+--------------------------+----------------------------+

修改為utf8編碼：修改/etc/my.cnf
在[client]下增加default-character-set=utf8
在[mysqld]下增加character_set_server=utf8
重新查看編碼情況：
mysql> show variables like character%;
+--------------------------+----------------------------+
| Variable_name            | Value                      |
+--------------------------+----------------------------+
| character_set_client     | utf8                       |
| character_set_connection | utf8                       |
| character_set_database   | utf8                       |
| character_set_filesystem | binary                     |
| character_set_results    | utf8                       |
| character_set_server     | utf8                       |
| character_set_system     | utf8                       |
| character_sets_dir       | /usr/share/mysql/charsets/ |
+--------------------------+----------------------------+
如此修改后，JDBC訪問不會出現亂碼。
注意JSP頁面編碼也要寫成UTF-8.