该字段的问题是其类型是另一个类

Question

我创建了一个转换为另一个类的字段，通过它我得到了json，问题发生在哪里，但我不明白我做错了什么

User班级

public class User extends BaseEntity<Integer> {

  private String firstName;

  private String lastName;

  @Column(name = "username")

  private String username;

  @Convert(converter = PurshasedProductConverter.class)

  private PurshasedProductConverter purshasedProducts;

}

PurshasedProductConverter班级

public class PurshasedProductConverter implements AttributeConverter<PurshasedProduct, String> {

  private static final Logger LOG = (Logger) LoggerFactory.getLogger(PurshasedProductConverter.class);

  private final ObjectMapper mapper = new ObjectMapper();

  @Override

  public String convertToDatabaseColumn(PurshasedProduct attribute) {

    try {

        if (attribute != null)

            return mapper.writeValueAsString(attribute);

        else

        return null;

    } catch (JsonProcessingException e) {

        LOG.error(e.getMessage(), e);

        throw new RuntimeException(e);

    }

  }

  @Override

  public PurshasedProduct convertToEntityAttribute(String dbData) {

    TypeReference<HashMap<String, String>> typeRef

            = new TypeReference<HashMap<String, String>>() {

    };

    try {

        PurshasedProduct purshasedProduct = new PurshasedProduct();

        if (dbData != null)

            purshasedProduct.strings = mapper.readValue(dbData, typeRef);

        return purshasedProduct;

    } catch (IOException e) {

        LOG.error(e.getMessage(), e);

        throw new RuntimeException(e);

    }

  }

}

PurshasedProduct班级

public class PurshasedProduct {

  public Map<String, String> strings = new HashMap<>();

  public static PurshasedProduct create(String key, String value) {

    PurshasedProduct purshasedProduct = new PurshasedProduct();

    purshasedProduct.set(key, value);

    return purshasedProduct;

  }

  public void set(String lang, String text) {

    if (text == null || lang == null) {

        return;

    }

    strings.put(lang, text);

  }

Answer 1

看一看：@Convert(converter = PurshasedProductConverter.class)private PurshasedProductConverter purshasedProducts;您也用于PurshasedProductConverter注释和字段类型。您应该将其更改为要从/转换为 in 的字段类型PurshasedProductConverter。@Convert(converter = PurshasedProductConverter.class)private PurshasedProduct purshasedProducts;