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

public final class

DatagramPacket

extends Object

java.lang.Object
↳	java.net.DatagramPacket

Class Overview

This class represents a datagram packet.

Datagram packets are used to implement a connectionless packet delivery service. Each message is routed from one machine to another based solely on information contained within that packet. Multiple packets sent from one machine to another might be routed differently, and might arrive in any order. Packet delivery is not guaranteed.

Summary

Public Constructors
	DatagramPacket(byte[] buf, int offset, int length) Constructs a `DatagramPacket` for receiving packets of length `length`, specifying an offset into the buffer.
	DatagramPacket(byte[] buf, int length) Constructs a `DatagramPacket` for receiving packets of length `length`.
	DatagramPacket(byte[] buf, int offset, int length, InetAddress address, int port) Constructs a datagram packet for sending packets of length `length` with offset `ioffset`to the specified port number on the specified host.
	DatagramPacket(byte[] buf, int offset, int length, SocketAddress address) Constructs a datagram packet for sending packets of length `length` with offset `ioffset`to the specified port number on the specified host.
	DatagramPacket(byte[] buf, int length, InetAddress address, int port) Constructs a datagram packet for sending packets of length `length` to the specified port number on the specified host.
	DatagramPacket(byte[] buf, int length, SocketAddress address) Constructs a datagram packet for sending packets of length `length` to the specified port number on the specified host.

Public Methods
synchronized InetAddress	getAddress() Returns the IP address of the machine to which this datagram is being sent or from which the datagram was received.
synchronized byte[]	getData() Returns the data buffer.
synchronized int	getLength() Returns the length of the data to be sent or the length of the data received.
synchronized int	getOffset() Returns the offset of the data to be sent or the offset of the data received.
synchronized int	getPort() Returns the port number on the remote host to which this datagram is being sent or from which the datagram was received.
synchronized SocketAddress	getSocketAddress() Gets the SocketAddress (usually IP address + port number) of the remote host that this packet is being sent to or is coming from.
synchronized void	setAddress(InetAddress iaddr) Sets the IP address of the machine to which this datagram is being sent.
synchronized void	setData(byte[] buf) Set the data buffer for this packet.
synchronized void	setData(byte[] buf, int offset, int length) Set the data buffer for this packet.
synchronized void	setLength(int length) Set the length for this packet.
synchronized void	setPort(int iport) Sets the port number on the remote host to which this datagram is being sent.
synchronized void	setSocketAddress(SocketAddress address) Sets the SocketAddress (usually IP address + port number) of the remote host to which this datagram is being sent.

[Expand]

Inherited Methods

From class java.lang.Object

Object	clone() Creates and returns a copy of this object.
boolean	equals(Object obj) Indicates whether some other object is "equal to" this one.
void	finalize() Called by the garbage collector on an object when garbage collection determines that there are no more references to the object.
final Class<?>	getClass() Returns the runtime class of this `Object`.
int	hashCode() Returns a hash code value for the object.
final void	notify() Wakes up a single thread that is waiting on this object's monitor.
final void	notifyAll() Wakes up all threads that are waiting on this object's monitor.
String	toString() Returns a string representation of the object.
final void	wait() Causes the current thread to wait until another thread invokes the `notify()` method or the `notifyAll()` method for this object.
final void	wait(long timeout, int nanos) Causes the current thread to wait until another thread invokes the `notify()` method or the `notifyAll()` method for this object, or some other thread interrupts the current thread, or a certain amount of real time has elapsed.
final void	wait(long timeout) Causes the current thread to wait until either another thread invokes the `notify()` method or the `notifyAll()` method for this object, or a specified amount of time has elapsed.

Public Constructors

public DatagramPacket (byte[] buf, int offset, int length)

Constructs a DatagramPacket for receiving packets of length length, specifying an offset into the buffer.

The length argument must be less than or equal to buf.length.

Parameters

buf	buffer for holding the incoming datagram.
offset	the offset for the buffer
length	the number of bytes to read.

public DatagramPacket (byte[] buf, int length)

Constructs a DatagramPacket for receiving packets of length length.

The length argument must be less than or equal to buf.length.

Parameters

buf	buffer for holding the incoming datagram.
length	the number of bytes to read.

public DatagramPacket (byte[] buf, int offset, int length, InetAddress address, int port)

Constructs a datagram packet for sending packets of length length with offset ioffsetto the specified port number on the specified host. The length argument must be less than or equal to buf.length.

Parameters

buf	the packet data.
offset	the packet data offset.
length	the packet data length.
address	the destination address.
port	the destination port number.

public DatagramPacket (byte[] buf, int offset, int length, SocketAddress address)

Constructs a datagram packet for sending packets of length length with offset ioffsetto the specified port number on the specified host. The length argument must be less than or equal to buf.length.

