Constructor Summary

Method Summary

Constructor Details

• DatagramPacket

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

  Constructs aDatagramPacket for receiving packets of lengthlength, specifying an offset into the buffer.

  Thelength argument must be less than or equal tobuf.length.

  Parameters:

  buf - buffer for holding the incoming datagram.

  offset - the offset for the buffer

  length - the number of bytes to read.

  Throws:

  IllegalArgumentException - if the length or offset is negative, or if the length plus the offset is greater than the length of the packet's given buffer.

  Since:

  1.2

• DatagramPacket

  public DatagramPacket(byte[] buf, int length)

  Constructs aDatagramPacket for receiving packets of lengthlength.

  Thelength argument must be less than or equal tobuf.length.

  Parameters:

  buf - buffer for holding the incoming datagram.

  length - the number of bytes to read.

  Throws:

  IllegalArgumentException - if the length is negative or if the length is greater than the length of the packet's given buffer.

• DatagramPacket

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

  Constructs a datagram packet for sending packets of lengthlength with offsetoffset to the specified port number on the specified host. Thelength argument must be less than or equal tobuf.length.

  Parameters:

  buf - the packet data.

  offset - the packet data offset.

  length - the packet data length.

  address - the destination address, ornull.

  port - the destination port number.

  Throws:

  IllegalArgumentException - if the length or offset is negative, or if the length plus the offset is greater than the length of the packet's given buffer, or if the port is out of range.

  Since:

  1.2

  See Also:

  • InetAddress

• DatagramPacket

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

  Constructs a datagram packet for sending packets of lengthlength with offsetoffset to the specified port number on the specified host. Thelength argument must be less than or equal tobuf.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 is null or its type is not supported, or if the length or offset is negative, or if the length plus the offset is greater than the length of the packet's given buffer.

  Since:

  1.4

  See Also:

  • InetAddress

• DatagramPacket

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

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

  Parameters:

  buf - the packet data.

  length - the packet length.

  address - the destination address, ornull.

  port - the destination port number.

  Throws:

  IllegalArgumentException - if the length is negative, or if the length is greater than the length of the packet's given buffer, or if the port is out of range.

  See Also:

  • InetAddress

• DatagramPacket

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

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

  Parameters:

  buf - the packet data.

  length - the packet length.

  address - the destination address.

  Throws:

  IllegalArgumentException - if address is null or its type is not supported, or if the length is negative, or if the length is greater than the length of the packet's given buffer, or if the port is out of range.

  Since:

  1.4

  See Also:

  • InetAddress

Method Details

• getAddress

  public InetAddress getAddress()

  Returns the IP address of the machine to which this datagram is being sent or from which the datagram was received, ornull if not set.

  Returns:

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

  See Also:

  • InetAddress
  • setAddress(java.net.InetAddress)

• getPort

  public int getPort()

  Returns the port number on the remote host to which this datagram is being sent or from which the datagram was received, or 0 if not set.

  Returns:

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

  See Also:

  • setPort(int)

• getData

  public byte[] getData()

  Returns the data buffer. The data received or the data to be sent starts from theoffset in the buffer, and runs forlength long.

  Returns:

  the buffer used to receive or send data

  See Also:

  • setData(byte[], int, int)

• getOffset

  public 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.

  Since:

  1.2

• getLength

  public 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.

  See Also:

  • setLength(int)

• setData

  public 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:

  IllegalArgumentException - if the length or offset is negative, or if the length plus the offset is greater than the length of the packet's given buffer.

  Since:

  1.2

  See Also:

  • getData()
  • getOffset()
  • getLength()

• setAddress

  public void setAddress(InetAddress iaddr)

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

  Parameters:

  iaddr - theInetAddress, ornull.

  Since:

  1.1

  See Also:

  • getAddress()

• setPort

  public void setPort(int iport)

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

  Parameters:

  iport - the port number

  Throws:

  IllegalArgumentException - if the port is out of range

  Since:

  1.1

  See Also:

  • getPort()

• setSocketAddress

  public 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 - theSocketAddress

  Throws:

  IllegalArgumentException - if address is null or is a SocketAddress subclass not supported.

  Since:

  1.4

  See Also:

  • getSocketAddress()

• getSocketAddress

  public SocketAddress getSocketAddress()

  Returns theSocketAddress (usuallyIP address +port number) of the remote host that this packet is being sent to or is coming from.

  Returns:

  theSocketAddress

  Since:

  1.4

  See Also:

  • setSocketAddress(java.net.SocketAddress)

• setData

  public 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 ofbuf.

  Parameters:

  buf - the buffer to set for this packet.

  Since:

  1.1

  See Also:

  • getLength()
  • getData()

• setLength

  public 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. Thelength plus theoffset must be lesser or equal to the length of the packet's data buffer.

  Parameters:

  length - the length to set for this packet.

  Throws:

  IllegalArgumentException - if the length is negative, or if the length plus the offset is greater than the length of the packet's data buffer.

  Since:

  1.1

  See Also:

  • getLength()
  • setData(byte[], int, int)