jdbc链接字符串中各个参数的意思

jdbc:mysql:replication://${DRUID.HOST:host}:${DRUID.PORT:3306}/${DRUID.DATABASE:dbtest}?allowMultiQueries=true&useSSL=true&useUnicode=true&characterEncoding=utf8&autoReconnect=true&failOverReadOnly=true&serverTimezone=GMT%2B8