在mybatis-config.xml配置
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
<settings>
<!-- 打印sql日志 -->
<setting name="logImpl" value="STDOUT_LOGGING" />
</settings>
</configuration>