连接池源代码请参看前一篇博文

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连接池管理类中的属性：

private?int?clients;?//??

????private?Vector?drivers?=?new?Vector();???

????private?PrintWriter?log;???

???? private?Hashtable?pools?=?new?Hashtable();???

内部类DBConnectionPool的属性：

private?int?checkedOut;?//?当前连接数??

????private?Vector?freeConnections?=?new?Vector();?//?保存所有可用连接??