Like JDBC, JMS is a low level API requiring you to create and manage multiple intermediary objects even for the most basic of JMS tasks.

像JDBC一样，JMS是一个底层api，它需要你为JMS的绝大部分基础任务来创建并管理中间对象。

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All of the examples here assume that ultimately you'll be using the formatting objects as an intermediary to achieve a conversion to PDF.

这里的所有示例都假定您最终将使用格式化对象作为实现至pdf转换的中间产物。

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Suppose that you wanted to isolate a subsystem, so that client code would have to go through an intermediary to access worker objects (this situation occurs in the Facade design pattern).

假如您希望隔离一个子系统，以使客户机代码必须通过中间媒介来访问工作程序对象(这种情况在Facade设计模式中出现)。

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