java 获取properties的几种方式

spring下获取Properties方式

比如已有的commonConfig.properties

main.db.driverClassName=com.mysql.jdbc.Driver
main.db.url=jdbc:mysql://cloudpkdbrw.xxx.com:3306/huagang?useUnicode=true&characterEncoding=UTF-8&zeroDateTimeBehavior=convertToNull
main.db.username=huagang
main.db.password=xxxHGtest