About Spring using the Context:property-placeholder property placeholder settings configuration file

About Spring using the Context:property-placeholder property placeholder settings configuration file

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The configuration file is stored as a key value, and the key is referenced in the spring configuration with ${}, and the value is configured in the configuration file. The life cycle of a specific key variable may be the current context, the requirement certificate.

http://docs.spring.io/spring/docs/current/spring-framework-reference/htmlsingle/#beans-factory-placeholderconfigurer

Simplified form, if a property is not found in the attribute you specify, it is checked in the system properties. You can also customize this behavior by setting the following three values of the Systempropertiesmode property.

About Spring using the Context:property-placeholder property placeholder settings configuration file