例10-9.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10.9 ChatterServer.java
import java.net.*;
import java.io.*;
import java.lang.Thread;
public class CC extends Thread
{
  private DatagramSocket s;
  private InetAddress hostAddress;
  private byte[] buf=new byte[1000];
  static final int INPORT=1711;
  private DatagramPacket dp=new DatagramPacket(buf,buf.length);
  private int id;
  public CC(int identifier)
  {
    id=identifier;
    try
    {
      s=new DatagramSocket();//编号自动指定
      hostAddress=InetAddress.getByName("localhost");
    }
    catch(UnknownHostException e)
    {
      System.err.println("Can't find host.");
      System.exit(1);
    }
    catch(SocketException e)
    {
      System.err.println("Can't open Socket.");
      e.printStackTrace();
      System.exit(1);
    }
    System.out.println("ChatterClient started.");
  }
  public void run()
  {
    try
    {
      for(int i=0;i<25;i++)
      {
        String outMessage="Client #"+id+",message#"+i;
        s.send(Dgram.toDatagram(outMessage,hostAddress,CS.INPORT));
        s.receive(dp);
        String rcvd="Client#"+id+",rcvd from "+dp.getAddress()+","+dp.getPort()+":"+Dgram.toString(dp);
        System.out.println(rcvd);
      }
    }
    catch(IOException e)
    {
      e.printStackTrace();
      System.exit(1);
    }
  }
  public static void main(String args[])
  {
    for(int i=0;i<10;i++)
       (new CC(i)).start();
  }
}