java.lang.Object | |
↳ | java.net.SocketImpl |
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.
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Inherited Constants | |||||||||||
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From interface
java.net.SocketOptions
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Fields | |||||||||||
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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. |
Public Constructors | |||||||||||
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Public Methods | |||||||||||
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Returns the address and port of this socket as a
String . |
Protected Methods | |||||||||||
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Accepts a connection.
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Returns the number of bytes that can be read from this socket
without blocking.
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Binds this socket to the specified local IP address and port number.
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Closes this socket.
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Connects this socket to the specified port number on the specified host.
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Connects this socket to the specified port number on the specified host.
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Connects this socket to the specified port on the named host.
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Creates either a stream or a datagram socket.
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Returns the value of this socket's
fd field. | |||||||||||
Returns the value of this socket's
address field. | |||||||||||
Returns an input stream for this socket.
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Returns the value of this socket's
localport field. | |||||||||||
Returns an output stream for this socket.
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Returns the value of this socket's
port field. | |||||||||||
Sets the maximum queue length for incoming connection indications
(a request to connect) to the
count argument. | |||||||||||
Send one byte of urgent data on the socket.
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Sets performance preferences for this socket.
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Places the input stream for this socket at "end of stream".
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Disables the output stream for this socket.
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Returns whether or not this SocketImpl supports sending
urgent data.
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Inherited Methods | |||||||||||
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From class
java.lang.Object
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From interface
java.net.SocketOptions
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The file descriptor object for this socket.
The local port number to which this socket is connected.
The port number on the remote host to which this socket is connected.
Returns the address and port of this socket as a String
.
Accepts a connection.
s | the accepted connection. |
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IOException | if an I/O error occurs when accepting the connection. |
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Returns the number of bytes that can be read from this socket without blocking.
IOException | if an I/O error occurs when determining the number of bytes available. |
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Binds this socket to the specified local IP address and port number.
host | an IP address that belongs to a local interface. |
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port | the port number. |
IOException | if an I/O error occurs when binding this socket. |
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Closes this socket.
IOException | if an I/O error occurs when closing this socket. |
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Connects this socket to the specified port number on the specified host.
address | the IP address of the remote host. |
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port | the port number. |
IOException | if an I/O error occurs when attempting a connection. |
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Connects this socket to the specified port number on the specified host. A timeout of zero is interpreted as an infinite timeout. The connection will then block until established or an error occurs.
address | the Socket address of the remote host. |
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timeout | the timeout value, in milliseconds, or zero for no timeout. |
IOException | if an I/O error occurs when attempting a connection. |
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Connects this socket to the specified port on the named host.
host | the name of the remote host. |
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port | the port number. |
IOException | if an I/O error occurs when connecting to the remote host. |
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Creates either a stream or a datagram socket.
stream | if true , create a stream socket;
otherwise, create a datagram socket. |
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IOException | if an I/O error occurs while creating the socket. |
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Returns the value of this socket's fd
field.
fd
field.Returns the value of this socket's address
field.
address
field.Returns an input stream for this socket.
IOException | if an I/O error occurs when creating the input stream. |
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Returns the value of this socket's localport
field.
localport
field.Returns an output stream for this socket.
IOException | if an I/O error occurs when creating the output stream. |
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Returns the value of this socket's port
field.
port
field.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.
backlog | the maximum length of the queue. |
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IOException | if an I/O error occurs when creating the queue. |
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Send one byte of urgent data on the socket. The byte to be sent is the low eight bits of the parameter
data | The byte of data to send |
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IOException | if there is an error sending the data. |
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Sets performance preferences for this socket.
Sockets use the TCP/IP protocol by default. Some implementations may offer alternative protocols which have different performance characteristics than TCP/IP. This method allows the application to express its own preferences as to how these tradeoffs should be made when the implementation chooses from the available protocols.
Performance preferences are described by three integers whose values indicate the relative importance of short connection time, low latency, and high bandwidth. The absolute values of the integers are irrelevant; in order to choose a protocol the values are simply compared, with larger values indicating stronger preferences. Negative values represent a lower priority than positive values. If the application prefers short connection time over both low latency and high bandwidth, for example, then it could invoke this method with the values (1, 0, 0). If the application prefers high bandwidth above low latency, and low latency above short connection time, then it could invoke this method with the values (0, 1, 2). By default, this method does nothing, unless it is overridden in a a sub-class.
connectionTime | An int expressing the relative importance of a short connection time |
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latency | An int expressing the relative importance of low latency |
bandwidth | An int expressing the relative importance of high bandwidth |
Places the input stream for this socket at "end of stream". Any data sent to this socket is acknowledged and then silently discarded. If you read from a socket input stream after invoking shutdownInput() on the socket, the stream will return EOF.
IOException | if an I/O error occurs when shutting down this socket. |
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Disables the output stream for this socket. For a TCP socket, any previously written data will be sent followed by TCP's normal connection termination sequence. If you write to a socket output stream after invoking shutdownOutput() on the socket, the stream will throw an IOException.
IOException | if an I/O error occurs when shutting down this socket. |
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Returns whether or not this SocketImpl supports sending urgent data. By default, false is returned unless the method is overridden in a sub-class