我怎么能在一个线程中停止块方法DatagramSocket.receive（） [英] how can i stop the block method DatagramSocket.receive() in a thread

问题描述

我在主线程中创建一个 DatagramSocket ，然后创建一个内部类线程来监听端口。当我在主线程中关闭 DatagramSocket 时，它总是遇到错误套接字关闭，因为在内部类线程中我调用了 receive（）方法，它阻止了内部类线程。这是内部类的代码：

i create a DatagramSocket in the main thread,and then create a inner class thread to listen the port. when i close the DatagramSocket in the main thread, it always came across an error socket closed because in the inner class thread i called the receive() method,and it blocked the inner class thread. here is the code of the inner class:

class ReceiveText extends Thread
{
    @Override
    public void run()
    {
        while(true)
        {
            byte[] buffer = new byte[1024];
            DatagramPacket dp = new DatagramPacket(buffer, buffer.length);
            try {
                udpSocket.receive(dp);//blocked here
                byte[] data = dp.getData();
                String message = new String(data, 0 , dp.getLength());
                setTxtAreaShowMessage(message);
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
}

i想要在关闭DatagramSocket之前停止内部类线程，但不建议使用 stop（）方法。我怎么能这样做？

i want to stop the inner class thread before close the DatagramSocket, but the stop() method is not recommended. how can i do that?

推荐答案

关闭套接字，这将阻止来自阻塞的receive（）调用。如果首先设置一个关闭标志，那么在catch（IOException）块中，如果设置了标志，则可以安全地忽略该异常。 （你可能也可以在DatagramSocket上使用isClosed（）方法而不是标志）

Close the socket, which will stop the receive() call from blocking. If you first set a closed flag then in the catch (IOException) block you can safely ignore the exception if the flag is set. (You could probably also use isClosed() method on DatagramSocket instead of a flag)

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