- All Implemented Interfaces:
- Closeable,- AutoCloseable,- Channel,- InterruptibleChannel,- NetworkChannel
 A server-socket channel is created by invoking one of the open
 methods of this class. The no-arg open method opens a server-socket
 channel for an Internet protocol socket. The open(ProtocolFamily)
 method is used to open a server-socket channel for a socket of a specified
 protocol family. It is not possible to create a channel for an arbitrary,
 pre-existing socket. 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 for Internet protocol sockets
 support the following options:
 
Option Name Description SO_RCVBUFThe size of the socket receive buffer SO_REUSEADDRRe-use address 
Server-socket channels for Unix domain sockets support:
Option Name Description SO_RCVBUFThe size of the socket receive buffer 
Additional (implementation specific) options may also be supported.
Server-socket channels are safe for use by multiple concurrent threads.
- Since:
- 1.4
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Constructor SummaryConstructorsModifierConstructorDescriptionprotectedServerSocketChannel(SelectorProvider provider) Initializes a new instance of this class.
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Method SummaryModifier and TypeMethodDescriptionabstract SocketChannelaccept()Accepts a connection made to this channel's socket.final ServerSocketChannelbind(SocketAddress local) Binds the channel's socket to a local address and configures the socket to listen for connections.abstract ServerSocketChannelbind(SocketAddress local, int backlog) Binds the channel's socket to a local address and configures the socket to listen for connections.abstract SocketAddressReturns the socket address that this channel's socket is bound to.static ServerSocketChannelopen()Opens a server-socket channel for an Internet protocol socket.static ServerSocketChannelopen(ProtocolFamily family) Opens a server-socket channel.abstract <T> ServerSocketChannelsetOption(SocketOption<T> name, T value) Sets the value of a socket option.abstract ServerSocketsocket()Retrieves a server socket associated with this channel.final intvalidOps()Returns an operation set identifying this channel's supported operations.Methods declared in class java.nio.channels.spi.AbstractSelectableChannelblockingLock, configureBlocking, implCloseChannel, implCloseSelectableChannel, implConfigureBlocking, isBlocking, isRegistered, keyFor, provider, registerMethods declared in class java.nio.channels.SelectableChannelregisterMethods declared in class java.nio.channels.spi.AbstractInterruptibleChannelbegin, close, end, isOpenMethods declared in class java.lang.Objectclone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, waitMethods declared in interface java.nio.channels.NetworkChannelgetOption, supportedOptions
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Constructor Details- 
ServerSocketChannelInitializes a new instance of this class.- Parameters:
- provider- The provider that created this channel
 
 
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Method Details- 
openOpens a server-socket channel for an Internet protocol socket.The new channel is created by invoking the openServerSocketChannelmethod of the system-wide defaultSelectorProviderobject.The new channel's socket is initially unbound; it must be bound to a specific address via one of its socket's bindmethods before connections can be accepted.- Returns:
- A new socket channel
- Throws:
- IOException- If an I/O error occurs
- See Also:
 
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openOpens a server-socket channel. Thefamilyparameter specifies theprotocol familyof the channel's socket.The new channel is created by invoking the openServerSocketChannel(ProtocolFamily)method of the system-wide defaultSelectorProviderobject.- Parameters:
- family- The protocol family
- Returns:
- A new socket channel
- Throws:
- UnsupportedOperationException- If the specified protocol family is not supported. For example, suppose the parameter is specified as- StandardProtocolFamily.INET6but IPv6 is not enabled on the platform.
- IOException- If an I/O error occurs
- Since:
- 15
- See Also:
 
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validOpspublic 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.- Specified by:
- validOpsin class- SelectableChannel
- Returns:
- The valid-operation set
 
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bindBinds 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: bind(local, 0);- Specified by:
- bindin interface- NetworkChannel
- Parameters:
- local- The local address to bind the socket, or- nullto bind to an automatically assigned socket address
- Returns:
- This channel
- Throws:
- AlreadyBoundException- If the socket is already bound
- UnsupportedAddressTypeException- If the type of the given address is not supported
- ClosedChannelException- If the channel is closed
- IOException- If some other I/O error occurs
- SecurityException- If a security manager has been installed and it denies the operation
- Since:
- 1.7
- See Also:
 
