修改 /etc/my.cnf

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[client] 
default-character-set = utf8mb4
[mysql] 
default-character-set = utf8mb4
[mysqld] 
character-set-client-handshake = FALSE 
character-set-server = utf8mb4 
collation-server = utf8mb4_unicode_ci 
init_connect='SET NAMES utf8mb4'

代码中

tomcat 6 + 、jetty 6 + 均在内部支持emoji，无须做任何代码上的修改即可