所有Java异常信息汇总

异常信息：com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure

The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.

翻译：com.mysql.jdbc.exceptions.jdbc4.CommunicationsException：通信链路失败

成功发送到服务器的最后一个数据包是0毫秒前。 驱动程序未收到来自服务器的任何数据包。

 

解决：

　　MySQL 连接字符串 URL 地址错误！