【android】与pc机进行UDP通信（二）

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：

[img]http://dl.iteye.com/upload/attachment/558271/c2d21c8c-005b-387f-9ddc-6bb5a0f23c2e.png[/img]

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。