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GWT-Ext is no longer under active development and has been superseded by Smart GWT .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。

评论

2 楼 jelver 2010-04-10  

怎么不能编辑回复呢，郁闷，
不过我在直接修改html没有用，只好直接修改initsc.js

1 楼 jelver 2010-04-10  

非常感谢您的这段提示：

  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.

默认的的确有点问题，我用smartgwt2.1版本也碰到这个问题，多谢