SERVERS step1: Create a Channel Handler.
1. Extend the SimpleChannelHandler
2. Override its method messageRecieved.
3. exceptionCaught to close the connection while IO issues.
Step2: Write a another method to run the handler.
1. Create a channel factory.
2. setPipeline factory.
3. Bootstarp method helps to set up the channel.
Step3: Print the message received
1. print the message which we have recieved.
2. by creating a channelbuffer object.( is a fundamental data structure which stores a sequence of bytes in Netty.)
3. read the buffer.