gwt+spring整合

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目的：让gwt与spring整合

思路：建立一个实现了RemoteServiceServlet的servlet,根据传递的参数调用spring?WebApplicationContext容器里注册的服务，返回结果！

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实现：

1.建立一个实现了RemoteServiceServlet的servlet

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public class GwtSpring extends RemoteServiceServlet{

	/**
	 * spring容器上下文
	 */
	private WebApplicationContext springContext;

	/**
	 * 覆盖servlet.init方法 
	 * 获取spring WebApplicationContext容器上下文
	 */
	@Override
	public void init(ServletConfig config) throws ServletException {
		super.init(config);
		springContext = (WebApplicationContext) config.getServletContext().getAttribute( 
		WebApplicationContext.ROOT_WEB_APPLICATION_CONTEXT_ATTRIBUTE); 

		if (springContext == null) { 
			throw new RuntimeException("Check Your Web.Xml Setting, No Spring Context Configured"); 
		} 
	}
	
	/**
	 * 覆盖RemoteServiceServlet方法
	 * 获取调用参数，取得容器里的服务对象进行处理，返回处理结果
	 */
	@Override
	public String processCall(String payload) throws SerializationException {
		//获取HttpServletRequest对象
		HttpServletRequest req = getThreadLocalRequest();
		//获取服务对象，此处采用url比对，与servlet url-pattern配合
		//url样式：/gwtcrud/spring/*
		//*号代表容器里服务对象ID
		String requestURI = req.getRequestURI();
		String beanname = requestURI.substring(requestURI.lastIndexOf("/")+1);
		RemoteService service = (RemoteService) springContext.getBean(beanname);
		
		//调用服务对象，返回结果,参考：RemoteServiceServlet.processCall
		try {
			RPCRequest rpcRequest = RPC.decodeRequest(payload, service.getClass(),
					this);
			return RPC.invokeAndEncodeResponse(service, rpcRequest.getMethod(),
					rpcRequest.getParameters(), rpcRequest
							.getSerializationPolicy());
		} catch (IncompatibleRemoteServiceException ex) {
			getServletContext()
				.log("An IncompatibleRemoteServiceException was thrown while processing this call.",ex);
			return RPC.encodeResponseForFailure(null, ex);
		}
	}
	
	
}

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2.配置web.xml

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<servlet>
		<servlet-name>GwtSpring</servlet-name>
		<servlet-class>com.gwtcrud.server.GwtSpring</servlet-class>
</servlet>

<servlet-mapping>
		<servlet-name>GwtSpring</servlet-name>
		<url-pattern>/gwtcrud/spring/*</url-pattern>
</servlet-mapping>

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3.写远程接口

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/**
 * 调用spring容器中id为carService的对象
 * @author Administrator
 *
 */
@RemoteServiceRelativePath("spring/carService")
public interface CarService extends RemoteService{
	public Car getCar();
	public Car saveCar(Car car);
	public List<Car> getAllCars();
}

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