1 class UDPReceiveDemo 2 { 3     public static void main(String[]args)throws Exception 4     { 5         //建立接收端socket服务 6         DatagramSocket ds=new DatagramSocket(12222);//明确监听的端口号 7         //创建接收数据的数据包 8         byte[] buf=new byte[1024]; 9         DatagramPacket dp=new DatagramPacket(buf,buf.length);10         //接收数据11         ds.receive(dp);12         //打印数据13         System.out.println(dp.getAddress());14         System.out.println(dp.getPort());15         System.out.println(new String(dp.getData(),0,dp.getLength()));16         //关闭服务17         ds.close();18     }19 }