## 接口的使用
org.springframework.util.PropertyPlaceholderHelper.PlaceholderResolver

- 使用PropertyPlaceholderHelper.PlaceholderResolver的程序包
  程序包 | 说明
  --- | ---
  org.springframework.util | Miscellaneous utility classes, such as String manipulation utilities, a Log4J configurer, and a state holder for paged lists of objects.

- - ### org.springframework.util中PropertyPlaceholderHelper.PlaceholderResolver的使用

    参数类型为PropertyPlaceholderHelper.PlaceholderResolver的org.springframework.util中的方法
    限定符和类型 | 方法和说明
    --- | ---
    `protected String` | PropertyPlaceholderHelper.`parseStringValue(String value, PropertyPlaceholderHelper.PlaceholderResolver placeholderResolver, Set<String> visitedPlaceholders)`
    `String` | PropertyPlaceholderHelper.`replacePlaceholders(String value, PropertyPlaceholderHelper.PlaceholderResolver placeholderResolver)` Replaces all placeholders of format `${name}` with the value returned from the supplied `PropertyPlaceholderHelper.PlaceholderResolver`.