SocketFactory

public abstract class SocketFactory extends Object
Known Direct Subclasses

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.

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

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.

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.

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.

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 add