这种说法是错误的 static ConfigurationUnit configurationUnit = new ConfigurationUnit(); 不应创建对象
spring只将属性注入到由应用程序上下文处理的bean中，spring创建带有注解的类bean @ Configuration 配置单元

@Configuration
@ConfigurationProperties("example-unit")
public class ConfigurationUnit {

public List<String> confiList;

public List<String> getConfiList() {
    return this.confiList;
    }

 }

spring boot main中的demoapplication从applicationcontext获取bean，并从中获取list对象

@SpringBootApplication
public class DemoApplication {

public static void main(String[] args) {

    ApplicationContext context = SpringApplication.run(DemoApplication.class, args);
     ConfigurationUnit unit = context.getBean("configurationUnit"):

    System.out.print(unit. getConfiList());
   }

}

将列表置于prefix.property下。对你来说 example-unit.confi-list: . 通常为您的财产提供一个设置器： setConfiList(List<String> strings) . 但由于您已经将它初始化为空数组列表，所以这个setter已经过时了。还有一个建议是向应用程序类添加启用注解：
应用 班级应该有 @启用配置属性 注解

下面是关于springbboot配置绑定工作原理的参考资料。
特别针对您的问题，这是一个实现您目标的应用程序示例：
应用程序.yml

example-unit:
  confiList:
    - string1
    - string2
    - hello22

来源

@SpringBootApplication
@EnableConfigurationProperties(ConfigurationUnit.class)
public class DemoApplication {

    public static void main(String[] args) {
        ConfigurableApplicationContext context = SpringApplication.run(DemoApplication.class, args);
        ConfigurationUnit configurationUnit = context.getBean(ConfigurationUnit.class);
        System.out.println(configurationUnit.getConfiList());
    }

}

@ConfigurationProperties("example-unit")
public class ConfigurationUnit {

    public List<String> confiList = new ArrayList<>();

    public List<String> getConfiList() {
        return this.confiList;
    }

}

举个例子：
应用程序.yml：

example-unit: string1,string2,hello22

配置单元类：

@Component
@PropertySource(value="classpath:application.yml")
public class ConfigurationUnit {

    @Value("#{'${example-unit}'.split(',')}")
    private List<String> confiList;

    public List<String> getConfiList() {
        return confiList;
    }
}

demofileloadapplication.class:类：

@SpringBootApplication
public class DemoFileLoadApplication {

    public static void main(String[] args) {
        ConfigurableApplicationContext context = SpringApplication.run(DemoFileLoadApplication.class, args);
        ConfigurationUnit configurationUnit = context.getBean(ConfigurationUnit.class);
        System.out.println(configurationUnit.getConfiList());
    }
}

输出：
[string1，string2，你好22]