Class java.net.DatagramSocketImpl - JDK 5 Documentation v1.1.8, Java 2 SDK 英文文档

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Class java.net.DatagramSocketImpl

java.lang.Object
   |
   +----java.net.DatagramSocketImpl

public abstract class DatagramSocketImpl
extends Object
implements SocketOptions

Abstract datagram and multicast socket implementation base class.

fd: The file descriptor object
localPort

DatagramSocketImpl()

bind(int, InetAddress): Binds a datagram socket to a local port and address.
close(): Close the socket.
create(): Creates a datagram socket
getFileDescriptor(): Get the datagram socket file descriptor
getLocalPort(): Get the local port.
getOption(int): Fetch the value of an option.
getTTL(): Retrieve the TTL (time-to-live) option.
join(InetAddress): Join the multicast group.
leave(InetAddress): Leave the multicast group.
peek(InetAddress): Peek at the packet to see who it is from.
receive(DatagramPacket): Receive the datagram packet.
send(DatagramPacket): Sends a datagram packet.
setOption(int, Object): Enable/disable the option specified by optID.
setTTL(byte): Set the TTL (time-to-live) option.

localPort

 protected int localPort

 protected FileDescriptor fd

The file descriptor object

DatagramSocketImpl

 public DatagramSocketImpl()

create

 protected abstract void create() throws SocketException

Creates a datagram socket

bind

 protected abstract void bind(int lport,
                              InetAddress laddr) throws SocketException

Binds a datagram socket to a local port and address.

send

 protected abstract void send(DatagramPacket p) throws IOException

Sends a datagram packet. The packet contains the data and the destination address to send the packet to.

Parameters:: packet - to be sent.

peek

 protected abstract int peek(InetAddress i) throws IOException

Peek at the packet to see who it is from.

Parameters:: return - the address which the packet came from.

receive

 protected abstract void receive(DatagramPacket p) throws IOException

Receive the datagram packet.

Parameters:: Packet - Received.

setTTL

 protected abstract void setTTL(byte ttl) throws IOException

Set the TTL (time-to-live) option.

Parameters:: TTL - to be set.

getTTL

 protected abstract byte getTTL() throws IOException

Retrieve the TTL (time-to-live) option.

join

 protected abstract void join(InetAddress inetaddr) throws IOException

Join the multicast group.

Parameters:: multicast - address to join.

leave

 protected abstract void leave(InetAddress inetaddr) throws IOException

Leave the multicast group.

Parameters:: multicast - address to leave.

close

 protected abstract void close()

Close the socket.

getLocalPort

 protected int getLocalPort()

Get the local port.

getFileDescriptor

 protected FileDescriptor getFileDescriptor()

Get the datagram socket file descriptor

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