java UDP´«Êä

TCPͨ¹ý ServerSocket ºÍ Socket À´ÊµÏÖ´«Êä
UDPÖ÷Ҫͨ¹ý DatagramSocket ºÍ DatagramPacket À´Íê³É´«Êä
Ö±½ÓÉÏ´úÂë
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public class UdpServer
{
private DatagramSocket server;
private DatagramPacket packet;
private byte[] b;
private String str;
public UdpServer()
{
Init();
}
private void Init()
{

b = new byte[1024];

receive();
}
private void receive()
{
try
{
server=new DatagramSocket(11111); //°ó¶¨11111¶Ë¿Ú
while(true)
{
packet = new DatagramPacket(b, b.length);
server.receive(packet); //½ÓÊÕÊý¾Ý°ü
int i = packet.getLength();
if(i>0) //Êý¾Ý°üÓÐÄÚÈÝ£¬¾Í´òÓ¡³ö½ÓÊÕµ½µÄÊý¾Ý
{
str = new String(b, 0, i);
System.out.println("½ÓÊÕµ½µÄ×Ö·û == " + str);
packet = null;
}
}
}catch(SocketException e)
{
e.printStackTrace();
}catch(IOException e)
{
e.printStackTrace();
}finally
{
server.close();
}
}
public static void main(String[] args)
{
new UdpServer();
}
}
¿Í»§¶Ë£º
public class UdpClient
{
private DatagramSocket client;
private DatagramPacket packet;
private byte b[];
public UdpClient()
{
Init();
}
private void Init()
{
b = new byte[1024];

send();
}
private void send()
{
try
{
client = new DatagramSocket();

b = "UDPÊý¾Ý·¢ËÍ".getBytes(); //·¢Ë͸ø·þÎñÆ÷¶ËµÄÊý¾Ý

packet = new DatagramPacket(b, b.length, new InetSocketAddress("127.0.0.1", 11111)); //°ó¶¨·þÎñÆ÷
client.send(packet); //·¢ËÍÊý¾Ý°ü
} catch (SocketException e)
{
e.printStackTrace();
} catch (IOException e)
{
e.printStackTrace();
} finally
{
client.close();
}
}
public static void main(String[] args)
{
new UdpClient();
}
}