SocketFactory (Java SE 15 & JDK 15) (original) (raw)

Direct Known Subclasses:

[SSLSocketFactory](ssl/SSLSocketFactory.html "class in javax.net.ssl")

public abstract class SocketFactory extends Object

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.

Since:

1.4

See Also:

ServerSocketFactory

• Constructor Summary

Constructors

• Method Summary

Methods declared in class java.lang.Object

[clone](../../java/lang/Object.html#clone%28%29), [equals](../../java/lang/Object.html#equals%28java.lang.Object%29), [finalize](../../java/lang/Object.html#finalize%28%29), [getClass](../../java/lang/Object.html#getClass%28%29), [hashCode](../../java/lang/Object.html#hashCode%28%29), [notify](../../java/lang/Object.html#notify%28%29), [notifyAll](../../java/lang/Object.html#notifyAll%28%29), [toString](../../java/lang/Object.html#toString%28%29), [wait](../../java/lang/Object.html#wait%28%29), [wait](../../java/lang/Object.html#wait%28long%29), [wait](../../java/lang/Object.html#wait%28long,int%29)

• Constructor Details

  • SocketFactory

  protected SocketFactory()
  Creates a SocketFactory.

• Method Details

  • getDefault

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

  • createSocket

  Creates an unconnected socket.
  Returns:
  the unconnected socket
  Throws:
  [IOException](../../java/io/IOException.html "class in java.io") - if the socket cannot be created
  See Also:
  Socket.connect(java.net.SocketAddress), Socket.connect(java.net.SocketAddress, int), Socket()

  • createSocket

  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, ornull for the loopback address.
  port - the server port
  Returns:
  the Socket
  Throws:
  [IOException](../../java/io/IOException.html "class in java.io") - if an I/O error occurs when creating the socket
  [SecurityException](../../java/lang/SecurityException.html "class in java.lang") - if a security manager exists and itscheckConnect method doesn't allow the operation.
  [UnknownHostException](../../java/net/UnknownHostException.html "class in java.net") - if the host is not known
  [IllegalArgumentException](../../java/lang/IllegalArgumentException.html "class in java.lang") - if the port parameter is outside the specified range of valid port values, which is between 0 and 65535, inclusive.
  See Also:
  SecurityManager.checkConnect(java.lang.String, int), Socket(String, int)

  • createSocket

  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, ornull 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](../../java/io/IOException.html "class in java.io") - if an I/O error occurs when creating the socket
  [SecurityException](../../java/lang/SecurityException.html "class in java.lang") - if a security manager exists and itscheckConnect method doesn't allow the operation.
  [UnknownHostException](../../java/net/UnknownHostException.html "class in java.net") - if the host is not known
  [IllegalArgumentException](../../java/lang/IllegalArgumentException.html "class in java.lang") - 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(java.lang.String, int), Socket(String, int, java.net.InetAddress, int)

  • createSocket

  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](../../java/io/IOException.html "class in java.io") - if an I/O error occurs when creating the socket
  [SecurityException](../../java/lang/SecurityException.html "class in java.lang") - if a security manager exists and itscheckConnect method doesn't allow the operation.
  [IllegalArgumentException](../../java/lang/IllegalArgumentException.html "class in java.lang") - if the port parameter is outside the specified range of valid port values, which is between 0 and 65535, inclusive.
  [NullPointerException](../../java/lang/NullPointerException.html "class in java.lang") - if host is null.
  See Also:
  SecurityManager.checkConnect(java.lang.String, int), Socket(java.net.InetAddress, int)

  • createSocket

  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](../../java/io/IOException.html "class in java.io") - if an I/O error occurs when creating the socket
  [SecurityException](../../java/lang/SecurityException.html "class in java.lang") - if a security manager exists and itscheckConnect method doesn't allow the operation.
  [IllegalArgumentException](../../java/lang/IllegalArgumentException.html "class in java.lang") - if the port parameter or localPort parameter is outside the specified range of valid port values, which is between 0 and 65535, inclusive.
  [NullPointerException](../../java/lang/NullPointerException.html "class in java.lang") - if address is null.
  See Also:
  SecurityManager.checkConnect(java.lang.String, int), Socket(java.net.InetAddress, int, java.net.InetAddress, int)