Kettle连接MySQL报错：Driver class 'org.gjt.mm.mysql.Driver' could not be found, make sure the 'MySQL' driver (jar file) is installed-526互联

在Windows系统里面安装kettle后打算连接MySQL的时候突然报错

错误连接数据库 [wanghui] : org.pentaho.di.core.exception.KettleDatabaseException: 
Error occurred while trying to connect to the database

Driver class 'org.gjt.mm.mysql.Driver' could not be found, make sure the 'MySQL' driver (jar file) is installed.
org.gjt.mm.mysql.Driver

问题是：没有找到Mysql的驱动，下载驱动文件（注：下载5.1.48这个版本的驱动zip文件，8.0.18版本已经没那个驱动了，需要下载之前的版本）

MySQL :: Download MySQL Connector/J (Archived Versions)

然后可以去src文件夹里面查看，能看到最后的Driver这个文件就说明下的驱动是完整的：