SpringBoot中@ConfigurationProperties注解实现配置绑定的三种方法

human.name=Mr.Yu
human.age=21
human.gender=male

public class PropertiesUtil {
    public static void getProperties(Person person) throws ioException {
        Properties properties = new Properties();
        properties.load(new FileInputStream("src/main/resources/demo.properties"));
        //得到配置文件key的名字
        Enumeration enumeration = properties.propertyNames();
        while (enumeration.hasMoreElements()){
            String key =(String)enumeration.nextElement();
            String value = properties.getProperty(key);
            System.out.println("key="+key+"——————value="+value);
            //封装到JavaBean
            //以下内容省略
        }
    }
}

human.name=Mr.Yu
human.age=21
human.gender=male

@Component ////只有在容器中的组件，才会拥有SpringBoot提供的强大功能
@ConfigurationProperties(value = "human")
public class Person {
    public String name;
    public int age;
    public String gender;
    public Person() {
    }
    public Person(String name, int age, String gender) {
        this.name = name;
        this.age = age;
        this.gender = gender;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public int getAge() {
        return age;
    }
    public void setAge(int age) {
        this.age = age;
    }
    public String getGender() {
        return gender;
    }
    public void setGender(String gender) {
        this.gender = gender;
    }
    @Override
    public String toString() {
        return "Person{" +
                "name='" + name + '\'' +
                ", age=" + age +
                ", gender='" + gender + '\'' +
                '}';
    }
}

//@Controller
////@ResponseBody以字符串的方式写给浏览器，而不是跳转到某个页面
//@ResponseBody
//@RestController =  @Controller +  @ResponseBody
@RestController
public class HelloController {
    //自动注入属性
    @Autowired
    Person person;
    @RequestMapping("/person")
    public Person getPerson(){
        return person;
    }
}

server.port=8888
human.name=Mr.Yu
human.age=21
human.gender=male222