Question

我目前正在开发一个控制台应用程序，它使用Java 7 WatchService API观察多个目录。在主要方法中观察循环发生时，我想要一个单独的线程从System.in流中读取以检查观察是否必须停止。

我的Runnable实现如下：

public class InputHandler implements Runnable {
    @Override
    public void run() {
        boolean keepRunning = true;
        int readBytes = -1;
        byte[] readChunk = new byte[8];

        System.out.println("Starting directory observation ...");
        System.out.println("Type 'stop' to end directory observation.\n");

        while (keepRunning) {
            try {
                readBytes = System.in.read(readChunk);

                if (readBytes > 4) {
                    keepRunning &= !(new String(readChunk).contains("stop"));
                }
            } catch (Exception e) {
                System.err.println("Failed to read input!");
                keepRunning = false;
            }
        }

        System.out.println("\nDirectory observation stops now ...");
    }
}

我的主要方法是：

// Prepare the WatchService stuff ...
Thread ihThread = new Thread(new InputHandler());

do {
    WatchKey watchKey = directoryWatch.take();

    for (WatchEvent<?> event : watchKey.pollEvents()) {
        if (StandardWatchEventKinds.ENTRY_CREATE.equals(event.kind())) {
            // do something
        }
    }

    keepRunning &= !Thread.State.TERMINATED.equals(ihThread.getState())
            && watchKey.reset();
} while (keepRunning);

当我运行代码时，没有打印任何消息，我无法在命令行中写任何内容。如何从新主题访问“主要”System.in和System.out？

从另一个Thread中读取System.in

0 个答案: