Attribute injection in spring boot, application.properties custom prefixes and using properties to encapsulate MySQL

In the previous project, we continued to create a new method. The name is SHOWJDBC:

This approach is primarily to return links to some databases.

Here is how to get the property values in the Application.properties configuration file, the configuration file is as follows:

Method One: To get the value in the configuration file, you have to inject the property value first, such as:

However, this method injects too many attribute values, to write each, very troublesome, and not good-looking.
And, if there are a few places to use the database connection, then every place to write a string, redundancy of large

So let's switch to another method:

Create a new class Mysqlproperties:

After the reboot, the normal access is still available:

Attribute injection in spring boot, application.properties custom prefixes and using properties to encapsulate MySQL