如何用socket进行通信

已知ip和端口号
我需要传一串字符串给服务器端
发送完成之后
服务器端要返回我一串字符串

有没有好兄弟可以教教代码应该怎么写哈？

• 文章：网络编程Socket通信 中也许有你想要的答案，请看下吧

java版本的socket客户端编程，可以参考这篇文章
java实现Socket客户端向服务端发送信息_小姚同學的博客-CSDN博客_java socket 发送数据

TCP服务端：

import java.net.InetSocketAddress;
import java.net.ServerSocket;
import java.net.Socket;

public class ServiceServer {

    public static void main(String[] args) throws Exception {

        // 创建一个serversocket，绑定到本机的8899端口上
        ServerSocket server = new ServerSocket();
        server.bind(new InetSocketAddress("localhost", 8899));

        // 接受客户端的连接请求;accept是一个阻塞方法，会一直等待，到有客户端请求连接才返回
        while (true) {
            Socket socket = server.accept();
            new Thread(new ServiceServerTask(socket)).start();
        }
    }

}

TCP客户端

import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.net.Socket;

public class ServiceClient {

    public static void main(String[] args) throws Exception {
        
        /*ServiceIterface service = ProxyUtils.getProxy(ServiceIterface.class,"methodA",hostname,port);
        Result = service.methodA(parameters);*/
        
        // 向服务器发出请求建立连接
        Socket socket = new Socket("localhost", 8899);
        // 从socket中获取输入输出流
        InputStream inputStream = socket.getInputStream();
        OutputStream outputStream = socket.getOutputStream();

        PrintWriter pw = new PrintWriter(outputStream);
        pw.println("hello");
        pw.flush();

        BufferedReader br = new BufferedReader(new InputStreamReader(inputStream));
        String result = br.readLine();
        System.out.println(result);
        
        inputStream.close();
        outputStream.close();
        socket.close();
        
        
    }
}

客户端

public class MainActivity extends AppCompatActivity implements View.OnClickListener {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Button btn_accept = (Button) findViewById(R.id.btn_accept);
        btn_accept.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
        new Thread() {
            @Override
            public void run() {
                try {
                    acceptServer();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }.start();
    }

    private void acceptServer() throws IOException {
        //1.创建客户端Socket，指定服务器地址和端口
        Socket socket = new Socket("172.16.2.54", 12345);
        //2.获取输出流，向服务器端发送信息
        OutputStream os = socket.getOutputStream();//字节输出流
        PrintWriter pw = new PrintWriter(os);//将输出流包装为打印流
        //获取客户端的IP地址
        InetAddress address = InetAddress.getLocalHost();
        String ip = address.getHostAddress();
        pw.write("客户端：~" + ip + "~ 接入服务器！！");
        pw.flush();
        socket.shutdownOutput();//关闭输出流
        socket.close();
    }
}