注解@ConfigurationProperties使用

@ConfigurationProperties注解有个prefix属性，通过指定的前缀，绑定配置文件的相关配置。该注解可以放在类上，也可以放在方法上。
从官方的注释中了解，当作用于方法上时，如果绑定配置，需要有@Bean注解且对应的类需要@Configuration注解

@Target({ ElementType.TYPE, ElementType.METHOD })
@Retention(RetentionPolicy.RUNTIME)
@documented
@Indexed
public @interface ConfigurationProperties {}

一、放在类上使用
配置文件：

personinfo:
  name: jack02
  age: 12

Java POJO类

@Component
@ConfigurationProperties(prefix = "personinfo")
public class PersonInfo {

    private int age;
    private String name;

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }
}

测试：

@Autowired
    private PersonInfo personInfo;

    @Test
    public void getPersonInfo(){
        System.out.println(personInfo.getName()+"-"+personInfo.getAge());
    }

二、放在方法上
配置文件

student:
  name: jack03
  age: 24
  sex: M

Java POJO类

public class Student {
    private String name;
    private int age;
    private String sex;

    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 getSex() {
        return sex;
    }

    public void setSex(String sex) {
        this.sex = sex;
    }
}

Java Config 类

@Configuration
public class StudentConfig {

    @Bean
    @ConfigurationProperties(prefix = "student")
    public Student getStudent(){
        return new Student();
    }
}

测试

@Autowired
    private Student student;

    @Test
    public void getStudent(){
        System.out.println(student.getName()+"-"+student.getAge()+"-"+student.getSex());
    }