protected ServerSocketChannel(SelectorProvider provider)

Initializes a new instance of this class.

public static ServerSocketChannel open() throws IOException

Opens a server-socket channel for an Internet protocol socket.

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.

public static ServerSocketChannel open(ProtocolFamily family) throws IOException

Opens a server-socket channel. The family parameter specifies the protocol family of the channel's socket.

The new channel is created by invoking the openServerSocketChannel(ProtocolFamily) method of the system-wide default SelectorProvider object.

public final int validOps()

Returns an operation set identifying this channel's supported operations.

Server-socket channels only support the accepting of new connections, so this method returns SelectionKey.OP_ACCEPT.

public final ServerSocketChannel bind(SocketAddress local) throws IOException

Binds the channel's socket to a local address and configures the socket to listen for connections.

An invocation of this method is equivalent to the following:

public abstract ServerSocketChannel bind(SocketAddress local, int backlog) throws IOException

Binds the channel's socket to a local address and configures the socket to listen for connections.

This method is used to establish an association between the socket and a local address. For Internet protocol sockets, 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 altogether. If the backlog parameter has the value 0, or a negative value, then an implementation specific default is used.

public abstract <T> ServerSocketChannel setOption(SocketOption<T> name, T value) throws IOException

Sets the value of a socket option.

public abstract ServerSocket socket()

Retrieves a server socket associated with this channel.

The returned object will not declare any public methods that are not declared in the ServerSocket class.

public abstract SocketChannel accept() throws IOException

Accepts a connection made to this channel's socket.

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.

If bound to an Internet protocol socket address, 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. If bound to a Unix Domain socket address, this method checks NetPermission("accessUnixDomainSocket").

public abstract SocketAddress getLocalAddress() throws IOException

Returns the socket address that this channel's socket is bound to.

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.

Where the channel is bound to a Unix Domain socket address, the socket address is a UnixDomainSocketAddress. If there is a security manager set, its checkPermission method is called with NetPermission ("accessUnixDomainSocket"). If the operation is not allowed an unnamed UnixDomainSocketAddress is returned.