Java套接字是否支持全双工？ [英] Do Java sockets support full duplex?

问题描述

是否可以让一个线程写入Java Socket 的 OutputStream ，而另一个线程则从socket的 InputStream ，没有线程必须在套接字上同步？

Is it possible to have one thread write to the OutputStream of a Java Socket, while another reads from the socket's InputStream, without the threads having to synchronize on the socket?

推荐答案

确定。你所描述的确切情况应该不是问题（同时读写）。

Sure. The exact situation you're describing shouldn't be a problem (reading and writing simultaneously).

一般来说，如果没有什么可读的话，读取线程会阻塞，并且可能如果指定了超时，则读取操作超时。

Generally, the reading thread will block if there's nothing to read, and might timeout on the read operation if you've got a timeout specified.

由于输入流和输出流是Socket中的单独对象，因此您可能只关注它你自己是，如果有2个线程同时尝试读取或写入（两个线程，相同的输入/输出流）会发生什么？ InputStream / OutputStream类的读/写方法不同步。但是，如果您使用的是InputStream / OutputStream的子类，则可能会同步您正在调用的读/写方法。您可以查看javadoc以查找您正在调用的任何类/方法，并快速找到它。

Since the input stream and the output stream are separate objects within the Socket, the only thing you might concern yourself with is, what happens if you had 2 threads trying to read or write (two threads, same input/output stream) at the same time? The read/write methods of the InputStream/OutputStream classes are not synchronized. It is possible, however, that if you're using a sub-class of InputStream/OutputStream, that the reading/writing methods you're calling are synchronized. You can check the javadoc for whatever class/methods you're calling, and find that out pretty quick.

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