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json marshalling spring boot

Innocent Iguana answered on March 8, 2024 Popularity 9/10 Helpfulness 4/10

answer json marshalling spring boot

json marshalling spring boot

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// ---------------------Example 1 ----------------------
// Model class
@Entity
public class MyModel {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;
    private String name;
    private int age;

    public MyModel() {}

    public MyModel(String name, int age) {
        this.name = name;
        this.age = age;
    }
    // Getters and setters
}

// Repository to pull data using model
import org.springframework.data.jpa.repository.JpaRepository;
public interface MyModelRepository extends JpaRepository<MyModel, Long> {
}


// Custom CommandLineRunner
@Component
public class MyCommandLineRunner implements CommandLineRunner {

    @Autowired
    private ObjectMapper objectMapper; // Autowire ObjectMapper to handle JSON marshalling

    @Autowired
    private MyModelRepository myModelRepository;

    @Override
    public void run(String... args) throws Exception {
        MyModel model = new MyModel("John", 30); // Create a sample object
        myModelRepository.save(model); // Save the model in the database
        // Retrieve the model from the database and print its details
        MyModel retrievedModel = myModelRepository.findById(model.getId()).orElse(null);
        if (retrievedModel != null) {
            System.out.println("Retrieved model from database:");
            String json = objectMapper.writeValueAsString(retrievedModel); // Convert the object to JSON
	        System.out.println(json);
        }
    }
}
// ---------------------Example 2 ----------------------
@SpringBootApplication
public class MyApplication {
    public static void main(String[] args) {
        SpringApplication.run(MyApplication.class, args);
    }
  
    @Bean
    public CommandLineRunner dataFetcher() {
        return new DataFetcher();
    }

    private static class DataFetcher implements CommandLineRunner {
        @Override
        public void run(String... args) throws Exception {
            String apiUrl = "https://jsonplaceholder.typicode.com/posts/1";
            RestTemplate restTemplate = new RestTemplate();
            String response = restTemplate.getForObject(apiUrl, String.class);
            System.out.println(response);
        }
    }
}

Popularity 9/10 Helpfulness 4/10 Language java

Source: Grepper

Tags: javascript json marshalling spring-boot

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Contributed on Mar 08 2024

Innocent Iguana

0 Answers Avg Quality 2/10

json marshalling spring boot

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