user:
  name: Manaphy
  age: 19
  sex: male

@RestController
public class ConfigPropertiesController {
    @Value("${user.name}")
    private String name;
    @Value("${user.age}")
    private Integer age;
    @Value("${user.sex}")
    private String sex;
    @GetMapping("/user")
    public String getUser() {
        return "{name:" + name + ",age:" + age + ",sex:" + sex + "}";
    }
}

/**
 * 將配置文件中配置的每一個屬性的值，映射到這個組件中
 * @ConfigurationProperties：告訴SpringBoot將本類中的所有屬性和配置文件中相關的配置進行綁定;
 * prefix = "person"：配置文件中哪個下面的所有屬性進行一一映射
 * 只有這個組件是容器中的組件，才能容器提供的@ConfigurationProperties功能
 */
@Component
@ConfigurationProperties(prefix = "person")
@Data
public class Person {
    private String lastName;
    private Integer age;
    private Boolean boss;
    private Date birth;
    private Map<String, Object> maps;
    private List<Object> lists;
    private Dog dog;
}
@Data
class Dog {
    private String name;
    private Integer age;
}

@RestController
public class PersonController {
    @Autowired
    private Person person;
    @GetMapping("/person")
    public Person getPerson() {
        return person;
    }
}

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-configuration-processor</artifactId>
    <optional>true</optional>
</dependency>

person.lastName=chen
person.age=22
person.boss=false
person.birth=2017/12/12
person.map1.k1=v1
person.map1.k2=v2
person.map2[k1]=v1
person.map2[k2]=v2
person.list[0]=zhang
person.list[1]=wang
person.list2=zhao,qian,sun,li
person.dog.name=小狗
person.dog.age=12

@Component
@ConfigurationProperties(prefix = "person")
//如果只有一個主配置類文件，@PropertySource可以不寫
@PropertySource("classpath:person.properties")
@Data
public class Person {
    private String lastName;
    private Integer age;
    private Boolean boss;
    private Date birth;
    private Map<String, Object> map1;
    private Map<String, Object> map2;
    private List<Object> list;
    private List<Object> list2;
    private Dog dog;
}
@Data
class Dog {
    private String name;
    private Integer age;
}

@Configuration
@Slf4j
public class BeanConfiguration {
    @Bean
    public YamlConfigurerUtil ymlConfigurerUtil() {
        //1:加載配置文件
        Resource app = new ClassPathResource("application.yml");
        Resource appDev = new ClassPathResource("application-dev.yml");
        Resource appProd = new ClassPathResource("application-prod.yml");
        YamlPropertiesFactoryBean yamlPropertiesFactoryBean = new YamlPropertiesFactoryBean();
        // 2:將加載的配置文件交給 YamlPropertiesFactoryBean
        yamlPropertiesFactoryBean.setResources(app);
        // 3：將yml轉換成 key：val
        Properties properties = yamlPropertiesFactoryBean.getObject();
        String active = null;
        if (properties != null) {
            active = properties.getProperty("spring.profiles.active");
        }
        if (StringUtils.isEmpty(active)) {
            log.error("未找到spring.profiles.active配置！");
        } else {
            //判斷當前配置是什么環(huán)境
            if ("dev".equals(active)) {
                yamlPropertiesFactoryBean.setResources(app, appDev);
            } else if ("prod".equals(active)) {
                yamlPropertiesFactoryBean.setResources(app, appProd);
            }
        }
        // 4: 將Properties 通過構造方法交給我們寫的工具類
        return new YamlConfigurerUtil(yamlPropertiesFactoryBean.getObject());
    }
}

public class YamlConfigurerUtil {
? ? private static Properties ymlProperties = new Properties();
? ? public YamlConfigurerUtil(Properties properties) {
? ? ? ? ymlProperties = properties;
? ? }
? ? public static String getStrYmlVal(String key) {
? ? ? ? return ymlProperties.getProperty(key);
? ? }
? ? public static Integer getIntegerYmlVal(String key) {
? ? ? ? return Integer.valueOf(ymlProperties.getProperty(key));
? ? }
}

@RestController
public class PersonController {
? ? @GetMapping("/msg")
? ? public String getMessage() {
? ? ? ? return YamlConfigurerUtil.getStrYmlVal("person.lastName");
? ? }
}