首先声明服务的接口，如清单4所示。
Start off by declaring an interface for the service, as shown in Listing 4.
首先要声明服务接口，如清单 2 所示。
So you'll declare your service interface, as shown in Listing 2.
组件供应商必须在部署描述符中声明所有的服务引用。
The component provider must declare all the service references in the deployment descriptor.
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