Java ネットワーク プログラミングはデータ送信をどのように実装しますか?

// 从文件中读取数据
InputStream fileInputStream = new FileInputStream("data.txt");
// 从流中读取数据并存储到字节数组中
byte[] data = new byte[1024];
int bytesRead = fileInputStream.read(data);

// 向文件中写入数据
OutputStream fileOutputStream = new FileOutputStream("output.txt");
// 将字节数组写入流
fileOutputStream.write(data, 0, bytesRead);

// 创建 ServerSocket 并绑定到端口
ServerSocket serverSocket = new ServerSocket(1234);
// 等待客户端连接
Socket clientSocket = serverSocket.accept();
// 从套接字读取数据
InputStream inputStream = clientSocket.getInputStream();
byte[] data = new byte[1024];
int bytesRead = inputStream.read(data);

// 创建 Socket 并连接到服务器
Socket clientSocket = new Socket("localhost", 1234);
// 向套接字写入数据
OutputStream outputStream = clientSocket.getOutputStream();
outputStream.write("Hello from client!".getBytes());

// 从文件中读取数据并通过套接字发送
InputStream fileInputStream = new FileInputStream("data.txt");
Socket clientSocket = new Socket("localhost", 1234);
OutputStream outputStream = clientSocket.getOutputStream();
int bytesRead;
byte[] data = new byte[1024];
while ((bytesRead = fileInputStream.read(data)) > 0) {
    outputStream.write(data, 0, bytesRead);
}