这些扩展模块让你能想干什么就干什么：调用图形库、数据流库，还能操作各种数据格式。
The extension modules let you do all sorts of things: communicate with graphics libraries, data flow libraries, and all sorts of file formats.
切换文件扩展名就行，而且，如果有特定的方法支持它，那么就获得了新格式化的数据流。
Simply switch the filename extension, and, if the particular method supports it, you get a newly formatted data stream.
JSON 4 J可被用来将数据格式化为一个JSON数据流，它之后再被返回给客户机。
JSON4J can be used to format the data into a JSON data stream, which is then returned back to the client.
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