如何异步读取stdin？ [英] How to asynchronously read stdin?

问题描述

有没有一个优雅的方式来触发一个事件，当有人可以从 System.in ？我想避免轮询 InputStream.available（）。

Is there an elegant way to fire an event when characters are available from System.in? I'd like to avoid polling InputStream.available().

推荐答案

你必须创建一个单独的线程，阻止读取，直到有可用的东西。

You would have to create a separate thread that blocks in read until something is available.

如果你不想真正吃掉输入，你将不得不包装一个内部缓冲区，读入缓冲区，喊叫，当被要求输入时，从缓冲区发回数据。

If you don't want to actually eat up the input, you would have to wrap it with an internal buffer, read into the buffer, shout, and when asked for the input, give back data from the buffer.

你可以这样解决：

InputStream stdin = System.in;

// Create a wrapper (with it's own dedicated read-thread)
MyListenableInputStream listenableInputStream =
        new MyListenableInputStream(stdin);

// Update System.in with something more useful.
System.setIn(listenableInputStream);

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