前言：手机app应用评论的时候，恢复表情符号，提示失败。 ? 1，查看tomcat后台日志，核心报错信息如下： Caused by: java.sql.SQLException: Incorrect string value: ‘\xF0\x9F\x98\x97\xF0\x9F...‘ for column ‘CONTENT‘ at row 1 at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1074) at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4096) at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4028) at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2490) at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2651) at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2734) at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:2155) at com.mysql.jdbc.PreparedStatement.execute(PreparedStatement.java:1379) at org.apache.commons.dbcp.DelegatingPreparedStatement.execute(DelegatingPreparedStatement.java:172) at org.apache.commons.dbcp.DelegatingPreparedStatement.execute(DelegatingPreparedStatement.java:172) at com.ibatis.sqlmap.engine.execution.SqlExecutor.executeUpdate(SqlExecutor.java:80) at com.ibatis.sqlmap.engine.mapping.statement.MappedStatement.sqlExecuteUpdate(MappedStatement.java:216) at com.ibatis.sqlmap.engine.mapping.statement.MappedStatement.executeUpdate(MappedStatement.java:94) ... 46 more [root@mysqlvm2 ~]# mysql -root -p mysql> use test; Database changed mysql> show tables; Ignoring query to other database mysql> Ctrl-C -- exit! Aborted 忘记输入-u参数了，冲洗你输入，OK，如下所示： [root@mysqlvm2 ~]# mysql -uroot -p Enter password: Welcome to the MySQL monitor. Commands end with ; or \g. Your MySQL connection id is 4 Server version: 5.6.12-log Source distribution Copyright (c) 2000, 2011, Oracle and/or its affiliates. All rights reserved. Oracle is a registered trademark of Oracle Corporation and/or its affiliates. Other names may be trademarks of their respective owners. Type ‘help;‘ or ‘\h‘ for help. Type ‘\c‘ to clear the current input statement. mysql> mysql> use test; Database changed mysql> show tables; +------------------------+ | Tables_in_test | +------------------------+ | c | | lubin_test | | test | | tt | +------------------------+ 10 rows in set (0.00 sec) 这种输入Incorrect string value: ‘\xF0\x9F\x98\x97\xF0\x9F...‘的问题，多数都是字符集的，以前从latain改成gbk，从gbk改成utf8，而我的CONTENT字段已经utf8了，那么比utf8更多的就只有utf8mb4了，所以去修改表字段的字符集吧。
mysql>
2，先去修改表字段字符集为utf8mb4： ALTER TABLE UGC_REVIEW_CONTENT MODIFY `CONTENT` TEXT CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci COMMENT ‘评论内容‘; 执行完后，再在手机端的app测试，依然报同样的错误。
3，再去修改表字符集utf8mb4： ALTER TABLE UGC_REVIEW_CONTENT CHARSET=utf8mb4 COMMENT=‘晒单/推荐的评论内容‘; 执行完后，再在手机端的app测试，依然报同样的错误。
4，再去修改数据库的字符集utf8mb4: vim my.cnf init-connect=‘SET NAMES utf8mb4‘ character-set-server=utf8mb4
重启mysql数据库 [root@mysqlvm4 ~]# service mysql restart Shutting down MySQL.... [确定] Starting MySQL.............................................[确定].. [root@mysqlvm4 ~]#