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bindBinds 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 backlogparameter 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 thebacklogparameter has the value0, or a negative value, then an implementation specific default is used.- API Note:
- Binding a server socket channel for a Unix Domain socket, creates a
 file corresponding to the file path in the UnixDomainSocketAddress. This file persists after the channel is closed, and must be removed before another socket can bind to the same name. Binding to anulladdress causes the socket to be automatically bound to some unique file in a system temporary location. The associated socket file also persists after the channel is closed. Its name can be obtained from the channel's local socket address.
- Implementation Note:
- Each platform enforces an implementation specific, maximum length for the name of a Unix Domain socket. This limitation is enforced when a channel is bound. The maximum length is typically close to and generally not less than 100 bytes. This limitation also applies to automatically bound server socket channels. See the Unix domain networking properties that can be used to select the temporary directory where these sockets are created.
- Parameters:
- local- The address to bind the socket, or- nullto bind to an automatically assigned socket address
- backlog- The maximum number of pending connections
- Returns:
- This channel
- Throws:
- AlreadyBoundException- If the socket is already bound
- UnsupportedAddressTypeException- If the type of the given address is not supported
- ClosedChannelException- If this channel is closed
- IOException- If some other I/O error occurs
- SecurityException- If a security manager has been installed and its- checkListenmethod denies the operation for an Internet protocol socket address, or for a Unix domain socket address if it denies- NetPermission- ("accessUnixDomainSocket").
- Since:
- 1.7
 
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setOptionDescription copied from interface:NetworkChannelSets the value of a socket option.- Specified by:
- setOptionin interface- NetworkChannel
- Type Parameters:
- T- The type of the socket option value
- Parameters:
- name- The socket option
- value- The value of the socket option. A value of- nullmay be a valid value for some socket options.
- Returns:
- This channel
- Throws:
- UnsupportedOperationException- If the socket option is not supported by this channel
- IllegalArgumentException- If the value is not a valid value for this socket option
- ClosedChannelException- If this channel is closed
- IOException- If an I/O error occurs
- Since:
- 1.7
- See Also:
 
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socketRetrieves a server socket associated with this channel.The returned object will not declare any public methods that are not declared in the ServerSocketclass.- Returns:
- A server socket associated with this channel
- Throws:
- UnsupportedOperationException- If the channel's socket is not an Internet protocol socket
 
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acceptAccepts a connection made to this channel's socket.If this channel is in non-blocking mode then this method will immediately return nullif 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 acceptmethod of theServerSocketclass. 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'scheckAcceptmethod. If bound to a Unix Domain socket address, this method checksNetPermission("accessUnixDomainSocket").- Returns:
- The socket channel for the new connection,
          or nullif this channel is in non-blocking mode and no connection is available to be accepted
- Throws:
- ClosedChannelException- If this channel is closed
- AsynchronousCloseException- If another thread closes this channel while the accept operation is in progress
- ClosedByInterruptException- 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 status
- NotYetBoundException- If this channel's socket has not yet been bound
- SecurityException- If a security manager has been installed and this channel is bound to an- InetSocketAddressand the security manager denies access to the remote endpoint of the new connection, or if this channel is bound to a- UnixDomainSocketAddressand the security manager denies- NetPermission- ("accessUnixDomainSocket")
- IOException- If some other I/O error occurs
 
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getLocalAddressReturns the socket address that this channel's socket is bound to.Where the channel is boundto an Internet Protocol socket address then the return value from this method is of typeInetSocketAddress. If there is a security manager set, itscheckConnectmethod is called with the local address and-1as its arguments to see if the operation is allowed. If the operation is not allowed, aSocketAddressrepresenting theloopbackaddress 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, itscheckPermissionmethod is called withNetPermission("accessUnixDomainSocket"). If the operation is not allowed an unnamedUnixDomainSocketAddressis returned.- Specified by:
- getLocalAddressin interface- NetworkChannel
- Returns:
- The SocketAddressthat the socket is bound to, or theSocketAddressrepresenting the loopback address or empty path if denied by the security manager, ornullif the channel's socket is not bound
- Throws:
- ClosedChannelException- If the channel is closed
- IOException- If an I/O error occurs
 
 
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