例10-8.java

JAVA用Java和XML建立试题库管理系统,试题库管理系统的设计

//例10.8 ChatterServer.java
import java.net.*;
import java.io.*;
import java.util.*;
public class CS
{
  static final int INPORT=1711;
  private byte[] buf=new byte[1000];
  private DatagramPacket dp=new DatagramPacket(buf,buf.length);
  private DatagramSocket socket;
  public CS()
  {
    try
    {
      socket=new DatagramSocket(INPORT);
      System.out.println("Server started");
      while(true)
      {
        socket.receive(dp);
        String rcvd=Dgram.toString(dp)+", from address:"+dp.getAddress()+",port:"+dp.getPort();
        System.out.println(rcvd);
        String echoString="Echoed:"+rcvd;
        DatagramPacket echo=Dgram.toDatagram(echoString,dp.getAddress(),dp.getPort());
        socket.send(echo);
      }
    }
    catch(SocketException e)
    {
      System.out.println("Can't open socket.");
      System.exit(1);
    }
    catch(IOException e)
    {
      System.out.println("Communication Error");
      e.printStackTrace();
    }
  }
  public static void main(String args[])
  {
    new CS();
  }
}