这样改改可能可以:import java.io.*;
import java.net.*;
public class a1807
{
static final int port = 9696;
public static void main(String args[]) throws Exception
{
if (args.length!=2)
{
System.out.println("java a1807 <hostname> <msg>");
System.exit(0);
}
InetAddress address=InetAddress.getByName(args[0]);
//int msglen = args[1].length();
//byte msg[] = new byte[msglen];
byte msg[] = args[1].getBytes();
//args[1].getBytes(0,msglen,msg,0);
DatagramPacket packet = new DatagramPacket(msg,msg.length,address,port);
DatagramSocket socket = new DatagramSocket();
socket.send(packet);
socket.close();
}
}
import java.net.*;
public class a1807
{
static final int port = 9696;
public static void main(String args[]) throws Exception
{
if (args.length!=2)
{
System.out.println("java a1807 <hostname> <msg>");
System.exit(0);
}
InetAddress address=InetAddress.getByName(args[0]);
//int msglen = args[1].length();
//byte msg[] = new byte[msglen];
byte msg[] = args[1].getBytes();
//args[1].getBytes(0,msglen,msg,0);
DatagramPacket packet = new DatagramPacket(msg,msg.length,address,port);
DatagramSocket socket = new DatagramSocket();
socket.send(packet);
socket.close();
}
}
al806.java:
import java.io.*;
import java.net.*;
public class al806
{
static final int port=9696;
public static void main(String args[]) throws Exception
{
byte buf[]=new byte[1024];
String str;
for ( ; ; )
{
DatagramPacket packet = new DatagramPacket(buf,buf.length);
DatagramSocket socket = new DatagramSocket(port);
socket.receive(packet);
str = new String(packet.getData(),0,packet.getLength());
System.out.println("UDP receive form " +
packet.getAddress()+"\npacket port=" +
packet.getPort() + "\nmsg=" + str);
socket.close();
}
}
}al807.java:
import java.io.*;
import java.net.*;
public class al807
{
static final int port = 9696;
public static void main(String args[]) throws Exception
{
if (args.length!=2)
{
System.out.println("java a1807 <hostname> <msg>");
System.exit(0);
}
InetAddress address=InetAddress.getByName(args[0]);
byte[] msg=args[1].getBytes();
DatagramPacket packet = new DatagramPacket(msg,msg.length,address,port);
DatagramSocket socket = new DatagramSocket();
socket.send(packet);
socket.close();
}
}
试试吧!