为同一个POJO类的不同输出创建自定义注释

Question

@JsonInclude(JsonInclude.Include.NON_EMPTY)
@JsonAutoDetect(fieldVisibility = ANY, getterVisibility = NONE, setterVisibility = NONE)
public class Product implements Serializable, UniqueKeyAware {

    private static final long serialVersionUID = -7311148654827944888L;

    @JsonIgnore
    private String uniqueKey;

    @JsonProperty("uniqueKey")
    private String uniqueKeyV2;

    @JsonProperty("gtin")
    private String gtin;

    @JsonProperty("printedGtin")
    private String printedGtin;

    @JsonProperty("tpnb")
    private String tpnb;

    @JsonProperty("tpnc")
    private String tpnc;

    @JsonProperty("tpna")
    private String tpna;

    @JsonProperty("itemNumber")
    private String itemNumber;

    @JsonProperty("catId")
    private String catId;

    @JsonProperty("styleCode")
    private String styleCode;

    @JsonProperty("description")
    private String description;

    @JsonProperty("brand")
    private String brand;

    @JsonProperty("isOwnLabel")
    private Boolean isOwnLabel;

    @JsonProperty("regulatedProductName")
    private String regulatedProductName;

    @JsonProperty("country")
    private List<Country> region;

    ... // remove for simplicity

null

最终产品应该如下所示：

@JsonInclude(JsonInclude.Include.NON_EMPTY)
@JsonAutoDetect(fieldVisibility = ANY, getterVisibility = NONE, setterVisibility = NONE)
public class Product implements Serializable, UniqueKeyAware {

    private static final long serialVersionUID = -7311148654827944888L;

    @JsonIgnore
    private String uniqueKey;

    @JsonProperty("uniqueKey") @public @private
    private String uniqueKeyV2;

    @JsonProperty("gtin") @public
    private String gtin;

    @JsonProperty("printedGtin") @public
    private String printedGtin;

    @JsonProperty("tpnb")@private
    private String tpnb;

    @JsonProperty("tpnc")@private
    private String tpnc;

    @JsonProperty("tpna")@priviledge
    private String tpna;

    ... // removed for simplicity

在上面的例子中，@public instance将只有uniqueKey、gtin、printedGtin作为属性。

Answer 1

我找到解决办法了。我们需要的是Jackson中已经存在的@JsonView注释。我们首先需要像这样创建视图类：

public class Views
{
    public static class Public{};
    public static class Partner extends Public{};
    public static class Priviledge extends Partner {};
    public static class Private extends Priviledge {};
}

那么，我们的主要产品类别将是这样的。

@JsonInclude(JsonInclude.Include.NON_EMPTY)
@JsonAutoDetect(fieldVisibility = ANY, getterVisibility = NONE, setterVisibility = NONE)
public class MyProduct implements Serializable, UniqueKeyAware {

    private static final long serialVersionUID = -7311148654827944888L;

    @JsonIgnore
    private String uniqueKey;

    @JsonProperty("uniqueKey")
    @JsonView(Views.Partner.class)
    private String uniqueKeyV2;

    @JsonProperty("gtin")
    @JsonView(Views.Public.class)
    private String gtin;

    @JsonProperty("printedGtin")
    @JsonView(Views.Public.class)
    private String printedGtin;

    @JsonProperty("tpnb")
    @JsonView(Views.Public.class)
    private String tpnb;

    // skipped other attributes and getter setter

主函数将如下所示：

ObjectMapper mapper = new ObjectMapper();
MyProduct product = mapper.readerWithView(Views.Public.class).forType(MyProduct.class).readValue(json)