Summary: Ctors | Methods | Inherited Methods | [Expand All]

Since: API Level 1

public class

MulticastSocket

extends DatagramSocket

java.lang.Object
↳	java.net.DatagramSocket
	↳	java.net.MulticastSocket

Class Overview

This class implements a multicast socket for sending and receiving IP multicast datagram packets.

Summary

Public Constructors
	MulticastSocket() Constructs a multicast socket, bound to any available port on the localhost.
	MulticastSocket(int aPort) Constructs a multicast socket, bound to the specified port on the localhost.
	MulticastSocket(SocketAddress localAddr) Constructs a `MulticastSocket` bound to the host/port specified by the `SocketAddress`, or an unbound `DatagramSocket` if the `SocketAddress` is `null`.

Public Methods
InetAddress	getInterface() Gets the network address used by this socket.
boolean	getLoopbackMode() Gets the state of the `SocketOptions.IP_MULTICAST_LOOP`.
NetworkInterface	getNetworkInterface() Gets the network interface used by this socket.
byte	getTTL() This method is deprecated. Replaced by `getTimeToLive()`
int	getTimeToLive() Gets the time-to-live (TTL) for multicast packets sent on this socket.
void	joinGroup(SocketAddress groupAddress, NetworkInterface netInterface) Adds this socket to the specified multicast group.
void	joinGroup(InetAddress groupAddr) Adds this socket to the specified multicast group.
void	leaveGroup(SocketAddress groupAddress, NetworkInterface netInterface) Removes this socket from the specified multicast group.
void	leaveGroup(InetAddress groupAddr) Removes this socket from the specified multicast group.
void	send(DatagramPacket pack, byte ttl) This method is deprecated. use `setTimeToLive(int)`.
void	setInterface(InetAddress addr) Sets the interface address used by this socket.
void	setLoopbackMode(boolean disable) Sets the `IP_MULTICAST_LOOP`.
void	setNetworkInterface(NetworkInterface netInterface) Sets the network interface used by this socket.
void	setTTL(byte ttl) This method is deprecated. Replaced by `setTimeToLive(int)`
void	setTimeToLive(int ttl) Sets the time-to-live (TTL) for multicast packets sent on this socket.

[Expand]

Inherited Methods

From class java.net.DatagramSocket

void	bind(SocketAddress localAddr) Binds this socket to the local address and port specified by `localAddr`.
void	close() Closes this UDP datagram socket and all possibly associated channels.
void	connect(SocketAddress remoteAddr) Connects this datagram socket to the remote host and port specified by `remoteAddr`.
void	connect(InetAddress anAddress, int aPort) Connects this UDP datagram socket to the specific target host with the address `anAdress` on port `aPort`.
void	disconnect() Disconnects this UDP datagram socket from the remote host.
boolean	getBroadcast() Gets the state of the socket option `SocketOptions.SO_BROADCAST`.
DatagramChannel	getChannel() Returns this socket's `DatagramChannel`, if one exists.
InetAddress	getInetAddress() Gets the `InetAddress` instance representing the remote address to which this UDP datagram socket is connected.
InetAddress	getLocalAddress() Gets the `InetAddress` instance representing the bound local address of this UDP datagram socket.
int	getLocalPort() Gets the local port which this socket is bound to.
SocketAddress	getLocalSocketAddress() Gets the bound local address and port of this socket.
int	getPort() Gets the remote port which this socket is connected to.
synchronized int	getReceiveBufferSize() Returns this socket's `receive buffer size`.
SocketAddress	getRemoteSocketAddress() Gets the address and port of the connected remote host.
boolean	getReuseAddress() Gets the state of the socket option `SocketOptions.SO_REUSEADDR`.
synchronized int	getSendBufferSize() Returns this socket's `send buffer size`.
synchronized int	getSoTimeout() Gets the socket `receive timeout`.
int	getTrafficClass() Returns this socket's setting.
boolean	isBound() Determines whether the socket is bound to an address or not.
boolean	isClosed() Gets the state of this socket.
boolean	isConnected() Determines whether the socket is connected to a target host.
synchronized void	receive(DatagramPacket pack) Receives a packet from this socket and stores it in the argument `pack`.
void	send(DatagramPacket pack) Sends a packet over this socket.
void	setBroadcast(boolean broadcast) Sets the socket option `SocketOptions.SO_BROADCAST`.
synchronized static void	setDatagramSocketImplFactory(DatagramSocketImplFactory fac) Sets the socket implementation factory.
synchronized void	setReceiveBufferSize(int size) Sets this socket's `receive buffer size`.
void	setReuseAddress(boolean reuse) Sets the socket option `SocketOptions.SO_REUSEADDR`.
synchronized void	setSendBufferSize(int size) Sets this socket's `send buffer size`.
synchronized void	setSoTimeout(int timeout) Sets the `read timeout` in milliseconds for this socket.
void	setTrafficClass(int value) Sets the value for every packet sent by this socket.

