BufferedReader 死锁：如何正确关闭 BufferedReader

Question

我有一个死锁问题与 BufferedReader 从 InputStreamReader 读取（即从 InputStream 中读取）。

有一个 Swing GUI 正在被用户关闭。正在处理 JFrame 并调用完成方法。

 DppGUI gui = this;
 addWindowListener(new WindowAdapter()
    {
        @Override
        public void windowClosing(WindowEvent windowEvent)
        {
            int choice = Dialogs.displayExitQuestionDialog(gui);
            if (choice == JOptionPane.YES_OPTION)
            {
                _dataReciever.finish();
                dispose();
            }
        }
    });

finish 方法需要运行打破 while 循环以最终让线程完成。这是完成方法。

public void finish()
{
    _isRunning = false; // This boolean shall break a while loop.
    _listener = null;
    try
    {
        _processInputStream.close();
        System.out.println("Closed input stream");

        _inputStreamReader.close();
        System.out.println("Closed input stream reader");

        _reader.close();
        System.out.println("Closed reader");
    }
    catch (IOException e)
    {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
}

问题是我无法弄清楚如何从 "outside" 关闭 BufferedReader 以便

行

while ((line = _reader.readLine()) != null)

被跳过。

这里是死锁的线程（需要在用户关闭gui后立即结束）

@Override
public void run()
{
    _isRunning = true;
    CommandManager commandManager = new CommandManager();
    Process process = null;
    try
    {
        process = commandManager.makeCommand(MqttCoammands.MOSQUITTO_SUB,
                "HFC_001", "");
        System.out.println("Mosquitto Sub Command generated.");
        _processInputStream = process.getInputStream();
        _inputStreamReader = new InputStreamReader(_processInputStream);
        _reader = new BufferedReader(_inputStreamReader);

        String line = null;
        while (_isRunning)
        {
            while ((line = _reader.readLine()) != null) // The program deadlocks in this line when the GUI is closed
            {
                String[] splits = line.split(";");
                _parameterList = Arrays.asList(splits);
                System.out.println(_parameterList.toString());
                _listener.get(_parameterList);
            }
        }
        System.out.println("Left the While loop. Preparing end of Thread.");
        _listener = null;
        //            finish();
    }
    catch (IllegalCommandException e1)
    {
        e1.printStackTrace();
    }
    catch (UnsupportedOperatingSystemException e1)
    {
        e1.printStackTrace();
    }
    catch (IOException e1)
    {
        e1.printStackTrace();
    }
}

为了关闭 BufferedReader，我尝试将其设置为空。我尝试关闭 BufferedReader、InputStreamReader 和 InputStream（如您在 finish 方法中所见），但没有任何效果，程序仍然死锁。有人遇到过同样的问题吗？有人看到解决方案了吗？

提前致谢！

编辑： 忘了说死锁前最后的控制台输出是

closed input stream

来自finish方法。这意味着 InputStreamReader 和 BufferedReader 没有被关闭。

Answer 1

替换

    while (_isRunning)
    {
        while ((line = _reader.readLine()) != null) // The program deadlocks in this line when the GUI is closed
        {

和

    while (_isRunning && (line = _reader.readLine()) != null)
    {

Answer 2

当您围绕 inputstream/reader 创建包装器时 - 对包装器执行关闭操作会关闭被包装的对象。所以你不需要所有那些 close 调用。
我建议您停止自动关闭流的进程，您会收到来自 reader.readLine 的 null。

BufferedReader 死锁：如何正确关闭 BufferedReader

BufferedReader Deadlock: How to properly shutdown a BufferedReader

java

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processbuilder