A simple way to inject values defined in configuration files into Java variables in the Java Spring framework

Suppose I define some configuration in application.properties under classpath:

I want this configuration to be automatically injected into a variable in my Java code. The easiest way to do this is to use annotations @propertysource and annotation@Value. The following example is easy to understand:

@value (“${spring.redis. Host}”) automatically injects the Value of the configuration item in application.properties into the Java variable redisHost of type String.

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