android 实现UDP发送和接收

http://www.51testing.com/html/88/377588-829424.html

public class BroadCastUdp extends Thread
{
private String dataString;
DatagramSocket udpSocket;
byte[] buffer=null;
public BroadCastUdp(String dataString)
{
this.dataString = dataString;
}

public void run()
{
DatagramPacket dataPacket = null;
try
{
buffer = dataString.getBytes();
udpSocket = new DatagramSocket(DEFAULT_PORT);
udpSocket.setBroadcast(true);
dataPacket = new DatagramPacket(buffer, buffer.length,InetAddress.getByName("255.255.255.255"),8888);
} catch (Exception e)
{
e.printStackTrace();
Log.e(TAG+"1", e.toString());
}
try
{
udpSocket.send(dataPacket);

DatagramPacket dpIn=null;
byte[] bufferIn=new byte[256];
dpIn=new DatagramPacket(bufferIn,bufferIn.length);
udpSocket.receive(dpIn);
System.out.println(new String(bufferIn,0,buffer.length));
} catch (Exception e)
{
e.printStackTrace();
Log.e(TAG+"2", e.toString());
}
if(udpSocket!= null)
udpSocket.close();
}
}