Android编程实现TCP、UDP客户端通信功能示例

private void tcpdata() {
    try {
        Socket s = new Socket("192.168.0.25", 65500);
        // outgoing stream redirect to socket
        OutputStream out = s.getOutputStream();
        // 注意第二个参数据为true将会自动flush，否则需要需要手动操作out.flush()
        PrintWriter output = new PrintWriter(out, true);
        output.println("Hello IdeasAndroid! 伪IP为："
                + SIMCardToIP("13512345006"));
        InputStream inputStream = s.getInputStream();
        DataInputStream input = new DataInputStream(inputStream);
        byte[] b = new byte[10000];
        int length = input.read(b);
        inputReader = new InputStreamReader(inputStream);
        String Msg = new String(b, 0, length, "gb2312");
        Toast.makeText(TcpTest.this, Msg, 1000).show();
        Log.d("Tcp Demo", "message From Server:" + Msg);
        s.close();
    } catch (UnknownHostException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }
}

public String send(String msg) {
    StringBuilder sb = new StringBuilder();
    InetAddress local = null;
    try {
        local = InetAddress.getByName("192.168.0.25"); // 本机测试
    } catch (UnknownHostException e) {
        e.printStackTrace();
    }
    try {
        dSocket = new DatagramSocket(); // 注意此处要先在配置文件里设置权限,否则会抛权限不足的异常
    } catch (SocketException e) {
        e.printStackTrace();
    }
    int msg_len = msg == null ? 0 : msg.length();
    DatagramPacket dPacket = new DatagramPacket(msg.getBytes(), msg_len,
            local, SERVER_PORT);
    try {
        dSocket.send(dPacket);
    } catch (IOException e) {
        e.printStackTrace();
    }
    try {
        dSocket.receive(dPacket);
        sb.append(new String(dPacket.getData()));
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
    dSocket.close();
    return sb.toString();
}