项目上线后，经常需要更新配置。springboot下配置默认加载后无法做到运行时更新。不过springcloud里提供了刷新
支持。
##相关依赖Spring actuator，Spring cloud starter
```
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter</artifactId>
</dependency>
```
##dependencyManagement 自动装配configer refresh actuator
```
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-dependencies</artifactId>
<version>${spring-cloud.version}</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
```
## 暴露配置刷新端点
```
management.endpoints.web.exposure.include=refresh
```
## 配置中追加RefreshScope 注解
```
@Component
@ConfigurationProperties(prefix = "sys")
@RefreshScope
public class Config {
...
}
```
## 刷新接口 post 请求
```
http://localhost:8080/actuator/refresh
```
```