Class java.net.SocketImpl - JDK 5 Documentation v1.1.8, Java 2 SDK 英文文档

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Class java.net.SocketImpl

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

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.

address: The IP address of the remote end of this socket.
fd: The file descriptor object for this socket.
localport: The local port number to which this socket is connected.
port: The port number on the remote host to which this socket is connected.

SocketImpl()

accept(SocketImpl): Accepts a connection.
available(): Returns the number of bytes that can be read from this socket without blocking.
bind(InetAddress, int): Binds this socket to the specified port number on the specified host.
close(): Closes this socket.
connect(InetAddress, int): Connects this socket to the specified port number on the specified host.
connect(String, int): Connects this socket to the specified port on the named host.
create(boolean): Creates either a stream or a datagram socket.
getFileDescriptor(): Returns the value of this socket's fd field.
getInetAddress(): Returns the value of this socket's address field.
getInputStream(): Returns an input stream for this socket.
getLocalPort(): Returns the value of this socket's localport field.
getOption(int): Fetch the value of an option.
getOutputStream(): Returns an output stream for this socket.
getPort(): Returns the value of this socket's port field.
listen(int): Sets the maximum queue length for incoming connection indications (a request to connect) to the count argument.
setOption(int, Object): Enable/disable the option specified by optID.
toString(): Returns the address and port of this socket as a String.

 protected FileDescriptor fd

The file descriptor object for this socket.

address

 protected InetAddress address

The IP address of the remote end of this socket.

port

 protected int port

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

localport

 protected int localport

The local port number to which this socket is connected.

SocketImpl

 public SocketImpl()

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.

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.

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.

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.

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.

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.

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.

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.

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.

close

 protected abstract void close() throws IOException

Closes this socket.

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

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

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

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

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

toString

 public String toString()

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

Returns:: a string representation of this socket.
Overrides:: toString in class Object

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