学习数据库连接池和spring jdbc可以简化jdbc原始代码数据库连接池的概念数据库连接池就是一个容器（集合），存放数据库连接对象的容器当系统初始化之后（Tomcat服务器启动），容器被创建，容器中会申请一些连接对象，当用户来访问数据库时，直接从容器中获取连接对象（无需再跟数据库创建连接），用户访问完之后，会将连接对象归还给容器好处节约资源用户访问高效实现标准接口：DataSource方法：....

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