MVC Post 和 Put 映射方法，响应正文值“null”但使用 Post Man 时状态 200 OK

Question

我正在尝试使用 Spring Boot MVC 来做一个应用程序，但遇到了问题。对于 Post 和 Put 方法，我收到状态 200 ok，但值为“null”。数据库上的新注册已创建，但仅填充 Id（自动增量）列并在 Postman 响应中接收。有人可以帮我吗？

` @RequestMapping("/api") @RestController 公共类 ExtractedNumbersController { 私有最终 ExtractedNumbersService extractedNumbersService; @Autowired 公共ExtractedNumbersController（ExtractedNumbersService ExtractedNumbersService）{ this.extractedNumbersService = extractedNumbersService; 邮差

    @PostMapping("/addExtractedNumbers")
    public ExtractedNumbers addExtractedNumbers(@RequestBody ExtractedNumbers extractedNumbers) {
        return extractedNumbersService.addExtractedNumbers(extractedNumbers);
    }


    @GetMapping("/findAllExtractedNumbers")
    public List<ExtractedNumbers> findAllActivities() {
        return extractedNumbersService.findAllExtractedNumbers();
    }

    @GetMapping("findExtractedNumbersById/{id}")
    public Optional<ExtractedNumbers> findExtractedNumbersById(@PathVariable("id") Integer id) {
        return extractedNumbersService.findByIdExtractedNumbers(id);
    }

    @PutMapping("/updateExtractedNumbers/{id}")
    public ExtractedNumbers updateProduct(@PathVariable("id") Integer id, @RequestBody ExtractedNumbers extractedNumbers) {
        Optional<ExtractedNumbers> extractedNumbersFromDatabase = extractedNumbersService.findByIdExtractedNumbers(id);
        if (extractedNumbersFromDatabase.isPresent()) {
            extractedNumbersFromDatabase.get().setExtractedNumbers(extractedNumbers.getExtractedNumbers());
            extractedNumbersFromDatabase.get().setExtractionDate(extractedNumbers.getExtractionDate());
            final ExtractedNumbers updatedExtractedNumbers = extractedNumbersService.addExtractedNumbers(extractedNumbersFromDatabase.get());

            return updatedExtractedNumbers;
        }
        return extractedNumbersService.addExtractedNumbers(extractedNumbers);
    }

    @DeleteMapping("/deleteExtractedNumbersById/{id}")
    public void deleteExtractedNumbersById(@PathVariable("id") Integer id) {
        extractedNumbersService.deleteExtractedNumbers(id);
    }

}



@Data
@Table
@Entity
@AllArgsConstructor
@NoArgsConstructor
public class ExtractedNumbers {


    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Integer extractedNumbersId;
    @Column
    private String extractedNumbers;
    @Column
    private String extractionDate;

    public ExtractedNumbers(String extractedNumbers, String extractionDate) {
        this.extractedNumbers = extractedNumbers;
        this.extractionDate = extractionDate;
    }

    public String getExtractedNumbers() {
        return extractedNumbers;
    }

    public void setExtractedNumbers(String extractedNumbers) {
        this.extractedNumbers = extractedNumbers;
    }

    public String getExtractionDate() {
        return extractionDate;
    }

    public void setExtractionDate(String extractionDate) {
        this.extractionDate = extractionDate;
    }
}


public interface ExtractedNumbersService {
    List<ExtractedNumbers> findAllExtractedNumbers();
    ExtractedNumbers addExtractedNumbers(ExtractedNumbers extractedNumbers);
    Optional<ExtractedNumbers> findByIdExtractedNumbers(Integer extractedNumbersId);
    ExtractedNumbers update(ExtractedNumbers extractedNumbers);
    void deleteExtractedNumbers(Integer extractedNumbersId);
}



@Service
public class ExtractedNumbersServiceImpl implements ExtractedNumbersService {
    private final ExtractedNumbersRepository extractedNumbersRepository;

    public ExtractedNumbersServiceImpl(ExtractedNumbersRepository extractedNumbersRepository) {
        this.extractedNumbersRepository = extractedNumbersRepository;
    }

    @Override
    public List<ExtractedNumbers> findAllExtractedNumbers() { return extractedNumbersRepository.findAll() ; }

    @Override
    public ExtractedNumbers addExtractedNumbers(ExtractedNumbers extractedNumbers) {
        return extractedNumbersRepository.save(extractedNumbers);
    }

    @Override
    public Optional<ExtractedNumbers> findByIdExtractedNumbers(Integer extractedNumbersId) {
        return extractedNumbersRepository.findById(extractedNumbersId);
    }

    @Override
    public ExtractedNumbers update(ExtractedNumbers extractedNumbers) {
        return extractedNumbersRepository.save(extractedNumbers);
    }

    @Override
    public void deleteExtractedNumbers(Integer extractedNumbersId) {
extractedNumbersRepository.deleteById(extractedNumbersId);
    }
}`

[Database][1]

提取的数字类

Answer 1

你的ExtractedNumbers中的属性和数据库表列一致吗？
如果您的表格列类似于extracted_numbers，您需要对camel添加下划线