Networking with Sockets - SCJD Exam with J2SE 5 - page 206

Another key point regarding the socket client is that it implements DBClient . This ensures
that our rent and return methods are available to any client using DVDSocketServer . The
DvdSocketClient.java is displayed in Listing 7-1. The entire source code for the sockets pack-
age can be downloaded from the Apress web site ( http://www.apress.com ) in the Source Code
section—more details on what can be downloaded and how the code can be compiled and
packaged are listed in Chapter 9.

■ Tip On Linux and most Unix computers, you can also specify localhost.localdomain as the host-

name. You can also use the loopback addresses (127.0.0.0-127.0.0.254) instead of the hostname.
Accepted practice is to use 127.0.0.1 as the standard loopback address, leaving the other potential
loopback addresses for specialist purposes (e.g., for testing multiple identical applications on different
addresses simultaneously).

Listing 7-1. DVDSocketClient.java

public class DvdSocketClient implements DBClient {
/**
* The socket client that gets instaniated for the socket connection.
*/
private Socket socket = null;
/**
* The outputstream used to write a serialized object to a socket server.
*/
private ObjectOutputStream oos = null;
/**
* The inputstream used to read a serialized object (a response)
* from the socket server.
*/
private ObjectInputStream ois = null;
/**
* The IP address of the machine the client is going to attempt a
* connection.
*/
private String ip = null;
/**
* The port number we will be connecting on.
*/
private int port = 3000;
/**
* Default constructor.
*/
public DvdSocketClient () throws UnknownHostException, IOException {
this("localhost", "3000");

}