mysql存储emoji表情要使用utf8mb4字符集，这是4字节存储，最低支持版本为5.5.3+，若不是，请升级到较新版本。
修改mysql配置文件
Window目录： mysql/my.ini Ubuntu16.04目录： /etc/mysql/conf.d/mysql.cnf 配置Client /etc/mysql/mysql.conf.d/mysql.cnf 配置Server 其他目录： 一般在etc/mysql/my.cnf在mysql配置文件添加以下三部分内容：
[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'修改完后重启mysql，检查字符集
# mysql -uroot -p # mysql > SHOW VARIABLES WHERE Variable_name LIKE 'character_set_%' OR Variable_name LIKE 'collation%';结果
+--------------------------+--------------------+ | Variable_name | Value | +--------------------------+--------------------+ | character_set_client | utf8mb4 | | character_set_connection | utf8mb4 | | character_set_database | utf8mb4 | | character_set_filesystem | binary | | character_set_results | utf8mb4 | | character_set_server | utf8mb4 | | character_set_system | utf8 | | collation_connection | utf8mb4_unicode_ci | | collation_database | utf8mb4_unicode_ci | | collation_server | utf8mb4_unicode_ci | +--------------------------+--------------------+ rows in set (0.00 sec)Java链接配置
jdbc.driverClass=com.mysql.jdbc.Driver jdbc.jdbcUrl=jdbc:mysql://localhost:3306/tgb?useUnicode=true&characterEncoding=utf8&autoReconnect=true&rewriteBatchedStatements=TRUE jdbc.user=root jdbc.password= jdbc.initialPoolSize=10 jdbc.minPoolSize=10 jdbc.maxPoolSize=50 jdbc.maxIdleTime=3600 jdbc.testConnectionOnCheckout=false jdbc.testConnectionOnCheckin=true jdbc.idleConnectionTestPeriod=3600