SocketFactory

public abstract class SocketFactory extends Object

Known Direct Subclasses SSLSocketFactory SSLSocketFactory SSLSocketFactorys create SSLSockets.

This class creates sockets. It may be subclassed by other factories, which create particular subclasses of sockets and thus provide a general framework for the addition of public socket-level functionality.

Socket factories are a simple way to capture a variety of policies related to the sockets being constructed, producing such sockets in a way which does not require special configuration of the code which asks for the sockets:

• Due to polymorphism of both factories and sockets, different kinds of sockets can be used by the same application code just by passing it different kinds of factories.
• Factories can themselves be customized with parameters used in socket construction. So for example, factories could be customized to return sockets with different networking timeouts or security parameters already configured.
• The sockets returned to the application can be subclasses of java.net.Socket, so that they can directly expose new APIs for features such as compression, security, record marking, statistics collection, or firewall tunneling.

Factory classes are specified by environment-specific configuration mechanisms. For example, the getDefault method could return a factory that was appropriate for a particular user or applet, and a framework could use a factory customized to its own purposes.

See Also

• ServerSocketFactory

Protected Constructor Summary

SocketFactory() Creates a SocketFactory.

Public Method Summary

abstract Socket	createSocket(String host, int port) Creates a socket and connects it to the specified remote host at the specified remote port.
abstract Socket	createSocket(InetAddress host, int port) Creates a socket and connects it to the specified port number at the specified address.
abstract Socket	createSocket(InetAddress address, int port, InetAddress localAddress, int localPort) Creates a socket and connect it to the specified remote address on the specified remote port.
abstract Socket	createSocket(String host, int port, InetAddress localHost, int localPort) Creates a socket and connects it to the specified remote host on the specified remote port.
Socket	createSocket() Creates an unconnected socket.
static SocketFactory	getDefault() Returns a copy of the environment's default socket factory.

Inherited Method Summary

From class java.lang.Object

Object	clone() Creates and returns a copy of this Object.
boolean	equals(Object obj) Compares this instance with the specified object and indicates if they are equal.
void	finalize() Invoked when the garbage collector has detected that this instance is no longer reachable.
final Class<?>	getClass() Returns the unique instance of Class that represents this object's class.
int	hashCode() Returns an integer hash code for this object.
final void	notify() Causes a thread which is waiting on this object's monitor (by means of calling one of the wait() methods) to be woken up.
final void	notifyAll() Causes all threads which are waiting on this object's monitor (by means of calling one of the wait() methods) to be woken up.
String	toString() Returns a string containing a concise, human-readable description of this object.
final void	wait(long timeout, int nanos) Causes the calling thread to wait until another thread calls the notify() or notifyAll() method of this object or until the specified timeout expires.
final void	wait(long timeout) Causes the calling thread to wait until another thread calls the notify() or notifyAll() method of this object or until the specified timeout expires.
final void	wait() Causes the calling thread to wait until another thread calls the notify() or notifyAll() method of this object.

Protected Constructors

protected SocketFactory ()

Creates a SocketFactory.

Public Methods

public abstract Socket createSocket (String host, int port)

Creates a socket and connects it to the specified remote host at the specified remote port. This socket is configured using the socket options established for this factory.

If there is a security manager, its checkConnect method is called with the host address and port as its arguments. This could result in a SecurityException.

Parameters

host	the server host name with which to connect, or null for the loopback address.
port	the server port

Returns

• the Socket

Throws

IOException	if an I/O error occurs when creating the socket
SecurityException	if a security manager exists and its checkConnect method doesn't allow the operation.
UnknownHostException	if the host is not known
IllegalArgumentException	if the port parameter is outside the specified range of valid port values, which is between 0 and 65535, inclusive.

See Also

• SecurityManager.checkConnect(String, int)
• Socket.Socket(String, int)

public abstract Socket createSocket (InetAddress host, int port)

Creates a socket and connects it to the specified port number at the specified address. This socket is configured using the socket options established for this factory.

If there is a security manager, its checkConnect method is called with the host address and port as its arguments. This could result in a SecurityException.

Parameters

host	the server host
port	the server port

Returns

• the Socket

Throws

IOException	if an I/O error occurs when creating the socket
SecurityException	if a security manager exists and its checkConnect method doesn't allow the operation.
IllegalArgumentException	if the port parameter is outside the specified range of valid port values, which is between 0 and 65535, inclusive.
NullPointerException	if host is null.

See Also

• SecurityManager.checkConnect(String, int)
• Socket.Socket(java.net.InetAddress, int)

public abstract Socket createSocket (InetAddress address, int port, InetAddress localAddress, int localPort)

Creates a socket and connect it to the specified remote address on the specified remote port. The socket will also be bound to the local address and port suplied. The socket is configured using the socket options established for this factory.

If there is a security manager, its checkConnect method is called with the host address and port as its arguments. This could result in a SecurityException.

Parameters

address	the server network address
port	the server port
localAddress	the client network address
localPort	the client port

Returns

• the Socket

Throws

IOException	if an I/O error occurs when creating the socket
SecurityException	if a security manager exists and its checkConnect method doesn't allow the operation.
IllegalArgumentException	if the port parameter or localPort parameter is outside the specified range of valid port values, which is between 0 and 65535, inclusive.
NullPointerException	if address is null.

See Also

• SecurityManager.checkConnect(String, int)
• Socket.Socket(java.net.InetAddress, int, java.net.InetAddress, int)

public abstract Socket createSocket (String host, int port, InetAddress localHost, int localPort)

Creates a socket and connects it to the specified remote host on the specified remote port. The socket will also be bound to the local address and port supplied. This socket is configured using the socket options established for this factory.

If there is a security manager, its checkConnect method is called with the host address and port as its arguments. This could result in a SecurityException.

Parameters

host	the server host name with which to connect, or null for the loopback address.
port	the server port
localHost	the local address the socket is bound to
localPort	the local port the socket is bound to

Returns

• the Socket

Throws

IOException	if an I/O error occurs when creating the socket
SecurityException	if a security manager exists and its checkConnect method doesn't allow the operation.
UnknownHostException	if the host is not known
IllegalArgumentException	if the port parameter or localPort parameter is outside the specified range of valid port values, which is between 0 and 65535, inclusive.

See Also

• SecurityManager.checkConnect(String, int)
• Socket.Socket(String, int, java.net.InetAddress, int)

public Socket createSocket ()

Creates an unconnected socket.

Returns

• the unconnected socket

Throws

IOException	if the socket cannot be created

See Also

• Socket.connect(java.net.SocketAddress)
• Socket.connect(java.net.SocketAddress, int)
• Socket.Socket()

public static SocketFactory getDefault ()

Returns a copy of the environment's default socket factory.

Returns

• the default SocketFactory