UDP协议的网络编程

public class UDPTest {

//发送端
@Test
public void sender() throws IOException {

DatagramSocket socket = new DatagramSocket();

String str = "我是UDP方式发送的导弹";
byte[] data = str.getBytes();
InetAddress inet = InetAddress.getLocalHost();
DatagramPacket packet = new DatagramPacket(data,0,data.length,inet,9090);

socket.send(packet);

socket.close();

}
//接收端
@Test
public void receiver() throws IOException {

DatagramSocket socket = new DatagramSocket(9090);

byte[] buffer = new byte[100];
DatagramPacket packet = new DatagramPacket(buffer,0,buffer.length);

socket.receive(packet);

System.out.println(new String(packet.getData(),0,packet.getLength()));

socket.close();
}