java例程练习（网络编程[简单UDP通信试验]）

import java.net.*;
import java.io.*;

public class TestUDPServer {
public static void main(String[] args) throws Exception {
byte [] buf = new byte[1024];
DatagramPacket dp = new DatagramPacket(buf,buf.length);
DatagramSocket ds = new DatagramSocket(5678);

ByteArrayInputStream bais = new ByteArrayInputStream(buf);


while(true) {
DataInputStream dis = new DataInputStream(bais);
ds.receive(dp);//阻塞式的
//System.out.println(new String(buf, 0, dp.getLength()));
System.out.println(dis.readLong());
}
}
}
[java]
import java.net.*;
import java.io.*;
public class TestUDPClient {
public static void main(String[] args) throws Exception{
//向服务器端传一个long类型数字
long n = 10000;
ByteArrayOutputStream baos =
new ByteArrayOutputStream();
DataOutputStream dos = new DataOutputStream(baos);
dos.writeLong(n);
byte [] buf = baos.toByteArray();



//byte [] buf = (new String("hello")).getBytes();

DatagramPacket dp = new DatagramPacket(buf, buf.length, new InetSocketAddress("127.0.0.1",5678));
DatagramSocket ds = new DatagramSocket(9999);
ds.send(dp);
ds.close();
}
}

摘自 Yours风之恋