①：添加JSR303规范坐标与Hibernate校验框架对应坐标

<dependency><groupId>javax.validation</groupId><artifactId>validation-api</artifactId>
</dependency><dependency><groupId>org.hibernate.validator</groupId><artifactId>hibernate-validator</artifactId>
</dependency>

②：对Bean开启校验功能 

@Component
@Data
@ConfigurationProperties(prefix = "servers")
@Validated
public class ServerConfig {
}

③：设置校验规则 

@Component
@Data
@ConfigurationProperties(prefix = "servers")
@Validated
public class ServerConfig {@Max(value = 400,message = "最大值不能超过400")private int port;
}

小结：   1.  启用Bean属性校验 导入JSR303与Hibernate校验框架坐标

              2.使用@Validated注解启用校验功能

              3.使用具体校验规则规范数据校验格式