Receives a datagram packet from this socket. When this method returns, the DatagramPacket's buffer is filled with the data received. The datagram packet also contains the sender's IP address, and the port number on the sender's machine.

This method blocks until a datagram is received. The length field of the datagram packet object contains the length of the received message. If the message is longer than the packet's length, the message is truncated.

If there is a security manager, a packet cannot be received if the security manager's checkAccept method does not allow it.

Parameters:

p the DatagramPacket into which to place the incoming data.

Exceptions:

IOException     if an I/O error occurs.

SocketTimeoutException     if setSoTimeout was previously called and the timeout has expired.

PortUnreachableException     may be thrown if the socket is connected to a currently unreachable destination. Note, there is no guarantee that the exception will be thrown.

java.nio.channels.IllegalBlockingModeException     if this socket has an associated channel, and the channel is in non-blocking mode.

@revised 1.4
@spec JSR-51

`IOException`		if an I/O error occurs.
`SocketTimeoutException`		if setSoTimeout was previously called and the timeout has expired.
`PortUnreachableException`		may be thrown if the socket is connected to a currently unreachable destination. Note, there is no guarantee that the exception will be thrown.
`java.nio.channels.IllegalBlockingModeException`		if this socket has an associated channel, and the channel is in non-blocking mode.