This code is reference from Mrs sun, a good female author.
notice: 1 nio including Buffer Channel Selector and optional Charset. actually there are two Buffers, one for accept ing message and one for sending.
2 return \r\n for line end
3 attendtion to buffer issue
4 attendtion to select key issue
I change little bit: 1 add handshaking process 2 add heartbeat process
package socket.nio;import java.net.*;import java.nio.channels.*;import java.nio.*;import java.io.*;import java.nio.charset.*;im