Database connection error Communications link failure when Springboot starts

When running the springboot project, a database error broke out

Go to search first, what is the maximum connection time, modify the my.ini file, and the url

same error message

But after looking at it, I found that the error type is different

When this kind of error occurs, you need to check the port number (the port number of some other people's projects is not 3306)

jdbc:mysql://localhost:3306

Solve the problem after modifying it to the local port number 3306