼容呢，调试Smart GWT Showcase 提供的例子时，才发现，它们根本是两个完全不同的东西，费了好大劲才明白，哈，一直以为是版本不对呢。重新下载smartgwt-2.0 http://www.smartgwt.cn/
2.Smart GWT与GWT 整合
创建GWT Project(GwtProject),引入smartgwt.jar，smartgwt-skins.jar，
在GwtProject.gwt.xml(自动生成的)加入下面一行：<inherits name="com.smartgwt.SmartGwt"/>
编译后，会在war/gwtproject(自动创建)下生成sc目录，这目录下的东西我还没全明白，目前只用到了skins，
其它以后慢慢研究。
另外sc目录下有一个文件initsc.js，打开后发现if(!isomorphicDir){var isomorphicDir = "sc/";}，原来sc目录是可以变的。在GwtProject.html(自动生成)中可以添加变量< script > var isomorphicDir = "gwtproject/sc /" ; </ script >
Note:如果SC目录设置不符，会出现404 error.
3.GWT RPC(Remote Procedure Calls)
通过RPC，可以在client和server之间传递object对象。
the step of RPC:
1)Define an interface for your service that extends RemoteService and lists all your RPC methods.
2)Create a class that extends RemoteServiceServlet and implements the interface you created above.
3)Define an asynchronous interface to your service to be called from the client-side code.
@RemoteServiceRelativePath("stockPrices")
public interface StockPriceService extends RemoteService {
StockPrice[] getPrices(String[] symbols);
}
public class StockPriceServiceImpl extends RemoteServiceServlet implements StockPriceService {
//implemets the method StockPrice[] getPrices(String[] symbols);
}
public interface StockPriceServiceAsync {
void getPrices(String[] symbols, AsyncCallback<StockPrice[]> callback);
}
Note: @RemoteServiceRelativePath 指定default path relative to the module base URL.
StockPrice must be serializable.
4)在Web.xml中添加映射
<servlet>
<servlet-name>stockPriceServiceImpl</servlet-name>
<servlet-class>
com.google.gwt.sample.stockwatcher.server.StockPriceServiceImpl
</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>stockPriceServiceImpl</servlet-name>
<url-pattern>/stockwatcher /stockPrices </url-pattern>
</servlet-mapping>
//stockwatcher is set in StockWatcher.gwt.xml: <module rename-to='stockwatcher'>
//stockPrices is set by @RemoteServiceRelativePath
5)client调用：
// Initialize the service proxy.
StockPriceServiceAsync stockPriceSvc = GWT.create(StockPriceService.class);
// Set up the callback object.
AsyncCallback<StockPrice[]> callback = new AsyncCallback<StockPrice[]> () {
public void onFailure (Throwable caught) {
// TODO: Do something with errors.
}
public void onSuccess (StockPrice[] result) {
//TODO: Do something with success.
}
};
// Make the call to the stock price service.
stockPriceSvc.getPrices(stocks.toArray(new String[0]), callback);
4.Image URLs in Smart GWT
alignCenterButton.setSrc("icons/24/text_align_center.png");
war/images/icons/24/text_align_center.png
stretchButton.setIcon("[SKINIMG]/actions/search.png");
..\sc\skins\Enterprise\images\actions\search.png
imgButton.setSrc("[SKIN]/Window/minimize.png");
..\sc\skins\Enterprise\images\Window\search.png
[SKINIMG] 与 [SKIN]的区别，还不太清楚。