https://stackoverflow.com/questions/20366418/any-difference-between-ctx-write-and-ctx-channel-write-in-netty
https://blog.csdn.net/linuu/article/details/51315373
https://www.jianshu.com/p/90414d45f40e
https://stackoverflow.com/questions/34189756/warning-about-ssl-connection-when-connecting-to-mysql-database
http://www.cnblogs.com/vamei/archive/2013/04/01/2992484.html
https://blog.csdn.net/xiao__gui/article/details/8188833
https://blog.csdn.net/hejingyuan6/article/details/47053409
http://www.importnew.com/20861.html
https://blog.csdn.net/liuchunming033/article/details/47423913
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