我是用 DataInputStream 以及 DataOutputStream 这样地：
服务器.java：

public class Server {
    public static void main(String[] args) throws IOException {
        ServerSocket serverSocket = new ServerSocket(10001);
        Socket socket = serverSocket.accept();
        DataInputStream dataInputStream = new DataInputStream(socket.getInputStream());
        DataOutputStream dataOutputStream = new DataOutputStream(socket.getOutputStream());
        String command = (String) dataInputStream.readUTF();
        StringBuilder commandLineResult = new StringBuilder();
        Process process = Runtime.getRuntime().exec(command);
        try (BufferedReader br = new BufferedReader(new InputStreamReader(process.getInputStream()))) {
            String line;
            while ((line = br.readLine()) != null) {
                commandLineResult.append(line + "\n");
            }
        }
        dataOutputStream.writeUTF(commandLineResult.toString());
        serverSocket.close();
    }
}

客户端.java：

public class Client {
    public static void main(String[] args) throws UnknownHostException, IOException {
        Socket clientSocket = new Socket("localhost", 10001);
        DataOutputStream dataOutputStream = new DataOutputStream(clientSocket.getOutputStream());
        DataInputStream dataInputStream = new DataInputStream(clientSocket.getInputStream());
        dataOutputStream.writeUTF("ls -l");
        System.out.println(dataInputStream.readUTF());

    }
}

当服务器运行时，客户机可以使用其 DataOutputStream . 之后，服务器可以使用该命令：
服务器使用 DataInputStream 然后它把它传递到 Runtime.getRuntime().exec(command) 方法。这种方法有其独特的优点 inputStream 你以后可以从中阅读 process 并写入服务器的 DataOutputStream ，它将命令行内容发送到客户端套接字。之后，您可以使用客户端的 DataInputStream .