Secure Sockets - Java Network Programming - page 328

javax.net
The abstract socket factory classes used instead of constructors to create secure
sockets.
java.security.cert
The classes for handling the public-key certificates needed for SSL.
com.sun.net.ssl
The concrete classes that implement the encryption algorithms and protocols in
Sun's reference implementation of the JSSE. Technically, these are not part of the
JSSE standard. Other implementers may replace this package with one of their own;
for instance, one that uses native code to speed up the CPU-intensive key generation
and encryption process.
Creating Secure Client Sockets
If you don't care very much about the underlying details, using an encrypted SSL socket
to talk to an existing secure server is truly straightforward. Rather than constructing a
java.net.Socket object with a constructor, you get one from a jav
ax.net.ssl.SSLSocketFactory using its createSocket() method. SSLSocketFacto
ry is an abstract class that follows the abstract factory design pattern. You get an instance
of it by invoking the static SSLSocketFactory.getDefault() method:
SocketFactory factory = SSLSocketFactory . getDefault ();
Socket socket = factory . createSocket ( "login.ibiblio.org" , 7000 );
This either returns an instance of SSLSocketFactory or throws an InstantiationEx
ception if no concrete subclass can be found. Once you have a reference to the factory,
use one of these five overloaded createSocket() methods to build an SSLSocket :
public abstract Socket createSocket ( String host , int port )
throws IOException , UnknownHostException
public abstract Socket createSocket ( InetAddress host , int port )
throws IOException
public abstract Socket createSocket ( String host , int port ,
InetAddress interface , int localPort )
throws IOException , UnknownHostException
public abstract Socket createSocket ( InetAddress host , int port ,
InetAddress interface , int localPort )
throws IOException , UnknownHostException
public abstract Socket createSocket ( Socket proxy , String host , int port ,
boolean autoClose ) throws IOException
The first two methods create and return a socket that's connected to the specified host
and port or throw an IOException if they can't connect. The third and fourth methods
connect and return a socket that's connected to the specified host and port from the
specified local network interface and port. The last createSocket() method, however,