Datagrams 数据报 示例
//Demonstrate Datagrams.import java.net.*;
class WriteServer{
public static int serverPort = 666 ;
public static int clientPort = 999 ;
public static int buffer_size = 1024 ;
public static DatagramSocket ds ;
public static byte buffer[] = new byte;
public static void TheServer() throws Exception{
int pos = 0;
while(true){
int c = System.in.read();
switch(c){
case -1:
System.out.println("Server Quits.");
return;
case '\r':
break;
case '\n':
ds.send(new DatagramPacket(buffer,pos,InetAddress.getLocalHost(),clientPort));
pos = 0;
break;
default:
buffer = (byte)c;
}
}
}
public static void TheClient() throws Exception{
while(true){
DatagramPacket p = new DatagramPacket (buffer,buffer.length);
ds.receive(p);
System.out.println(new String(p.getData(),0,p.getLength()));
}
}
public static void main(String[] args) throws Exception{
if(args.length == 1){
ds = new DatagramSocket(serverPort);
TheServer();
}else{
ds = new DatagramSocket(clientPort);
TheClient();
}
}
}
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