Android TCP 简单实现

Android

说明

测试程序分为两个部分：Android 客户端、Java 服务端。

• Android 客户端：连接指定IP和PORT，并发送“abcd”。
• Java 服务端：阻塞等待连接。

Android 客户端

public class MainActivity extends Activity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        new Thread(new Client()).start();
    }
    Socket socket = null;
    BufferedWriter writer = null;
    BufferedReader reader = null;
    public class Client implements Runnable {
        public void run() {
            try {
                socket = new Socket("172.24.187.1", 12345);
                writer = new BufferedWriter(new OutputStreamWriter(
                        socket.getOutputStream()));
                reader = new BufferedReader(new InputStreamReader(
                        socket.getInputStream()));
            } catch (UnknownHostException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }
            try {
                // 接收信息
                // String line;
                // while ((line = reader.readLine()) != null) {
                // System.out.println(line);
                // }
                // 发送信息
                // 发送字符串要加\n
                if (writer != null) {
                    writer.write("abcd\n");
                    writer.flush();
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }
}

Java 客户端

public class ServerTest {
    public static void main(String[] args) {
        Thread thread = new Thread(new Runnable() {
            public void run() {
                try {
                    ServerSocket serverSocket = new ServerSocket(12345);
                    while (true) {
                        // block
                        Socket socket = serverSocket.accept();
                        System.out.println("建立连接");
                        // 接收消息
                        BufferedReader br = new BufferedReader(
                                new InputStreamReader(socket.getInputStream(),
                                        "UTF-8"));
                        String line = null;
                        while ((line = br.readLine()) != null) {
                            System.out.println(line);
                        }
                        br.close();
                        // 发送消息
                        // socket.getOutputStream().write((out+"\n").getBytes("UTF-8"));
                    }
                } catch (HeadlessException e) {
                    e.printStackTrace();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        });
        thread.start();
    }