address.java

JAVA网络编程技术内幕一书的源代码

/*
 * Java Network Programming, Second Edition
 * Merlin Hughes, Michael Shoffner, Derek Hamner
 * Manning Publications Company; ISBN 188477749X
 *
 * http://nitric.com/jnp/
 *
 * Copyright (c) 1997-1999 Merlin Hughes, Michael Shoffner, Derek Hamner;
 * all rights reserved; see license.txt for details.
 */

package record;

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

import DNSRR;
import DNSInputStream;

public class Address extends DNSRR {
  private int[] ipAddress = new int[4];
  
  protected void decode (DNSInputStream dnsIn) throws IOException {
    for (int i = 0; i < 4; ++ i)
      ipAddress[i] = dnsIn.readByte ();
  }
  
  public byte[] getAddress () {
    byte[] ip = new byte[4];
    for (int j = 0; j < 4; ++ j)
      ip[j] = (byte) ipAddress[j];
    return ip;
  }
  
  public InetAddress getInetAddress () throws UnknownHostException {
    return InetAddress.getByName (toByteString ());
  }
  
  private String toByteString () {
    return ipAddress[0] + "." + ipAddress[1] + "." +
      ipAddress[2] + "." + ipAddress[3];
  }
  
  public String toString () {
    return getRRName () + "\tinternet address = " + toByteString ();
  }
}