Java 实现 UDP

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UDP 服务端

package www.whf.udp;import java.net.DatagramPacket;import java.net.DatagramSocket;import java.net.SocketException;public class test {    public static void main(String[] args) throws SocketException {        DatagramSocket datagramSocket = new DatagramSocket(2000);        while (true) {            try {                byte[] buf = new byte[1024];                DatagramPacket p = new DatagramPacket(buf, 1024);                // DatagramPacket p1=new                // DatagramPacket("fdgff".getBytes(),1024);                datagramSocket.receive(p);                datagramSocket.send(p);                String str = new String(p.getData(), 0, p.getLength());                System.out.println(str);            } catch (Exception e) {                e.printStackTrace();            }        }    }}

UDP 客户端

package www.whf.udp;import java.net.DatagramPacket;import java.net.DatagramSocket;import java.net.InetAddress;import java.net.SocketException;public class test1 {    public static void main(String[] args) throws SocketException {        DatagramSocket ds=new DatagramSocket(3000);        String str="hello wprld";        try {            DatagramPacket  db=new DatagramPacket(str.getBytes(), str.length(),InetAddress.getByName("localhost"),2000);            byte[] buf=new byte[1024];            DatagramPacket p=new DatagramPacket(buf, 1024);            ds.send(db);            ds.receive(p);            ds.close();            System.out.println(new String(buf));        } catch (Exception e) {            // TODO Auto-generated catch block            e.printStackTrace();        }    }}

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