我正在开发基于 wifi direct 的文件传输应用程序。我可以看到使用 TCP 套接字的传输速度并不令人满意。速度通常为 1Mbps。每当我分析数据传输图时，我都会看到很多尖峰，并且很多秒根本没有数据传输。我知道传输速度应该高得多(可能是 20-30Mbps) 请帮助我提高传输速度。 接受连接的serversocket是

private void serverTask() {
        Log.v(TAG, "server task");
        try {
            serverRunning = true;
            ServerSocket serverSocket = new ServerSocket(
                    DeviceDetailFragment.PORT);
            serverSocket.setReceiveBufferSize(TCP_BUFFER_SIZE);


            Socket client = serverSocket.accept();

            BufferedInputStream inputstream = new BufferedInputStream(
                    client.getInputStream());
            // new BufferedInputStream(client.getInputStream(), 8 * 1024);
            BufferedReader bufferedStream = new BufferedReader(
                    new InputStreamReader(inputstream));


                fileName = bufferedStream.readLine();
                fileSizeInBytes = bufferedStream.readLine();
                fileMime = bufferedStream.readLine();

                f = new File(Globals.fileSavingLocation + fileName);

                File dirs = new File(f.getParent());
                if (!dirs.exists())
                    dirs.mkdirs();

                if (f.exists()) {
                    f.delete();
                }

                f.createNewFile();

        IOUtils.copy(inputstream, new FileOutputStream(f));


                serverSocket.close();
            }
            isSuccessful = true;

        } catch (IOException e) {
            isSuccessful = false;
            Log.e(TAG, e.getMessage());

        }
        serverRunning = false;

    }

发送数据的客户端有如下代码:

 private void clientTask(Intent intent) {
            String fileUri = intent.getExtras().getString(EXTRAS_FILE_PATH);
            String host = intent.getExtras().getString(EXTRAS_ADDRESS);
            String fileName = intent.getExtras().getString(FILE_NAME);
            String fileMimeType = intent.getExtras().getString(FILE_MIME_TYPE);
            final long sizeInBytes = intent.getExtras().getLong(FILE_SIZE);
            Socket socket = new Socket();
            int port = intent.getExtras().getInt(EXTRAS_PORT);

            try {
                socket.setSendBufferSize(TCP_BUFFER_SIZE);
                socket.bind(null);
                socket.connect((new InetSocketAddress(host, port)),
                        SOCKET_TIMEOUT);

                BufferedOutputStream stream = new BufferedOutputStream(
                        socket.getOutputStream());
                ContentResolver cr = FileTransferService.this
                        .getApplicationContext().getContentResolver();
                InputStream is = null;

                BufferedWriter bufferStream = new BufferedWriter(
                        new OutputStreamWriter(stream));


                bufferStream.write(fileName);
                bufferStream.newLine();
                bufferStream.flush();
                bufferStream.write(String.valueOf(sizeInBytes));
                bufferStream.newLine();
                bufferStream.flush();

                bufferStream.write(fileMimeType);
                bufferStream.newLine();
                bufferStream.flush();


                try {

                    is = new BufferedInputStream(cr.openInputStream(Uri
                            .parse(fileUri)));

                } catch (FileNotFoundException e) {

                    isSuccessful = false;

                }
 IOUtils.copy(is, stream);


                isSuccessful = true;

            } catch (IOException e) {
                Log.e(TAG, e.getMessage());
                isSuccessful = false;
            } finally {
                if (socket != null) {
                    if (socket.isConnected()) {
                        try {
                            socket.close();
                        } catch (IOException e) {
                            // Give up
                            e.printStackTrace();
                        }
                    }
                }
            }

TCP_BUFFER_SIZE 的值设置为 1024*512。

我尝试了很多改变 TCP_BUFFER_SIZE 的值，但没有成功。我用 Apache Commons IOUtils 替换了复制流的实现。 帮帮我

更新: 请看下面的传输图

最佳答案

看来你正在重载缓冲区，从setReceiveBufferSize() javadoc

It is possible to change the value subsequently, by calling Socket.setReceiveBufferSize(int). However, if the application wishes to allow a receive window larger than 64K bytes, as defined by RFC1323 then the proposed value must be set in the ServerSocket before it is bound to a local address. This implies, that the ServerSocket must be created with the no-argument constructor, then setReceiveBufferSize() must be called and lastly the ServerSocket is bound to an address by calling bind().

关于java - 提高java/android中TCP套接字的传输速度，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/16059196/