springboot的yml文件，如果值是数组的话，不应该用[]吗？为什么如下用逗号分隔也会起效？

Question

Answer 1

原生 YAML 可能不支持，但是 Spring Boot 官方是做了支持的：

Table 4. relaxed binding rules per property source Property Source Simple List

Property Source	Simple	List
Properties Files	Camel case, kebab case, or underscore notation	Standard list syntax using [ ] or comma-separated values
YAML Files	Camel case, kebab case, or underscore notation	Standard YAML list syntax or comma-separated values
Environment Variables	Upper case format with underscore as the delimiter (see Binding from Environment Variables).	Numeric values surrounded by underscores (see Binding from Environment Variables)
System properties	Camel case, kebab case, or underscore notation	Standard list syntax using [ ] or comma-separated values