## 类的使用
org.springframework.beans.factory.config.PropertyResourceConfigurer

- 使用PropertyResourceConfigurer的程序包
  程序包 | 说明
  --- | ---
  org.springframework.beans.factory.config | SPI interfaces and configuration-related convenience classes for bean factories.

- - ### org.springframework.beans.factory.config中PropertyResourceConfigurer的使用

    org.springframework.beans.factory.config中PropertyResourceConfigurer的子类
    限定符和类型 | 类和说明
    --- | ---
    `class` | `PlaceholderConfigurerSupport` Abstract base class for property resource configurers that resolve placeholders in bean definition property values.
    `class` | `PreferencesPlaceholderConfigurer` Subclass of PropertyPlaceholderConfigurer that supports JDK 1.4's Preferences API (`java.util.prefs`).
    `class` | `PropertyOverrideConfigurer` Property resource configurer that overrides bean property values in an application context definition.
    `class` | `PropertyPlaceholderConfigurer` `PlaceholderConfigurerSupport` subclass that resolves ${...} placeholders against `local` `properties` and/or system properties and environment variables.