Java 配置C3P0数据连接池存入数据存入数据库出现中文乱码问题

数据库版本：MySQL5.5.56

源代码如下：

<!-- default-config 默认的配置， --><default-config><property name="driverClass">com.mysql.jdbc.Driver</property><property name="jdbcUrl">jdbc:mysql://localhost/vvcat?serverTimezone=GMT%2B8</property><property name="user">root</property><property name="password">123456</property><property name="initialPoolSize">10</property><property name="maxIdleTime">30</property><property name="maxPoolSize">100</property><property name="minPoolSize">10</property><property name="maxStatements">200</property></default-config>

应该改为

serverTimezone=GMT%2B8&：为设置时区useUnicode=true&characterEncoding=utf-8：设置数据连接传输格式为utf-8

?serverTimezone=GMT%2B8&useUnicode=true&characterEncoding=utf-8

<!-- default-config 默认的配置， --><default-config><property name="driverClass">com.mysql.jdbc.Driver</property><property name="jdbcUrl">jdbc:mysql://localhost/vvcat?serverTimezone=GMT%2B8&amp;useUnicode=true&amp;characterEncoding=utf-8</property><property name="user">root</property><property name="password">123456</property><property name="initialPoolSize">10</property><property name="maxIdleTime">30</property><property name="maxPoolSize">100</property><property name="minPoolSize">10</property><property name="maxStatements">200</property></default-config>

数据库设置为utf-8格式

数据库表格式设置为utf-8格式