From class java.lang.Object

Object	clone() Creates and returns a copy of this `Object`.
boolean	equals(Object o) Compares this instance with the specified object and indicates if they are equal.
void	finalize() Called before the object's memory is reclaimed by the VM.
final Class<?>	getClass() Returns the unique instance of `Class` that represents this object's class.
int	hashCode() Returns an integer hash code for this object.
final void	notify() Causes a thread which is waiting on this object's monitor (by means of calling one of the `wait()` methods) to be woken up.
final void	notifyAll() Causes all threads which are waiting on this object's monitor (by means of calling one of the `wait()` methods) to be woken up.
String	toString() Returns a string containing a concise, human-readable description of this object.
final void	wait() Causes the calling thread to wait until another thread calls the `notify()` or `notifyAll()` method of this object.
final void	wait(long millis, int nanos) Causes the calling thread to wait until another thread calls the `notify()` or `notifyAll()` method of this object or until the specified timeout expires.
final void	wait(long millis) Causes the calling thread to wait until another thread calls the `notify()` or `notifyAll()` method of this object or until the specified timeout expires.

Public Constructors

public MulticastSocket ()

Since: API Level 1

Constructs a multicast socket, bound to any available port on the localhost.

Throws

IOException	if an error occurs creating or binding the socket.

public MulticastSocket (int aPort)

Since: API Level 1

Constructs a multicast socket, bound to the specified port on the localhost.

Parameters

aPort	the port to bind on the localhost.

Throws

IOException	if an error occurs creating or binding the socket.

public MulticastSocket (SocketAddress localAddr)

Since: API Level 1

Constructs a MulticastSocket bound to the host/port specified by the SocketAddress, or an unbound DatagramSocket if the SocketAddress is null.

Parameters

localAddr	the local machine address and port to bind to.

Throws

IllegalArgumentException	if the `SocketAddress` is not supported.
IOException	if an error occurs creating or binding the socket.

Public Methods

public InetAddress getInterface ()

Since: API Level 1

Gets the network address used by this socket. This is useful on multihomed machines.

Returns

the address of the network interface through which the datagram packets are sent or received.

Throws

SocketException	if an error occurs while getting the interface address.

public boolean getLoopbackMode ()

Since: API Level 1

Gets the state of the SocketOptions.IP_MULTICAST_LOOP.

Returns

true if the IP multicast loop is enabled, false otherwise.

Throws

SocketException	if the socket is closed or the option is invalid.

public NetworkInterface getNetworkInterface ()

Since: API Level 1

Gets the network interface used by this socket. This is useful on multihomed machines.

Returns

the network interface used by this socket or null if no interface is set.

Throws

SocketException	if an error occurs while getting the interface.

public byte getTTL ()

Since: API Level 1

This method is deprecated.
Replaced by getTimeToLive()

Gets the time-to-live (TTL) for multicast packets sent on this socket.

Returns

the default value for the time-to-life field.

Throws

IOException	if an error occurs reading the default value.

public int getTimeToLive ()

Since: API Level 1

Gets the time-to-live (TTL) for multicast packets sent on this socket.

Returns

the default value for the time-to-life field.

Throws

IOException	if an error occurs reading the default value.

public void joinGroup (SocketAddress groupAddress, NetworkInterface netInterface)

Since: API Level 1

Adds this socket to the specified multicast group. A socket must join a group before data may be received. A socket may be a member of multiple groups but may join any group only once.

Parameters

groupAddress	the multicast group to be joined.
netInterface	the network interface on which the datagram packets will be received.

