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ServerSocket and UDP

chantm
chantm asked
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Last Modified: 2008-03-10
Hi,
   Can someone help me with the following problems:
   When I set up a ServerSocket and use a Socket with its stream flag set to true, everything is working fine but once I set the flag to false(ie UDP) there doesn't seem to be a connection... UDP can't be that unrealiabe since I am sending from one window(for serevr) to another(the socket). Where could I have gone wrong?
  Also if I use,eg
   OutputStream outstream = myserver.getOutputStream();
  how much data can I send thru outstream.write(mydata) before mydata is actually send out. Is there a way for me to set the system buffer?
   Is there a Java equivalent to C's union?

   Thanks.


    tm
CHAN
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1) You should be using the DatagramPacket and DatagramSocket classes. Not the Socket class with stram set to false. (this does not invoke UDP, it just stipulates that you do not want a permanent connection beteen th client and the host).

See:

http://www.inf.uni-hohenheim.de/top/java/tutorial/networking/datagrams/definition.html

and

http://www.inf.uni-hohenheim.de/top/java/tutorial/networking/datagrams/clientServer.html

for theory and sample code on how to work with UDP.

2) No way to set the system buffer, but you can set up a counter and call the streams flush() method whenever you want it to.

3) No actual equivalent, since jJava's class (as is C++'s) is related to the struct construct.

Their is a way to do it (though weathr its acceptable for your app or not is debatable).

You can derive a class from java.util.Dictionary

The dictobnary class which maps keys to values. Any object can be used as a key and/or value.  

You could therfore implement either a bag class or add an index to your union (by efectivley converting it into a struct with a union member) and work arrounf the problem.

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