Correct the remote database access method! (Not said by the young master !)

When you use JDBC to access a remote database, the URL is properly written!
For example, String ConnStr = "jdbc: mysql: // IP: PORT/db ";
String MyUser = "name ";
String MyPassword = "password ";
The most important thing is to open the remote access permission for this user name in the database! (This is what the young master did not say! After connecting me for a long time, I thought it was a problem with my ConnStr! A lot of detours have been taken! Haha ~~~~~~~~~~~~~)