mysql/Java服务端对emoji的支持
emoji表情清单
http://www.oicqzone.com/tool/emoji/
参考页面
http://www.cnblogs.com/shihaiming/p/5855616.html
https://segmentfault.com/a/1190000000616820
https://segmentfault.com/a/1190000004594385
ALTER TABLE tablename CONVERT TO CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;