TCP视频文件传输

我正在尝试进行视频文件传输，但在让服务器开始发送字节时遇到问题。

第一步是客户端连接，套接字被接受。然后客户端发送视频文件名，但服务器从不读取该名称。

这是服务器的代码，直到它被阻止：

 try(ServerSocket serverSocket = new ServerSocket(4005))
    {
        Socket socket = serverSocket.accept();
        System.out.println("accepted");
        OutputStream os = socket.getOutputStream();
        BufferedReader receiveReader = new BufferedReader(new InputStreamReader(socket.getInputStream()));
        System.out.println("This gets printed");
        String request = receiveReader.readLine();//never passes this line
        System.out.println("This doesn't get printed");

这是客户端，直到它阻止等待服务器发送视频字节：

 try(Socket socket = new Socket(IPAddress, 4005))
            {
                byte[] messageBytes = new byte[10000];
                DataOutputStream outputStream = new DataOutputStream(socket.getOutputStream());
                outputStream.writeBytes("REQUEST;"+videoPath);//This is the line that should send the bytes for the server to read, so it won't block.
                String home = System.getProperty("user.home");
                String path = home+"\Downloads" + videoName; 
                path = path.trim();
                FileOutputStream fos = new FileOutputStream(path);
                BufferedOutputStream bos = new BufferedOutputStream(fos);
                InputStream is = socket.getInputStream();
                int bytesRead = 0;
                System.out.println("Downloading file...");
                while((bytesRead = is.read(messageBytes))!=-1)//This blocks here

服务器究竟为什么不读取服务器发送的"Request" + videoPath字节？我也试过outputStream.flush()，运气不好。