基于UDP的Socket编程

 

public class UDPTest1 {     public static void main(String[] args) throws Exception     { 　　　　//接收数据报        DatagramSocket socket = new DatagramSocket(7000);               byte[] buffer = new byte[1000];               DatagramPacket packet = new DatagramPacket(buffer,1000);               socket.receive(packet);               System.out.println(new String(buffer, 0 , packet.getLength()));                      //发送数据报        String str = "Welcome";               DatagramPacket packet2 = new DatagramPacket(str.getBytes(),str.length(),packet.getAddress(),packet.getPort());               socket.send(packet2);               socket.close();     } }

 

 

public class UDPTest2 {     public static void main(String[] args) throws Exception     { 　　　　//发送数据报        DatagramSocket socket = new DatagramSocket();          String str = "Hello World";          DatagramPacket packet = new DatagramPacket(str.getBytes(),               str.length(), InetAddress.getByName("localhost"), 7000);               socket.send(packet);               //接收数据报        byte[] buffer = new byte[1000];               DatagramPacket packet2 = new DatagramPacket(buffer,1000);               socket.receive(packet2);               System.out.println(new String(buffer,0,packet2.getLength()));               socket.close();     } }