ModelMapper 无法将 java.lang.String 转换为 java.lang.Long

Question

我有剩余模型，用于构建发送的 JSON。

休息模型

@Getter @Setter
@ToString
public class OrderRequestModel {
    private String orderKeyId;
    private String paymentMode;
    private double totalAmount;
    private List<ProductRequestModel> orderProducts;
    private UserDetailsRequestModel seller;
    private Date createdAt;
}

ProductRequestModel 类似

@Getter @Setter
@ToString
public class ProductRequestModel {
    private String productKeyId;
    private String name;
    private double price;
    private int qty;
    private String imgPath;

    private CategoryRequestModel category;
}

我将模型传递到与数据库相关的 DTO 层（它们包含一个长 ID）：

@Getter @Setter
@ToString
public class OrderDto implements Serializable {
    @Getter(AccessLevel.NONE)
    @Setter(AccessLevel.NONE)
    private static final long serialVersionUID = 1L;

    private Long id;
    private String orderKeyId;
    private String paymentMode;
    private double totalAmount;
    private List<ProductDto> orderProducts;
    private UserDto seller;
    private Date createdAt;
}

我的 ProductDto ：

@Getter @Setter
@ToString
public class ProductDto implements Serializable {
    // ommit this member and do not generate getter / setter
    @Getter(AccessLevel.NONE)
    @Setter(AccessLevel.NONE)
    private static final long serialVersionUID = 1L;

    private Long id;
    private String productKeyId;
    private String name;
    private double price;
    private int qty;
    private String imgPath;

    private CategoryDto category = new CategoryDto();
}

当我尝试将 OrderDto 与关联模型映射时，我会隐式执行此操作：

OrderDto orderDto = modelMapper.map(orderRequestModel, OrderDto.class);

理论上，模型中的 orderKeyId 应与其 Dto 中的等效项匹配。不幸的是它返回一个错误：

Converter org.modelmapper.internal.converter.NumberConverter@3e36f4cc failed to convert java.lang.String to java.lang.Long.
Caused by: org.modelmapper.MappingException: ModelMapper mapping errors:

我确实需要 DTO 中的 Id，因为如果我想进行更新，我会使用“id”

Answer 1

此问题是由于映射策略引起的。我们可以将映射策略设置为 STRICT，这样当从源对象属性映射到目标对象的属性时，它仅映射那些属性名称及其数据类型完全匹配的属性。下面是一个例子。

public ModelMapper modelMapper() {
    ModelMapper modelMapper = new ModelMapper();
    modelMapper.getConfiguration()
        .setMatchingStrategy(MatchingStrategies.STRICT);
}

仅供参考： http://modelmapper.org/user-manual/configuration/#matching-strategies