Parameters

buf	the packet data.
offset	the packet data offset.
length	the packet data length.
address	the destination socket address.

Throws

IllegalArgumentException	if address type is not supported
SocketException

public DatagramPacket (byte[] buf, int length, InetAddress address, int port)

Constructs a datagram packet for sending packets of length length to the specified port number on the specified host. The length argument must be less than or equal to buf.length.

Parameters

buf	the packet data.
length	the packet length.
address	the destination address.
port	the destination port number.

public DatagramPacket (byte[] buf, int length, SocketAddress address)

Constructs a datagram packet for sending packets of length length to the specified port number on the specified host. The length argument must be less than or equal to buf.length.

Parameters

buf	the packet data.
length	the packet length.
address	the destination address.

Throws

IllegalArgumentException	if address type is not supported
SocketException

Public Methods

public synchronized InetAddress getAddress ()

Returns the IP address of the machine to which this datagram is being sent or from which the datagram was received.

Returns

the IP address of the machine to which this datagram is being sent or from which the datagram was received.

public synchronized byte[] getData ()

Returns the data buffer. The data received or the data to be sent starts from the offset in the buffer, and runs for length long.

Returns

the buffer used to receive or send data

public synchronized int getLength ()

Returns the length of the data to be sent or the length of the data received.

Returns

the length of the data to be sent or the length of the data received.

public synchronized int getOffset ()

Returns the offset of the data to be sent or the offset of the data received.

Returns

the offset of the data to be sent or the offset of the data received.

public synchronized int getPort ()

Returns the port number on the remote host to which this datagram is being sent or from which the datagram was received.

Returns

the port number on the remote host to which this datagram is being sent or from which the datagram was received.

public synchronized SocketAddress getSocketAddress ()

Gets the SocketAddress (usually IP address + port number) of the remote host that this packet is being sent to or is coming from.

Returns

the SocketAddress

public synchronized void setAddress (InetAddress iaddr)

Sets the IP address of the machine to which this datagram is being sent.

Parameters

iaddr	the `InetAddress`

public synchronized void setData (byte[] buf)

Set the data buffer for this packet. With the offset of this DatagramPacket set to 0, and the length set to the length of buf.

Parameters

buf	the buffer to set for this packet.

Throws

NullPointerException	if the argument is null.

public synchronized void setData (byte[] buf, int offset, int length)

Set the data buffer for this packet. This sets the data, length and offset of the packet.

Parameters

buf	the buffer to set for this packet
offset	the offset into the data
length	the length of the data and/or the length of the buffer used to receive data

Throws

NullPointerException	if the argument is null

public synchronized void setLength (int length)

Set the length for this packet. The length of the packet is the number of bytes from the packet's data buffer that will be sent, or the number of bytes of the packet's data buffer that will be used for receiving data. The length must be lesser or equal to the offset plus the length of the packet's buffer.

Parameters

length	the length to set for this packet.

Throws

IllegalArgumentException	if the length is negative of if the length is greater than the packet's data buffer length.

public synchronized void setPort (int iport)

Sets the port number on the remote host to which this datagram is being sent.

Parameters

iport	the port number

public synchronized void setSocketAddress (SocketAddress address)

Sets the SocketAddress (usually IP address + port number) of the remote host to which this datagram is being sent.

Parameters

address	the `SocketAddress`

Throws

IllegalArgumentException	if address is null or is a SocketAddress subclass not supported by this socket

Interfaces

Classes

Enums

Exceptions

DatagramPacket

Class Overview

Summary

Public Constructors

public DatagramPacket (byte[] buf, int offset, int length)

Parameters

public DatagramPacket (byte[] buf, int length)

Parameters

public DatagramPacket (byte[] buf, int offset, int length, InetAddress address, int port)

Parameters

See Also

public DatagramPacket (byte[] buf, int offset, int length, SocketAddress address)

Parameters

Throws

See Also

public DatagramPacket (byte[] buf, int length, InetAddress address, int port)

Parameters

See Also

public DatagramPacket (byte[] buf, int length, SocketAddress address)

Parameters

Throws

See Also

Public Methods

public synchronized InetAddress getAddress ()

Returns

See Also

public synchronized byte[] getData ()

Returns

See Also

public synchronized int getLength ()

Returns

See Also

public synchronized int getOffset ()

Returns

public synchronized int getPort ()

Returns

See Also

public synchronized SocketAddress getSocketAddress ()

Returns

See Also

public synchronized void setAddress (InetAddress iaddr)

Parameters

See Also

public synchronized void setData (byte[] buf)

Parameters

Throws

See Also

public synchronized void setData (byte[] buf, int offset, int length)

Parameters

Throws

See Also

public synchronized void setLength (int length)

Parameters

Throws

See Also

public synchronized void setPort (int iport)

Parameters

See Also

public synchronized void setSocketAddress (SocketAddress address)

Parameters

Throws

See Also