上次讲到android虚拟机和pc机进行通讯，现在就将小程序复杂一点点。
pc将获得的数据原封不动得再发给android虚拟机。
示例图：
代码在原来的基础上进行了补充：
public class Server { /** * @param args * @throws IOException */ public static void main(String[] args) throws IOException { // TODO Auto-generated method stub DatagramSocket ds = new DatagramSocket(10000); while(true){ byte [] b = new byte[1024]; DatagramPacket dp = new DatagramPacket(b,b.length); ds.receive(dp); System.out.println("IP: "+dp.getSocketAddress());//输出内容：IP: /127.0.0.1:56934 System.out.println("prot: "+dp.getPort()); System.out.println("data: "+new String(dp.getData(),0,dp.getLength(),"utf-8"));// 上面和前一篇文章内容一样。只是多了一个server端的send。dp.getSocketAddress()这个就是获取android的Inetaddress DatagramPacket dp2 = new DatagramPacket(dp.getData(), dp.getLength(), dp.getSocketAddress()); ds.send(dp2); } }}android端的client：
public class AndroidUdpActivity extends Activity { DatagramSocket ds = null; DatagramPacket dp,dp2 = null; Button b = null; EditText et = null; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); b = (Button) this.findViewById(R.id.button1); et = (EditText) this.findViewById(R.id.editText1); try { ds = new DatagramSocket(10001); } catch (SocketException e) { // TODO Auto-generated catch block e.printStackTrace(); } b.setOnClickListener(new OnClickListener() { // TODO Auto-generated method stub @Override public void onClick(View v) { // String s = "welcome to c...."; String s = et.getText().toString(); byte [] buf = s.getBytes(); int length = buf.length; try { dp = new DatagramPacket(buf,length,InetAddress.getByName("10.0.2.2"),10000); } catch (UnknownHostException e) { // TODO Auto-generated catch block e.printStackTrace(); } try { ds.send(dp); et.setText(""); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); }//黑体字处为在以前代码上新加的内容，即解析获得的内容。 [b] byte [] data = new byte[1024]; dp2 = new DatagramPacket(data, data.length); try { ds.receive(dp2); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); }//这里可以获得PC机上的IP，端口等信息。 System.out.println("IP: " + dp2.getSocketAddress());//输出内容： IP: 10.0.2.2/10.0.2.2:10000 try { System.out.println("data: "+new String(dp2.getData(),0,dp2.getLength(),"utf-8")); } catch (UnsupportedEncodingException e) { // TODO Auto-generated catch block e.printStackTrace(); } //ds.close();[/b] } }); }}不解android虚拟机的IP设定。