如何查看InputStream中的前两个字节？ [英] How do I peek at the first two bytes in an InputStream?

问题描述

应该很简单：我有一个InputStream，我想偷看（不读取）前两个字节，即我希望在偷看之后，InputStream的当前位置为0。最好和最安全的方法是什么？

Should be pretty simple: I have an InputStream where I want to peek at (not read) the first two bytes, i.e. I want the "current position" of the InputStream to stil be at 0 after my peeking. What is the best and safest way to do this?

答案 - 正如我所怀疑的，解决方案是将其包装在BufferedInputStream中提供可标记性。谢谢Rasmus。

Answer - As I had suspected, the solution was to wrap it in a BufferedInputStream which offers markability. Thanks Rasmus.

推荐答案

对于一般的InputStream，我会将它包装在BufferedInputStream中，并执行以下操作：

For a general InputStream, I would wrap it in a BufferedInputStream and do something like this:

BufferedInputStream bis = new BufferedInputStream(inputStream);
bis.mark(2);
int byte1 = bis.read();
int byte2 = bis.read();
bis.reset();
// note: you must continue using the BufferedInputStream instead of the inputStream

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