服务端代码:
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
import java.net.SocketException;
public class UDPServer {
/**
* @param args
* @throws Exception
*/
public static void main(String[] args) throws Exception {
DatagramSocket ds = new DatagramSocket();
String str = "haha, my name is UDPServer!";
//发送给本机的地址,端口为8000
DatagramPacket dp = new DatagramPacket(str.getBytes(),0,str.length(), InetAddress.getByName("localhost"),8000);
ds.send(dp);
//演示接受返回回来的数据。
byte[] buf = new byte[100];
DatagramPacket dp2 = new DatagramPacket(buf,100);//字节数组,长度
ds.receive(dp2);
System.out.println(new String(buf,0,dp2.getLength()));
ds.close();
}
}
客户端代码:
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.SocketException;
public class UDPClient {
/**
* @param args
* @throws Exception
*/
public static void main(String[] args) throws Exception {
DatagramSocket ds = new DatagramSocket(8000);
byte [] buf = new byte[100];
DatagramPacket dp = new DatagramPacket(buf,100);
ds.receive(dp);
System.out.println(new String(buf,0,dp.getLength()));
//演示给发送端返回数据,需要发送端去接受
String str = "UDPClient Say:Yes , I received!";
DatagramPacket dp1 = new DatagramPacket(str.getBytes(),str.length(),
dp.getAddress(),dp.getPort());
ds.send(dp1);
ds.close();
}
}