用JAVA和UDP实现字符串的发送和接收

import java.io.IOException; import java.net.DatagramPacket; import java.net.DatagramSocket; import java.net.SocketException; public class Recv { public static void main(String[] args) throws IOException { // TODO Auto-generated method stub System.out.println("等待Send发过来的信息："); DatagramSocket datagramSocket = new DatagramSocket(8080);//指定接受信息的端口 byte[] buf = new byte[1024];//指定最大接受信息的大小 DatagramPacket datagramPacket = new DatagramPacket(buf, 1024); datagramSocket.receive(datagramPacket);//阻塞等待 String msg=new String(datagramPacket.getData(), 0,datagramPacket.getLength()); String string ="收到来自IP+端口号为 "+ datagramPacket.getAddress().getHostAddress()+ ":" + datagramPacket.getPort()+" 的主机 "+"的信息： "+msg; System.out.println(string); datagramSocket.close(); } }