检测流是否用Java压缩的最佳方法 [英] Best way to detect if a stream is zipped in Java

问题描述

找出java.io.InputStream包含压缩数据的最佳方法是什么?

What is the best way to find out i java.io.InputStream contains zipped data?

推荐答案

魔术字节的ZIP格式为50 4B.您可以测试流(使用 mark 和重置-您可能需要缓冲区)，但是我不希望这是100％可靠的方法.无法将其与以字母PK开头的US-ASCII编码文本文件区分开.

The magic bytes for the ZIP format are 50 4B. You could test the stream (using mark and reset - you may need to buffer) but I wouldn't expect this to be a 100% reliable approach. There would be no way to distinguish it from a US-ASCII encoded text file that began with the letters PK.

最佳方法是在打开流之前，先以内容格式提供元数据，然后对其进行适当处理.

The best way would be to provide metadata on the content format prior to opening the stream and then treat it appropriately.

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