java.net.DatagramSocket
This class represents a socket for sending and receiving datagram packets.
A datagram socket is the sending or receiving point for a packet delivery service. Each packet sent or received on a datagram socket is individually addressed and routed. Multiple packets sent from one machine to another may be routed differently and arrive in any order.
Where possible, a newly constructed DatagramSocket has the SO_BROADCAST socket option enabled so as to allow the transmission of broadcast datagrams.
In order to receive broadcast packets a DatagramSocket should be bound to the wildcard address. In some implementations, broadcast packets may also be received when a DatagramSocket is bound to a more specific address.
Some methods of DatagramSocket class
DatagramSocket(): This method constructs a datagram socket and binds it to any available port on the local host machine.
DatagramSocket(int): This method constructs a datagram socket and binds it to the specified port on the local host machine.
DatagramSocket(SocketAddress): This method creates a datagram socket, bound to the specified local socket address.
DatagramSocket(int, InetAddress): This method creates a datagram socket, bound to the specified local address.
bind(SocketAddress): This method binds this DatagramSocket to a specific address and port.
connect(SocketAddress): This method connects this socket to a remote socket address (IP address + port number).
connect(InetAddress, int): This method connects the socket to a remote address for this socket. When a socket is connected to a remote address, packets may only be sent to or received from that address.
disconnect(): This method disconnects the socket.
getBroadcast(): This method tests if SO_BROADCAST is enabled.
getChannel(): This method returns the unique java.nio.channels.DatagramChannel object associated with this datagram socket, if any.
getInetAddress(): This method returns the address to which this socket is connected. Returns null if the socket is not connected.
getLocalAddress(): This method gets the local address to which the socket is bound.
getLocalPort(): This method returns the port number on the local host to which this socket is bound.
getLocalSocketAddress(): This method returns the address of the endpoint this socket is bound to.
getOption(SocketOption): This method returns the value of a socket option.
getPort(): This method returns the port number to which this socket is connected.
getReceiveBufferSize(): This method gets the value of the SO_RCVBUF option for this DatagramSocket, which is the buffer size used by the platform for input on this DatagramSocket.
getRemoteSocketAddress(): This method returns the address of the endpoint this socket is connected to, or null if it is unconnected.
getReuseAddress(): This method tests if SO_REUSEADDR is enabled.
getSendBufferSize(): This method gets the value of the SO_SNDBUF option for this DatagramSocket, which is the buffer size used by the platform for output on this DatagramSocket.
getSoTimeout(): This method retrieves the setting for SO_TIMEOUT. 0 returns implies that the option is disabled (i.e., timeout of infinity).
getTrafficClass(): This method gets the traffic class or type-of-service in the IP datagram header for packets sent from this DatagramSocket.
isBound(): This method returns the binding state of the socket.
isClosed(): This method returns whether the socket is closed or not.
isConnected(): This method returns the connection state of the socket.
receive(DatagramPacket): This method receives a datagram packet from this socket.
send(DatagramPacket): This method sends a datagram packet from this socket.
setBroadcast(boolean): This method enables/disables SO_BROADCAST.
DatagramSocket.setDatagramSocketImplFactory(DatagramSocketImplFactory): This method sets the datagram socket implementation factory for the application.
setOption(SocketOption, String): This method sets the value of a socket option.
setReceiveBufferSize(int): This method sets the SO_RCVBUF option to the specified value for this DatagramSocket.
setReuseAddress(boolean): This method enables/disables the SO_REUSEADDR socket option.
setSendBufferSize(int): This method sets the SO_SNDBUF option to the specified value for this DatagramSocket.
setSoTimeout(int): This method enables/disable SO_TIMEOUT with the specified timeout, in milliseconds.
setTrafficClass(int): This method sets the traffic class or type-of-service octet in the IP datagram header for datagrams sent from this DatagramSocket.
supportedOptions(): This method returns a set of the socket options supported by this socket. This method will continue to return the set of options even after the socket has been closed.
Some other classes/interfaces of java.net
DatagramSocket: This class represents a socket for sending and receiving datagram packets.
DatagramSocketImplFactory: This interface defines a factory for datagram socket implementations. It is used by the classes DatagramSocket to create actual socket implementations.
FileNameMap: A simple interface that provides a mechanism to map between a file name and a MIME-type string.
HttpCookie: An HttpCookie object represents an HTTP cookie, which carries the state information between the server and the user agent. A cookie is widely adopted to create stateful sessions.
HttpRetryException: This is thrown to indicate that an HTTP request needs to be retried but cannot be retried automatically, due to streaming mode being enabled.
HttpURLConnection: A URLConnection with support for HTTP-specific features.
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