您可以同时写入套接字的输入和输出流吗? [英] Can you write to a sockets input and output stream at the same time?

问题描述

我有一个Java应用程序，即Voip.我正在使用一个套接字通过线程同时发送和接收信息.代码如下所示.

I have a Java application which is Voip. I am using the one socket to send and receive information at the same time via threads. Code is shown below ..

Socket clientSocket = sockList.accept();
OutputStream outSock = clientSocket.getOutputStream();
InputStream inSock = clientSocket.getInputStream();
new Thread( new Capture(outSock)).start();
new Thread( new PlayAudio(inSock)).start();
outSock.close();
clientSocket.close();

我发现的问题是，当我写到输出流时，它在第一次写时阻塞.我发送的字节不多.贝娄是我的写代码.

The problem that I'm finding is that when I write to the outputstream, it blocks on the first write. I'm sending not many bytes. Bellow is my write code.

private class Capture implements Runnable{

    private OutputStream out;
    public Capture(OutputStream out){
        this.out = out;
    }
    @Override
    public void run() {
        try{
            int numBytesRead;
            TargetDataLine outLine = getMic();
            outLine.open();
            outLine.start();

            byte[] data = new byte[outLine.getBufferSize() / 5];
            byte[] test = {0x1,0x1,0x1};

            while(true) {       
                //numBytesRead =  outLine.read(data, 0, data.length);
                //System.out.println(numBytesRead);
                out.write(test, 0, test.length);
                out.flush();
                /*if(numBytesRead > 0){
                    out.write(data, 0, data.length);
                    System.out.println("C");
                }*/
            }
        }catch(Exception ex){}
    }
}

读取声音代码的另一个线程是...

The other thread that reads the sound code is ...

private class PlayAudio implements Runnable{

    private InputStream in;
    public PlayAudio(InputStream in){
        this.in = in;
    }
    @Override
    public void run() {
        int write;
        try{
        SourceDataLine inLine = getSpeaker();
        inLine.open();
        inLine.start();
        byte[] data = new byte[inLine.getBufferSize()];
        byte[] test = new byte[3];
        while(true){
            System.out.println(1);
            //write = in.read(data, 0, data.length);
            in.read(test, 0 , test.length);
            System.out.println(2);
            /*if(write > 0){
                inLine.write(data, 0, write);
                System.out.println(3);
                System.out.println(write);
            }*/
        }
        } catch(Exception ex){}
    }

}

由于我只是想使其正常工作，因此我已经注释了大部分实际代码.我的写函数在第一次写时无限期地阻塞.可能这可能是我的线程有问题吗?我唯一的想法是输出流和输入流共享我的套接字对象，这可能会导致死锁或其他问题.请让我知道最新情况.

I've commented a good portion of the actual code since I'm just trying to get it to work. My write function blocks indefinitely on the first write. Is it possible this could be a problem with my threads? My only thought is that the output and input streams are sharing my socket object which may cause a deadlock or something. Please let me know whats up.

推荐答案

是的，您可以同时写入套接字的输入和输出流.

Yes you can write to a sockets input and output stream at the same time.

来自 do-java-sockets-support-full-duplex

由于输入流和输出流是Socket中的单独对象，因此您可能要担心的唯一问题是，如果有两个试图读取或写入的线程(两个线程，相同的输入/输出流)，会发生什么情况?同时? InputStream/OutputStream类的读/写方法不同步.但是，如果使用的是InputStream/OutputStream的子类，则可能会同步正在调用的读取/写入方法.您可以检查javadoc中是否有您要调用的类/方法，然后很快就可以找出来.

Since the input stream and the output stream are separate objects within the Socket, the only thing you might concern yourself with is, what happens if you had 2 threads trying to read or write (two threads, same input/output stream) at the same time? The read/write methods of the InputStream/OutputStream classes are not synchronized. It is possible, however, that if you're using a sub-class of InputStream/OutputStream, that the reading/writing methods you're calling are synchronized. You can check the javadoc for whatever class/methods you're calling, and find that out pretty quick.

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