28 lines
759 B
Markdown
28 lines
759 B
Markdown
# Spring PlaceholderResolver
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- 类全路径: `org.springframework.util.PropertyPlaceholderHelper.PlaceholderResolver`
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- 类作用将占位符中的内容替换成属性值.
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- 假设现有属性表: user.dir = c:\home
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传入参数 user.dir 会获得 c:\home
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```java
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@FunctionalInterface
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public interface PlaceholderResolver {
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/**
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* Resolve the supplied placeholder name to the replacement value.
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* @param placeholderName the name of the placeholder to resolve
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* @return the replacement value, or {@code null} if no replacement is to be made
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*/
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@Nullable
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String resolvePlaceholder(String placeholderName);
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}
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```
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- 类图如下
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