Throws

IOException	if the specified address is not a multicast address.
SecurityException	if the caller is not authorized to join the group.
IllegalArgumentException	if no multicast group is specified.

public void joinGroup (InetAddress groupAddr)

Since: API Level 1

Adds this socket to the specified multicast group. A socket must join a group before data may be received. A socket may be a member of multiple groups but may join any group only once.

Parameters

groupAddr	the multicast group to be joined.

Throws

IOException	if an error occurs while joining a group.

public void leaveGroup (SocketAddress groupAddress, NetworkInterface netInterface)

Since: API Level 1

Removes this socket from the specified multicast group.

Parameters

groupAddress	the multicast group to be left.
netInterface	the network interface on which the addresses should be dropped.

Throws

IOException	if the specified group address is not a multicast address.
SecurityException	if the caller is not authorized to leave the group.
IllegalArgumentException	if `groupAddress` is `null`.

public void leaveGroup (InetAddress groupAddr)

Since: API Level 1

Removes this socket from the specified multicast group.

Parameters

groupAddr	the multicast group to be left.

Throws

NullPointerException	if `groupAddr` is `null`.
IOException	if the specified group address is not a multicast address.
SecurityException	if the caller is not authorized to leave the group.

public void send (DatagramPacket pack, byte ttl)

Since: API Level 1

This method is deprecated.
use setTimeToLive(int).

Send the packet on this socket. The packet must satisfy the security policy before it may be sent.

Parameters

pack	the `DatagramPacket` to send
ttl	the TTL setting for this transmission, overriding the socket default

Throws

IOException	if an error occurs while sending data or setting options.

public void setInterface (InetAddress addr)

Since: API Level 1

Sets the interface address used by this socket. This allows to send multicast packets on a different interface than the default interface of the local system. This is useful on multihomed machines.

Parameters

addr	the multicast interface network address to set.

Throws

SocketException	if an error occurs while setting the network interface address option.

public void setLoopbackMode (boolean disable)

Since: API Level 1

Sets the IP_MULTICAST_LOOP.

Parameters

disable	true to disable loopback

Throws

SocketException	if the socket is closed or the option is invalid.

public void setNetworkInterface (NetworkInterface netInterface)

Since: API Level 1

Sets the network interface used by this socket. This is useful for multihomed machines.

Parameters

netInterface	the multicast network interface to set.

Throws

SocketException	if an error occurs while setting the network interface option.

public void setTTL (byte ttl)

Since: API Level 1

This method is deprecated.
Replaced by setTimeToLive(int)

Sets the time-to-live (TTL) for multicast packets sent on this socket. Valid TTL values are between 0 and 255 inclusive.

Throws

IOException	if an error occurs while setting the TTL option value.

public void setTimeToLive (int ttl)

Since: API Level 1

Sets the time-to-live (TTL) for multicast packets sent on this socket. Valid TTL values are between 0 and 255 inclusive.

Throws

IOException	if an error occurs while setting the TTL option value.

Interfaces

Classes

Enums

Exceptions

MulticastSocket

Class Overview

See Also

Summary

Public Constructors

public MulticastSocket ()

Throws

public MulticastSocket (int aPort)

Parameters

Throws

public MulticastSocket (SocketAddress localAddr)

Parameters

Throws

Public Methods

public InetAddress getInterface ()

Returns

Throws

public boolean getLoopbackMode ()

Returns

Throws

public NetworkInterface getNetworkInterface ()

Returns

Throws

public byte getTTL ()

Returns

Throws

See Also

public int getTimeToLive ()

Returns

Throws

public void joinGroup (SocketAddress groupAddress, NetworkInterface netInterface)

Parameters

Throws

public void joinGroup (InetAddress groupAddr)

Parameters

Throws

public void leaveGroup (SocketAddress groupAddress, NetworkInterface netInterface)

Parameters

Throws

public void leaveGroup (InetAddress groupAddr)

Parameters

Throws

public void send (DatagramPacket pack, byte ttl)

Parameters

Throws

public void setInterface (InetAddress addr)

Parameters

Throws

public void setLoopbackMode (boolean disable)

Parameters

Throws

public void setNetworkInterface (NetworkInterface netInterface)

Parameters

Throws

public void setTTL (byte ttl)

Throws

See Also

public void setTimeToLive (int ttl)

Throws