java - 在调用外部 API 的 Spring Boot 实体中填充 JPA

Question

是否可以在 Spring Boot 中调用外部 api 用 JPA 实体填充数据库？如果我有一个名为 Quote 的实体:

package guru.springframework.domain;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import java.math.BigDecimal;

@Entity
public class Quote {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long _id;
    private String description;

    public Long getId() {
        return _id;
    }

    public void setId(Long id) {
        this._id = id;
    }

    public String getDescription() {
        return description;
    }
    public void setDescription(String description) {
        this.description = description;
    }

}

如何调用这个API https://quotesondesign.com/api-v4-0/在 Spring Boot 中填充我的数据库？

Answer 1

首先，我不知道您代码的全局结构，但让我假设:

配置类:

@Configuration
public class appConfig{
  @Bean
  RestTemplate restTemplate(){
    return new RestTemplate();
  }

  @Bean
  ObjectMapper objectMapper(){
    return new ObjectMapper();
  }
}

服务等级:

import guru.springframework.domain.Qoate;
// Other imports

@Service
public class service{

@Autowired
private RestTemplate restTemplate;


@Autowired
private ObjectMapper objectMapper;

@Autowired
private QuoteRepository quoteRepository;

public void populateQoats {
// You can chose one of these tow cases

// Case 1
ResponseEntity<List<Qoate>> response = restTemplate.exchange(
  "http://rest to get the list of Qoates",
  HttpMethod.GET,
  null,
  new ParameterizedTypeReference<List<Qoate>>(){});
List<Qoate> result = response.getBody();

// Case 1
String response = restTemplate.getForObject(
  "http://rest to get the list of Qoates",
  String.class);

  List<Qoate> result = objectMapper.readValue(response, new TypeReference<List<Qoate>>(){});

  // Save the list into a database
  if(Objects.nonNull(result)) result.stream().filter(Objects::nonNull).foreach(element -> quoteRepository.saveAndFlush(element));

}

}

存储库:

public interface QuoteRepository  extends JpaRepository<Quote,Long>{

}

信息:

从 5.0 开始，非阻塞、响应式(Reactive) org.springframework.web.reactive.client.WebClient 提供了 RestTemplate 的现代替代方案，可有效支持同步和异步以及流场景。 RestTemplate 将在未来版本中弃用，并且今后不会添加主要新功能。

For more details

您可能需要添加到您的 appConfig.class 或 mainClass:

@EntityScan("paackage of your entity class")
@ComponentScan({"package of you service class","package of you controller class if you have it"})
@EnableJpaRepositories("package of your repository clas")

最后，我希望这能解决您的需求