如何确定我的OutputStream内部缓冲(How to determine my OutputStream internally buffered)

 OutputStream是一个抽象类，它包含一个flush()方法，根据javadoc不执行任何操作。 我知道flush（）方法用于推出保留在内部缓冲区中的任何内容。 我知道我需要使用flush（），如果我想确保我写入可能保存在内部缓冲区中的流的所有内容都被发送出去。 
 
 关键是这可能 。 我如何知道从API接收的流是否正在进行内部缓冲？ 如果api的javadoc未明确提及内部缓冲是否正在发生并因此建议使用flush（），该怎么办？ 如果我使用返回OutputStream的API并且我将字节写入此并且我想确保它们被发送，那么基于“以防它实际上确实有一个调用flush（）似乎是浪费内部缓冲区“。 

OutputStream is an abstract class that contains a flush() method that per the javadoc does nothing. I know that the flush() method is used to push out anything that is kept in internal buffers. I know that I need to use flush() if I want to make sure everything I've written to the stream that might be held in an internal buffer get sent out.
 
The key is this might. How do I know if the stream I receive from an API is doing internal buffering or not? What if the javadoc of the api does not mention explicitly if internal buffering is occurring and hence flush() is recommended? If I'm using an API that returns an OutputStream and I write bytes to this and I want to make sure they are sent, it seems like a waste to call flush() on the basis of "just in case it actually does have an internal buffer".

原文：https://stackoverflow.com/questions/45979550