public abstract class ServerSocketChannel extends AbstractSelectableChannel implements NetworkChannel
A server-socket channel is created by invoking the open
method of this class. It is not possible to create a channel for an arbitrary,
pre-existing ServerSocket. A newly-created server-socket channel is
open but not yet bound. An attempt to invoke the accept
method of an unbound server-socket channel will cause a NotYetBoundException
to be thrown. A server-socket channel can be bound by invoking one of the
bind methods defined by this class.
Socket options are configured using the setOption method. Server-socket channels support the following options:
Additional (implementation specific) options may also be supported.
Option Name Description SO_RCVBUFThe size of the socket receive buffer SO_REUSEADDRRe-use address
Server-socket channels are safe for use by multiple concurrent threads.
| Modifier | Constructor and Description |
|---|---|
protected |
ServerSocketChannel(SelectorProvider provider)
Initializes a new instance of this class.
|
| Modifier and Type | Method and Description |
|---|---|
abstract SocketChannel |
accept()
Accepts a connection made to this channel's socket.
|
ServerSocketChannel |
bind(SocketAddress local)
Binds the channel's socket to a local address and configures the socket
to listen for connections.
|
abstract ServerSocketChannel |
bind(SocketAddress local,
int backlog)
Binds the channel's socket to a local address and configures the socket to
listen for connections.
|
abstract SocketAddress |
getLocalAddress()
Returns the socket address that this channel's socket is bound to.
|
static ServerSocketChannel |
open()
Opens a server-socket channel.
|
abstract <T> ServerSocketChannel |
setOption(SocketOption<T> name,
T value)
Sets the value of a socket option.
|
abstract ServerSocket |
socket()
Retrieves a server socket associated with this channel.
|
int |
validOps()
Returns an operation set identifying this channel's supported
operations.
|
blockingLock, configureBlocking, implCloseChannel, implCloseSelectableChannel, implConfigureBlocking, isBlocking, isRegistered, keyFor, provider, registerregisterbegin, close, end, isOpenclone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, waitgetOption, supportedOptionsprotected ServerSocketChannel(SelectorProvider provider)
provider - The provider that created this channelpublic static ServerSocketChannel open() throws IOException
The new channel is created by invoking the openServerSocketChannel method of the system-wide default SelectorProvider object.
The new channel's socket is initially unbound; it must be bound to a
specific address via one of its socket's bind methods before
connections can be accepted.
IOException - If an I/O error occurspublic final int validOps()
Server-socket channels only support the accepting of new
connections, so this method returns SelectionKey.OP_ACCEPT.
validOps in class SelectableChannelpublic final ServerSocketChannel bind(SocketAddress local) throws IOException
An invocation of this method is equivalent to the following:
bind(local, 0);
bind in interface NetworkChannellocal - The local address to bind the socket, or null to bind
to an automatically assigned socket addressAlreadyBoundException - If the socket is already boundUnsupportedAddressTypeException - If the type of the given address is not supportedClosedChannelException - If the channel is closedIOException - If some other I/O error occursSecurityException - If a security manager has been installed and its checkListen method denies the
operationNetworkChannel.getLocalAddress()public abstract ServerSocketChannel bind(SocketAddress local, int backlog) throws IOException
This method is used to establish an association between the socket and a local address. Once an association is established then the socket remains bound until the channel is closed.
The backlog parameter is the maximum number of pending
connections on the socket. Its exact semantics are implementation specific.
In particular, an implementation may impose a maximum length or may choose
to ignore the parameter altogther. If the backlog parameter has
the value 0, or a negative value, then an implementation specific
default is used.
local - The address to bind the socket, or null to bind to an
automatically assigned socket addressbacklog - The maximum number of pending connectionsAlreadyBoundException - If the socket is already boundUnsupportedAddressTypeException - If the type of the given address is not supportedClosedChannelException - If this channel is closedIOException - If some other I/O error occursSecurityException - If a security manager has been installed and its checkListen method denies the
operationpublic abstract <T> ServerSocketChannel setOption(SocketOption<T> name, T value) throws IOException
NetworkChannelsetOption in interface NetworkChannelT - The type of the socket option valuename - The socket optionvalue - The value of the socket option. A value of null may be
a valid value for some socket options.UnsupportedOperationException - If the socket option is not supported by this channelIllegalArgumentException - If the value is not a valid value for this socket optionClosedChannelException - If this channel is closedIOException - If an I/O error occursStandardSocketOptionspublic abstract ServerSocket socket()
The returned object will not declare any public methods that are not
declared in the ServerSocket class.
public abstract SocketChannel accept() throws IOException
If this channel is in non-blocking mode then this method will immediately return null if there are no pending connections. Otherwise it will block indefinitely until a new connection is available or an I/O error occurs.
The socket channel returned by this method, if any, will be in blocking mode regardless of the blocking mode of this channel.
This method performs exactly the same security checks as the accept method of the ServerSocket class. That is, if a security manager has been
installed then for each new connection this method verifies that the
address and port number of the connection's remote endpoint are
permitted by the security manager's checkAccept method.
ClosedChannelException - If this channel is closedAsynchronousCloseException - If another thread closes this channel
while the accept operation is in progressClosedByInterruptException - If another thread interrupts the current thread
while the accept operation is in progress, thereby
closing the channel and setting the current thread's
interrupt statusNotYetBoundException - If this channel's socket has not yet been boundSecurityException - If a security manager has been installed
and it does not permit access to the remote endpoint
of the new connectionIOException - If some other I/O error occurspublic abstract SocketAddress getLocalAddress() throws IOException
Where the channel is bound to an Internet Protocol
socket address then the return value from this method is of type InetSocketAddress.
If there is a security manager set, its checkConnect method is
called with the local address and -1 as its arguments to see
if the operation is allowed. If the operation is not allowed,
a SocketAddress representing the
loopback address and the
local port of the channel's socket is returned.
getLocalAddress in interface NetworkChannelSocketAddress that the socket is bound to, or the
SocketAddress representing the loopback address if
denied by the security manager, or null if the
channel's socket is not boundClosedChannelException - If the channel is closedIOException - If an I/O error occurs Submit a bug or feature
For further API reference and developer documentation, see Java SE Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.
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