1.倒入mysql驱动 , c3p0连接池 ,mybatis依赖 //mysql驱动依赖 mysql mysql-connector-java 5.1.40 //c3p0依赖 com.mchange c3p0 0.9.5.2 //mybatis依赖 org.mybatis mybatis 3.5.2 //log4j依赖 log4j log4j 1.2.17 MyBatis的xml映射文件:mybatis-config.xml c3p0连接连接数据库