## 简述
作用 yml中配置自定义属性
[官网文档](https://docs.spring.io/spring-boot/docs/3.0.6/reference/html/configuration-metadata.html#appendix.configuration-metadata.manual-hints.value-providers.spring-profile-name)
1. 配置实体类
```text
@Component
@ConfigurationProperties(prefix = "application")
#也可以在属性上通过@Value 设置默认值
```
2. 配置yaml
```text
#编写具体参数带有提示
application:
name: Demo
version: 0.0.1
website: www.monody.net
```
3. 运行
```text
运行之后若想在/target/classes/META-INF 下生成 spring-configuration-metadata.json
需要导入
org.springframework.boot
spring-boot-configuration-processor
true
```
## spring-configuration-metadata.json格式
```text
其中的项目分类在“组”或“属性”下，默认值提示分类在“提示”下
```
具体常用属性可查看 [官网文档](https://docs.spring.io/spring-boot/docs/3.0.6/reference/html/configuration-metadata.html#appendix.configuration-metadata.manual-hints.value-providers.spring-profile-name)
## 注意事项
可以嵌套
```text
@ConfigurationProperties(prefix = "my.server")
public class MyServerProperties {
private String name;
private Host host;
public static class Host {
private String ip;
private int port;
}
#ymal
my:
server:
name: test
host:
ip: localhost
port: 8899
```
### 绑定properties文件
```text
@PropertySource(value = {"classpath:metadata/applicationInfo.properties"})
@Component
@ConfigurationProperties(prefix = "application")
```
```text
#applicationInfo.properties
application.name=Demo
application.version=0.0.1
application.website=www.monody.net
```
```text
#在配置文件引用其他变量
${application.name}
#在不存在时配置默认
${application.name:monody}
```
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