@Target(value=METHOD) @Retention(value=RUNTIME) @Documented public @interface WebEndpoint
getPortName()方法。 
        在此注释所指定的信息足以唯一地识别wsdl:port一个内部元件wsdl:service 。 后者是基于的值确定WebServiceClient注释生成的服务接口本身上。 
WebServiceClient 
       public abstract String name
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