控制台应用程序中的 Java 键盘输入解析
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Java keyboard input parsing in a console app
提问by Jason S
I've just started messing around with JLineto parse character input in console mode. It seems to work well, but I'm wondering:
我刚刚开始使用JLine来解析控制台模式下的字符输入。它似乎运作良好，但我想知道：
Is there a nonblocking way in JLine to find out if characters are available? (i.e. like kbhit()in Windows.)
JLine 中是否有非阻塞方式来确定字符是否可用？（即就像kbhit()在 Windows 中一样。）
I suppose I could always wrap keyboard input in its own thread which then offers the keyboard characters in a thread-safe queue to the main thread, but that seems like it should be unnecessary.
我想我总是可以将键盘输入包装在它自己的线程中，然后将线程安全队列中的键盘字符提供给主线程，但这似乎是不必要的。
EDIT: This is character-by-character parsing. I am not going to use a GUI. The usual InputStream I/O in Java in console mode requires you to hit the Enter key first (e.g. it's buffered input only). Please don't tell me character-by-character input in console mode is impossible in Java; it isn't. JLine does it using a portable interface with a platform-dependent implementation.
编辑：这是逐字符解析。我不会使用 GUI。Java 中控制台模式下的常用 InputStream I/O 要求您先按 Enter 键（例如，它仅是缓冲输入）。请不要告诉我在控制台模式下逐字符输入在 Java 中是不可能的；不是。JLine 使用具有平台相关实现的可移植接口来做到这一点。
Edit update: I was able to hack together a helper class to do the blocking I/O in a worker thread (using JLine for the per-character I/O, warning: you have to parse Ctrl-C yourself!) & then communicate via a synchronized queue with an isempty() routine. For what I'm doing right now that's fine, but I would really like to know a Good Way To Do This In The Future.
编辑更新：我能够在工作线程中编写一个辅助类来执行阻塞 I/O（使用 JLine 进行每个字符的 I/O，警告：您必须自己解析 Ctrl-C！）然后进行通信通过带有 isempty() 例程的同步队列。对于我现在正在做的事情，这很好，但我真的很想知道在未来做这件事的好方法。
采纳答案by Ed Brannin
You seem to be on the right track.
你似乎在正确的轨道上。
I think the "right" way to do this is a worker thread that pours all the blocking I/O into a non-blocking queue. Hava a look at ConcurrentLinkedQueuefrom java.util.concurrent.
我认为执行此操作的“正确”方法是将所有阻塞 I/O 倒入非阻塞队列的工作线程。从java.util.concurrent看一下ConcurrentLinkedQueue。
回答by Pyrolistical
You can't use a console to get non-blocking input without native libraries.
如果没有本机库，您将无法使用控制台获取非阻塞输入。
You'll have to write a Swing app and write a KeyListener
您必须编写一个 Swing 应用程序并编写一个KeyListener
Read this tutorial: http://java.sun.com/docs/books/tutorial/uiswing/events/keylistener.html
阅读本教程：http: //java.sun.com/docs/books/tutorial/uiswing/events/keylistener.html
