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Class java.net.DatagramPacket 

java.lang.Object
   |
   +----java.net.DatagramPacket
public final class DatagramPacket
extends Object
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.

Constructor Index

o DatagramPacket(byte[], int)
Constructs a DatagramPacket for receiving packets of length ilength.
o DatagramPacket(byte[], int, InetAddress, int)
Constructs a datagram packet for sending packets of length ilength to the specified port number on the specified host.

Method Index

o getAddress()
Returns the IP address of the machine to which this datagram is being sent or from which the datagram was received.
o getData()
Returns the data received or the data to be sent.
o getLength()
Returns the length of the data to be sent or the length of the data received.
o getPort()
Returns the port number on the remote host to which this datagram is being sent or from which the datagram was received.
o setAddress(InetAddress)
o setData(byte[])
o setLength(int)
o setPort(int)

Constructors

o DatagramPacket 
 public DatagramPacket(byte ibuf[],
                       int ilength)
Constructs a DatagramPacket for receiving packets of length ilength.

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

Parameters:
ibuf - buffer for holding the incoming datagram.
ilength - the number of bytes to read.
o DatagramPacket 
 public DatagramPacket(byte ibuf[],
                       int ilength,
                       InetAddress iaddr,
                       int iport)
Constructs a datagram packet for sending packets of length ilength to the specified port number on the specified host. The length argument must be less than or equal to ibuf.length.

Parameters:
ibuf - the packet data.
ilength - the packet length.
iaddr - the destination address.
iport - the destination port number.
See Also:
InetAddress

Methods

o getAddress 
 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.
See Also:
InetAddress
o getPort 
 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.
o getData 
 public synchronized byte[] getData()
Returns the data received or the data to be sent.

Returns:
the data received or the data to be sent.
o getLength 
 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.
o setAddress 
 public synchronized void setAddress(InetAddress iaddr)
o setPort 
 public synchronized void setPort(int iport)
o setData 
 public synchronized void setData(byte ibuf[])
o setLength 
 public synchronized void setLength(int ilength)

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