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As simple example have a look at http://java.sun.com/docs/books/tutorial/networking/datagrams/examples/QuoteServerThread.java

Here is an extract of the code.



public void run() {

...

Have a look at Writing a Datagram Client and Server (The Java™ Tutorials > Custom Networking > All About Datagrams)

// Json

Why not use TCP instead then?

Have a look at Apache MINA - Index for some nice tools for networking :)

// Json