springboot2.2.6.RELEASE chapter15 配置文件注入class使用前缀

my.servers[0]=dev.example.com
my.servers[1]=another.example.com

@ConfigurationProperties(prefix="my")
public class Config {
    private List<String> servers = new ArrayList<String>();
    public List<String> getServers() {
        return this.servers;
    }
}