与web . xml(使用多个框架时需要编辑)不同，可以使用多个web - fragment . xml文件，这些文件共同组成web - xml部署描述符。

Unlike web.xml, which requires editing when using multiple frameworks, multiple web-fragment.xml files can be used which in aggregate constitute the web-xml deployment descriptor.

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例如，典型的读写操作可以在网络socket上执行(socket使用一个文件描述符表示，与一个普通文件一样)。

For example, typical read and write operations may be performed on a networking socket (which is represented by a file descriptor, just as a normal file).

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