spring + Druid + jdbc 出现 errorCode 0, state 08000原因

将

driverClassName=com.mysql.cj.Driver
url=jdbc:mysql://localhost:3306/dp01?useSSL=false&serverTimezone=CST&characterEncoding=utf-8&rewriteBatchedStatements=true
username=root
password=123456

改为

jdbc.driverClassName=com.mysql.cj.Driver
jdbc.url=jdbc:mysql://localhost:3306/dp01?useSSL=false&serverTimezone=CST&characterEncoding=utf-8&rewriteBatchedStatements=true
jdbc.username=root
jdbc.password=123456

直接${username} 会读取不出来