com.objectwave.networkUtility
Class UDPUtils

java.lang.Object
  |
  +--com.objectwave.networkUtility.UDPUtils

public class UDPUtils

extends java.lang.Object

UDP is commonly used for broadcast capabilities. By sending to the highest ip of a network address, all subnet members will receive the UDP packet. A network address is the IP address of a machines bit wised anded with the network mask. example: 206.20.164.18 is my machine's IP. 255.255.255.0 is my subnet mask. 206.20.164.0 is our network address. 206.20.164.255 is the standard broadcast address. However, it may be better to use a multicast socket instead.

Version:

$Id: UDPUtils.java,v 2.0 2001/06/11 15:54:25 dave_hoag Exp $

Author:

dhoag

Constructor Summary

UDPUtils()

Method Summary

void	close()
java.lang.Object	receiveObjectUDP(int portNumber) Retrieve an object on the specified port number.
static byte[]	receiveUDP(int numBytes, int portNumber) Receive a UDP packet from a local UDP port, as an array of bytes.
void	sendObjectUDP(java.lang.Object o, java.lang.String host, int portNumber)
static void	sendUDP(byte[] msg, java.lang.String host, int portNumber) Send a byte array as a UDP packet to some host & port.
static void	setVerbose(boolean state) Sets the Verbose attribute of the UDPUtils class

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

UDPUtils

public UDPUtils()

Method Detail

setVerbose

public static void setVerbose(boolean state)

Sets the Verbose attribute of the UDPUtils class

Parameters:

state - The new Verbose value

receiveUDP

public static byte[] receiveUDP(int numBytes,
                                int portNumber)
                         throws java.net.SocketException,
                                java.io.IOException

Receive a UDP packet from a local UDP port, as an array of bytes.

Parameters:

numBytes -

portNumber -

Returns:

Throws:

java.net.SocketException

java.io.IOException

sendUDP

public static void sendUDP(byte[] msg,
                           java.lang.String host,
                           int portNumber)
                    throws java.net.SocketException,
                           java.io.IOException,
                           java.net.UnknownHostException

Send a byte array as a UDP packet to some host & port.

Parameters:

msg -

host -

portNumber -

Throws:

java.net.SocketException

java.io.IOException

java.net.UnknownHostException

close

public void close()

receiveObjectUDP

public java.lang.Object receiveObjectUDP(int portNumber)

Retrieve an object on the specified port number.

Parameters:

portNumber -

Returns:

sendObjectUDP

public void sendObjectUDP(java.lang.Object o,
                          java.lang.String host,
                          int portNumber)

Parameters:

o -

host -

portNumber -