MVC Post和Put映射方法，使用Post Man响应主体值“null”，但状态200 OK

Question

我试图用Spring Boot MVC做一个html" target="_blank">应用程序，但遇到了一个问题。对于Post和Put方法，我收到状态200 ok，但值为“null”。创建了数据库上的新注册，但只填充了Id（自动增量）列，并在Postman响应中接收。谁能帮帮我吗？

`@RequestMapping（“/api”）@RestController公共类ExtractedNumbersController{private final ExtractedNumbersService ExtractedNumbersService；@Autowired public ExtractedNumbersController（ExtractedNumbersService ExtractedNumbersService）{this.ExtractedNumbersService=ExtractedNumbersService；}

    @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]

邮递员提取的数字类

Answer 1

你在ExtractedNumbers中的属性是否与数据库表列一致？如果你的表列像extracted_numbers你需要做下划线骆驼