Consider-defining-a-bean-of-type-java-lang-String-in-your-configuration

@SuppressWarnings("all")

@RestController

@RequestMapping("/books")

public class BookController {

   @Value("${lesson}")

   private String lesson;

   @Value("${enterprise.name}")

   private String name;

   @Value("${enterprise.age}")

   private String age;

   @Value("${enterprise.tel}")

   private String tels;

   @Value("${enterprise.subject[0]}")

   private String subject_0;

   @Autowired

   private Environment environment;

   @Autowired

   private Enterprise enterprise;

   @GetMapping("/{id}")

   public String getById(@PathVariable Integer id){

      System.out.println("id ==> "+id);

      System.out.println(lesson);

      System.out.println(name);

      System.out.println(age);

      System.out.println(tels);

      System.out.println(subject_0);

      System.out.println(environment.getProperty("enterprise.name"));

      System.out.println("---------------------------------------");

      System.out.println(enterprise);

      return "bookcontroller getbyid running...";

   }

}

@SuppressWarnings("all")

@Component

@ConfigurationProperties(prefix = "enterprise")

public class Enterprise {

    private String name;

    private Integer age;

    private String tel;

    private String[] subject;

    public String getName() {

        return name;

    }

    public Enterprise(String name, Integer age, String tel, String[] subject) {

        this.name = name;

        this.age = age;

        this.tel = tel;

        this.subject = subject;

    }

    public void setName(String name) {

        this.name = name;

    }

    public Integer getAge() {

        return age;

    }

    public void setAge(Integer age) {

        this.age = age;

    }

    public String getTel() {

        return tel;

    }

    public void setTel(String tel) {

        this.tel = tel;

    }

    public String[] getSubject() {

        return subject;

    }

    public void setSubject(String[] subject) {

        this.subject = subject;

    }

    @Override

    public String toString() {

        return "Enterprise{" +

                "name='" + name + '\'' +

                ", age=" + age +

                ", tel='" + tel + '\'' +

                ", subject=" + Arrays.toString(subject) +

                '}';

    }

}