druid连接java.sql.SQLNonTransientConnectionException: Could not create connection to database server.

java.sql.SQLNonTransientConnectionException: Could not create connection to database server. Attempted reconnect 3 times. Giving up.

There is a problem with the configuration file url in durid.properties. It should be in the following form:

url=jdbc:mysql://127.0.0.1:3306/db?useUnicode=true&characterEncoding=utf-8&useSSL=false&serverTimezone =Asia/Shangha