![](https://img.haomeiwen.com/i11098565/b16f256d36736411.png)
类上有这三个标签:
@Component
@ConfigurationProperties(prefix = "file")
和
@Value("${file.hostname}")
有这个jar包
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-configuration-processor</artifactId>
<optional>true</optional>
</dependency>
类的加载得这样
![](https://img.haomeiwen.com/i11098565/c117acd04f7cd57b.png)
不能new
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