博主报的是：

org.springframework.jdbc.CannotGetJdbcConnectionException: Failed to obtain JDBC Connection; nested exception is java.sql.SQLNonTransientConnectionException: Could not create connection to database server. Attempted reconnect 3 times. Giving up.

解决：连接不上mysql，一般就是mysql或连接信息有问题，排除mysql，那就是连接信息 有问题了，修改 db.url.0 ,怎么改？

application.properties  : 

参与上面给的：

比如博主：

spring.datasource.platform=mysql
db.num=1
db.url.0=jdbc:mysql://127.0.0.1:3306/nacos_config?characterEncoding=utf8&connectTimeout=1000&socketTimeout=3000&autoReconnect=true&useUnicode=true&useSSL=false&serverTimezone=UTC
db.user=root
db.password=3333

 成功！