@Data
@Component
@ConfigurationProperties(prefix = "student")//告诉springboot将本类中的所有属性和配置文件的相关配置进行绑定
public class Student {       //prefix:配置文件中哪一个名称下面的属性进行一一映射
    private String sname;
    private int age;
    private Map<String,Object> maps;
    private List<Object> list;
    private Course course;
}

@Data
public class Course {
    private String courseno;
    private String coursename;
}

student:
  sname: zhai
  age: 12

  maps: {k1: 12,k2: 13}
  list:
    - zhai
    - zhang
  course:
    courseno: 202007
    coursename: javaweb

#配置student
student.age=12
student.sname=zhai
student.maps.k1=1
student.maps.k2=2
student.list=a,b,c
student.course.courseno=202007
student.course.coursename=java

//可以在测试期间很方便地类似编码一样进行自动注入等容器的功能
@SpringBootTestclass Springboot03ApplicationTests {
    @Autowired
    Student student;
    @Test
    void contextLoads() {
        System.out.println(student);
    }
}

   <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-configuration-processor</artifactId>
            <version>2.2.1.RELEASE</version>
   </dependency>

#配置student
student.sname=zhai
student.age=12
student.maps.k1=1
student.maps.k2=2
student.list=a,b,c
student.course.courseno=202007
student.course.coursename=java

@Data
@Component
public class Student {
    @Value("${student.sname}")
    private String sname;
    @Value("#{2*9}")
    private int age;
    private Map<String,Object> maps;
    private List<Object> list;
    private Course course;
}

@Data
@Component
@Validated
public class Student {
    @NonNull
    private String sname;
    private int age;
    private Map<String,Object> maps;
    private List<Object> list;
    private Course course;
}

@RestController
public class HelloController {
    @Value("${student.sname}")
    private String sname;
    @RequestMapping("/hello")
    public String hello(){
        return "hello"+sname;
    }
}

#配置student
student.sname=zhai
student.age=12
student.maps.k1=1
student.maps.k2=2
student.list=a,b,c
student.course.courseno=202007
student.course.coursename=java

#配置student
student.sname=zhai
student.age=12
student.maps.k1=1
student.maps.k2=2
student.list=a,b,c
student.course.courseno=202007
student.course.coursename=java

@Data
@Component
@PropertySource(value = {"classpath:student.properties"})
public class Student {
    private String sname;
    private int age;
    private Map<String,Object> maps;
    private List<Object> list;
    private Course course;
}

@SpringBootApplication(scanBasePackages = "com")
@ImportResource(locations = {"classpath:beans.xml"})
public class Springboot02Application {
    public static void main(String[] args) {
        SpringApplication.run(Springboot02Application.class, args);
    }
}

@Configuration
public class MyAppConfig {
    @Bean
    public HelloService helloService(){
        return new HellService();
    }
}