Spring PlaceholderResolver

• 类全路径: org.springframework.util.PropertyPlaceholderHelper.PlaceholderResolver

• 类作用将占位符中的内容替换成属性值.

  • 假设现有属性表: user.dir = c:\home 传入参数 user.dir 会获得 c:\home

    @FunctionalInterface
    public interface PlaceholderResolver {
        /**
         * Resolve the supplied placeholder name to the replacement value.
         * @param placeholderName the name of the placeholder to resolve
         * @return the replacement value, or {@code null} if no replacement is to be made
         */
        @Nullable
        String resolvePlaceholder(String placeholderName);
    }

• 类图如下