The Finder controller handles any transaction-level logic and may call one or more business components for component-level logic
finder 控制器（finder controller）处理事务级逻辑，可能调用一个或多个用于组件级逻辑的业务组件。
A Finder Target Policy is quite similar to Query Target Policy except that there are no bound parameters for a find call.
查找定向策略与查询定向策略相似，只不过，这里没有find调用的绑定参数。
The finder services would then, in a single call, return the objects for all IDs given.
因而，finder服务将在一个调用中返回所有给定id的对象。
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