Datagram sockets HELP NEEDED!

[jambeard lewistrix]

Firstly if anyone knows any texts / sites which have a lot of info on datagrams could you please tell me!

Ok, I have an assignment which requires me to make a server that can handle multiple clients (and make the clients) using datagram sockets / packets.

One of the things it asks me to do is; when a client connects to the server, the server needs to record the clients name and IP address.

I have NO idea how to do this, I can send packets with datagrams and simple things like that but have no idea how to do this.

Could someone PLEASE help!!

If you want to take a look at the code I have so far go to

https://coderanch.com/t/377591/java/java/Network-assignment-HELP-NEEDED

Thanks

James

[Karen Baog]

As you can receive packets you simply call the .getAddress() to get the IP address, and .getPort() to get the port.

For example,

  
int packetSize = 1024;
byte[] data = new byte[packetSize ];
DatagramPacket packet = new DatagramPacket(data, packetSize );
 
//assuming you have received data at this point
 
//to get the address
InetAddress address = packet.getAddress();
 
//to get the port
int clientPort = packet.getPort();
 

Karen
[ August 16, 2005: Message edited by: Karen Baog ]

[jambeard lewistrix]

Is there any other info you can give me on datagrams?

I'm supposed to make a client and server program for travel agents. The client is supposed to be able to log on and off from the server (all using datagrams) but from what i uderstand you can't really do that with datagrams because they're a bit random.

I can send / recieve packets but REALLY don't understand how to do anything else with them. Also, after i've recieved a packet, how do I turn the data from a stream of bytes back into a string?