public class getProperties {
     public static void main(String[] args) throws FileNotFoundException, IOException {
         Properties pps = new Properties();
         pps.load(new FileInputStream("a.properties"));
         Enumeration enum1 = pps.propertyNames();//得到配置文件的名字
         while(enum1.hasMoreElements()) {
             String strKey = (String) enum1.nextElement();
             String strValue = pps.getProperty(strKey);
             System.out.println(strKey + "=" + strValue);
             //封裝到JavaBean
             ... ...
         }
     }

@Component
public class Car {
    private String brand;
    private Integer price;
// get set tostring 就不貼了

mycar.brand=QQ
mycar.price=9999

@RestController
public class HelloController {
    @Autowired
    Car car;
    @RequestMapping("/car")
    public Car car() {
        return car;
    }
    @RequestMapping("/hello")
    public String Hello() {
        return "Hello SpringBoot2 你好";
    }
}

//@ConditionalOnBean(name = "pet1")
@Import({User.class, DBHelper.class})
@Configuration(proxyBeanMethods = true)
@ImportResource("classpath:beans.xml")  //配置文件的類路徑
@EnableConfigurationProperties(Car.class) //開啟屬性配置的功能
public class MyConfig {
 
    @Bean("user1")
    public User user01(){
        User pingguo = new User("pingguo",20);
        pingguo.setPet(tomcatPet());
        return pingguo;
    }
 
    @Bean("pet22")
    public Pet tomcatPet(){
        return new Pet("tomcat");
    }
}

//@Component
@ConfigurationProperties(prefix = "mycar")
public class Car {
    private String brand;
    private Integer price;