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import java.io.InputStream;
import java.io.OutputStream;
import java.net.InetAddress;
import java.net.Socket;
import java.util.Scanner;
public class TestClient {
    public static void main(String[] args) throws Exception {
        InetAddress serverIP = InetAddress.getLocalHost();
        int serverPort = 3000;
        Socket client = new Socket(serverIP, serverPort);
        Scanner input = new Scanner(System.in);
        System.out.println("??????????");
        String info = input.nextLine();
        OutputStream outputStream = client.getOutputStream();
        outputStream.write(info.getBytes());
        outputStream.close();
        client.close();
    }
}

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import java.io.IOException;
import java.io.InputStream;
import java.net.ServerSocket;
import java.net.Socket;
public class TestServer {
    public static void main(String[] args) throws Exception {
        int serverPort = 3000;
        ServerSocket serverSocket = new ServerSocket(serverPort);
        System.out.println("?????????????????");
        Socket clientSocket = serverSocket.accept();
        InputStream inputStream = clientSocket.getInputStream();
        byte[] data = new byte[1024];
        while (true) {
            int len = inputStream.read(data);
            String msg = new String(data, 0, len);
            System.out.println("???????" + msg);
            if (msg.equals("886")) {
                break;
            }
        }
        inputStream.close();
        clientSocket.close();
        serverSocket.close();
    }
}

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????????????????????TCP??????????????????