JAF是什么？它的目的是什么？
我无法理解 JAF（Java 激活框架）的用途。请用简单的术语向我解释一下，或者向我指出信息。
Java Mail API 使用 JAF。看起来 JAF 是用来查找对象的支持数据类型的。但我无法理解。
请教我！
I am unable to understand the purpose of JAF (Java Activation Framework). Please explain it to me in simple terms, or point me towards information.
The Java Mail API is using JAF. It looks like the JAF is used to find the supporting data types of an object. But I couldn't understand.
Please teach me!
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JavaBeans Activation Framework 是一个库，用于抽象文件类型和处理它们的应用程序之间的操作系统特定绑定/映射。这可以基于 MIME 类型和/或文件扩展名。确实仅此而已。
打开 Windows 资源管理器并右键单击文件。可能存在各种操作（例如打开、编辑、播放）。与该文件关联的操作与 Windows 上的文件扩展名关联。 JAF 是它的便携式版本。它主要用于桌面应用程序能够与可与该计算机上的文件一起使用的任何程序进行交互。
The JavaBeans Activation Framework is a library for abstracting the operating system specific bindings/mappings between file types and applications that deal with them. This can be based on MIME types and/or file extensions. It's really nothing more than that.
Open up Windows explorer and right click on a file. Various actions may be there (eg Open, Edit, Play). What actions are associated with the file is associated with the file extension on Windows. JAF is a portable version of that. It's mainly intended for desktop applications to be able to interact with whatever programs can be used with files on that computer.
它实际上是 JavaBeans 激活框架，我认为 文档解释得很好：
您不清楚本段的哪些部分？
It's actually the JavaBeans Activation Framework and I think the docs explain it well:
What parts of this paragraph are not clear to you?
OT：有 JDK7中的类似功能（尽管当然不能被视为完全替代）
OT: there is similar functionality in JDK7 (although certainly cannot be considered as full replacement)