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Java(TM) 2 Platform, Standard Edition, v1.2.2 API Specification: Class SocketImpl - JDK 5 Documentation v1.2.2, Java 2 SDK 英文文档

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java.net
Class SocketImpl

java.lang.Object
  |
  +--java.net.SocketImpl

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public abstract class SocketImpl

extends Object

implements SocketOptions

The abstract class SocketImpl is a common superclass of all classes that actually implement sockets. It is used to create both client and server sockets.

A "plain" socket implements these methods exactly as described, without attempting to go through a firewall or proxy.

Since:

JDK1.0

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Field Summary
protected  InetAddress	address           The IP address of the remote end of this socket.
protected  FileDescriptor	fd           The file descriptor object for this socket.
protected  int	localport           The local port number to which this socket is connected.
protected  int	port           The port number on the remote host to which this socket is connected.

 

Fields inherited from interface java.net.SocketOptions

IP_MULTICAST_IF, SO_BINDADDR, SO_LINGER, SO_RCVBUF, SO_REUSEADDR, SO_SNDBUF, SO_TIMEOUT, TCP_NODELAY

 

Constructor Summary

SocketImpl()

 

Method Summary
protected abstract  void	accept(SocketImpl s)           Accepts a connection.
protected abstract  int	available()           Returns the number of bytes that can be read from this socket without blocking.
protected abstract  void	bind(InetAddress host, int port)           Binds this socket to the specified port number on the specified host.
protected abstract  void	close()           Closes this socket.
protected abstract  void	connect(InetAddress address, int port)           Connects this socket to the specified port number on the specified host.
protected abstract  void	connect(String host, int port)           Connects this socket to the specified port on the named host.
protected abstract  void	create(boolean stream)           Creates either a stream or a datagram socket.
protected  FileDescriptor	getFileDescriptor()           Returns the value of this socket's fd field.
protected  InetAddress	getInetAddress()           Returns the value of this socket's address field.
protected abstract  InputStream	getInputStream()           Returns an input stream for this socket.
protected  int	getLocalPort()           Returns the value of this socket's localport field.
protected abstract  OutputStream	getOutputStream()           Returns an output stream for this socket.
protected  int	getPort()           Returns the value of this socket's port field.
protected abstract  void	listen(int backlog)           Sets the maximum queue length for incoming connection indications (a request to connect) to the count argument.
String	toString()           Returns the address and port of this socket as a String.

 

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

 

Field Detail

fd

protected FileDescriptor fd

The file descriptor object for this socket.

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address

protected InetAddress address

The IP address of the remote end of this socket.

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port

protected int port

The port number on the remote host to which this socket is connected.

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localport

protected int localport

The local port number to which this socket is connected.

Constructor Detail

SocketImpl

public SocketImpl()

Method Detail

create

protected abstract void create(boolean stream)
                        throws IOException

Creates either a stream or a datagram socket.

Parameters:

stream - if true, create a stream socket; otherwise, create a datagram socket.

Throws:

IOException - if an I/O error occurs while creating the socket.

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connect

protected abstract void connect(String host,
                                int port)
                         throws IOException

Connects this socket to the specified port on the named host.

Parameters:

host - the name of the remote host.

port - the port number.

Throws:

IOException - if an I/O error occurs when connecting to the remote host.

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connect

protected abstract void connect(InetAddress address,
                                int port)
                         throws IOException

Connects this socket to the specified port number on the specified host.

Parameters:

address - the IP address of the remote host.

port - the port number.

Throws:

IOException - if an I/O error occurs when attempting a connection.

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bind

protected abstract void bind(InetAddress host,
                             int port)
                      throws IOException

Binds this socket to the specified port number on the specified host.

Parameters:

host - the IP address of the remote host.

port - the port number.

Throws:

IOException - if an I/O error occurs when binding this socket.

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listen

protected abstract void listen(int backlog)
                        throws IOException

Sets the maximum queue length for incoming connection indications (a request to connect) to the count argument. If a connection indication arrives when the queue is full, the connection is refused.

Parameters:

backlog - the maximum length of the queue.

Throws:

IOException - if an I/O error occurs when creating the queue.

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accept

protected abstract void accept(SocketImpl s)
                        throws IOException

Accepts a connection.

Parameters:

s - the accepted connection.

Throws:

IOException - if an I/O error occurs when accepting the connection.

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getInputStream

protected abstract InputStream getInputStream()
                                       throws IOException

Returns an input stream for this socket.

Returns:

a stream for reading from this socket.

Throws:

IOException - if an I/O error occurs when creating the input stream.

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getOutputStream

protected abstract OutputStream getOutputStream()
                                         throws IOException

Returns an output stream for this socket.

Returns:

an output stream for writing to this socket.

Throws:

IOException - if an I/O error occurs when creating the output stream.

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available

protected abstract int available()
                          throws IOException

Returns the number of bytes that can be read from this socket without blocking.

Returns:

the number of bytes that can be read from this socket without blocking.

Throws:

IOException - if an I/O error occurs when determining the number of bytes available.

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close

protected abstract void close()
                       throws IOException

Closes this socket.

Throws:

IOException - if an I/O error occurs when closing this socket.

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getFileDescriptor

protected FileDescriptor getFileDescriptor()

Returns the value of this socket's fd field.

Returns:

the value of this socket's fd field.

See Also:

fd

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getInetAddress

protected InetAddress getInetAddress()

Returns the value of this socket's address field.

Returns:

the value of this socket's address field.

See Also:

address

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getPort

protected int getPort()

Returns the value of this socket's port field.

Returns:

the value of this socket's port field.

See Also:

port

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getLocalPort

protected int getLocalPort()

Returns the value of this socket's localport field.

Returns:

the value of this socket's localport field.

See Also:

localport

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toString

public String toString()

Returns the address and port of this socket as a String.

Overrides:

toString in class Object

Returns:

a string representation of this socket.

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