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<>基本类型的使用
yml文件大部分使用的都是字符串，如果想使用其它类型，只要直接按其它类型写变量值就可以了。
举例：
#使用boolean my-switch: is-on: true
Java中使用只要加上@Value就可以了：
@Value("${my-switch.is-on}") private boolean switchOn;
使用其它类型也是一样的。
<>集合的使用
举例：
#使用int的list student: ids: [1, 2, 3, 4, 5]
或者：
#使用int的list student: ids: - 1 - 2 - 3 - 4 - 5
这个时候要注意了，Java如果直接写成：
@Value("${student.id}") private List<Integer> ids;
启动时会报错，Cannot resolve placeholder 什么的
这时候应该新建一个对list属性的配置类：
@Configuration @ConfigurationProperties("student") public class PropertyConfig{
private List<Integer> ids; // getter & setter }
然后在要使用的地方自动注入，调用一个getter方法就可以得到配置文件中的值。
yml文件还可以存放对象和对象的集合，使用方法与基本类型类似。
简单举例：
#使用对象 student: id: 1 name: Bruce gender: male #使用对象集合 students: - id: 1 name:
Brucegender: male - id: 2 name: ... ...
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