public class MainActivity extends AppCompatActivity {

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        new Thread() {

            @Override

            public void run() {

                super.run();

                try {

                    Socket socket = new Socket("这里是你的本地ip地址,cmd输入ipconfig会显示", 8080);

                    if (socket.isConnected()) {

                        System.out.println("已连接");

                        OutputStream outputStream = socket.getOutputStream();

                        String message="你好  yiwangzhibujian";

                        outputStream.write(message.getBytes("UTF-8"));

                        System.out.println("写出到服务器");

                        outputStream.close();

                        socket.close();

                    }

                } catch (IOException e) {

                    e.printStackTrace();

                }

            }

        }.start();

    }

    }