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spring中，以 Aware结尾的类，都是干什么用的？能举例说明么？ #1

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lycying opened this issue Dec 4, 2020 · 4 comments
Open

spring中，以 Aware结尾的类，都是干什么用的？能举例说明么？ #1

lycying opened this issue Dec 4, 2020 · 4 comments

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@lycying
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lycying commented Dec 4, 2020

日期：2020-12-04
问题：spring中，以 Aware结尾的类，都是干什么用的？能举例说明么？
标签：Spring，初级
@lycying
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lycying commented Dec 4, 2020

Aware就是感知的意思，一般以该单词结尾的类，都实现了Aware接口，该接口就是一个标记，用于表示其子类是可以被回调的。具体回调方法由子类实现，比如ApplicationContextAware

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lycying commented Dec 4, 2020

实现了Aware结尾的接口类可以获得相应的spring框架里的相关实例，实际工作中我常用的是ApplicationContextAware获取到spring的上下文，再由此获得相关的bean，这也是获取注入bean的一种方法，在某些无法autowired的情况下使用

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lycying commented Dec 4, 2020

这个其实非常常用。可惜的是Spring没有默认提供这种Holder，结果每个项目里都要做这么一个工具类。非常的的不理解

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lycying commented Dec 10, 2020

http://xjjdog.cn/interview/16071378538533.html

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