Java 네트워크 프로그래밍에서 파일 및 스트림 전송을 구현하는 방법은 무엇입니까?

try (FileInputStream fis = new FileInputStream("file.txt");
     FileOutputStream fos = new FileOutputStream("output.txt")) {
    byte[] buffer = new byte[1024];
    int read;

    while ((read = fis.read(buffer)) > 0) {
        fos.write(buffer, 0, read);
    }
} catch (IOException e) {
    e.printStackTrace();
}

try (ServerSocket serverSocket = new ServerSocket(8080);
     Socket clientSocket = serverSocket.accept();
     FileInputStream videoFile = new FileInputStream("video.mp4")) {

    OutputStream out = clientSocket.getOutputStream();

    byte[] buffer = new byte[1024];
    int read;

    while ((read = videoFile.read(buffer)) > 0) {
        out.write(buffer, 0, read);
    }
} catch (IOException e) {
    e.printStackTrace();
}

try (Socket clientSocket = new Socket("127.0.0.1", 8080);
     InputStream in = clientSocket.getInputStream();
     FileOutputStream videoFile = new FileOutputStream("downloaded.mp4")) {

    byte[] buffer = new byte[1024];
    int read;

    while ((read = in.read(buffer)) > 0) {
        videoFile.write(buffer, 0, read);
    }
} catch (IOException e) {
    e.printStackTrace();
}