Summary of Java Socket Programming Learning Blog

Java Socket programming is very good introductory blog

http://haohaoxuexi.iteye.com/blog/1979837

More detailed explanation about Socket and ServerSocket

http://www.cnblogs.com/rond/p/3565113.html

Socket Demo with multi-person chat function

http://www.pudn.com/downloads466/sourcecode/java/jsp/detail1955007.html

Heartbeat detection long connection

http://coach.iteye.com/blog/2024444