设置System.in以从JTextField读取 [英] Setting System.in to read from JTextField

问题描述

我正在寻找如何将System.in替换为直接从JTextField读取的InputStream的方向.

I'm looking for direction on how to replace System.in with an InputStream that reads directly from a JTextField.

到目前为止，我的方法几乎是反复试验.我目前有

So far my approach has pretty much been trial and error. I currently have;

JTextField input = new JTextField();

System.setIn(new InputStream() {
  int ptr = 0;
  @Override
  public int read() throws IOException {
     int c;
     try {
        c = input.getText().charAt(ptr);
     }
     catch (IndexOutOfBoundsException ioob) {
        return 0;
     }
     ptr++;
     return c;
  }
});

这会产生一个NoSuchElementException，就像在输入为空并且我认为永远找不到分隔符时尝试读取一样.

This yields an NoSuchElementException as in attempts to read when the input is empty and I assume can never find a delimiter.

我错过了什么方法?

推荐答案

好吧，这是我用来使其正常工作的方法.如果有人可以改善此答案，请放心.

Well, this is the method that I used to get it working correctly. If anyone can improve this answer then feel free.

final LinkedBlockingQueue<Character> sb = new LinkedBlockingQueue<Character>();

final JTextField t = new JTextField();
t.addKeyListener(new KeyListener() {
  @Override
  public void keyTyped(KeyEvent e) {
    sb.offer(e.getKeyChar());
  }
  ...
});

System.setIn(new BufferedInputStream(new InputStream() {
  @Override
  public int read() throws IOException {
    int c = -1;
    try {
      c = sb.take();            
    } catch(InterruptedException ie) {
    } 
    return c;           
  }
}));

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