java – 与Jackson重复的JSON字段

我正在使用Jackson与Spring一起进行JSON(de)序列化.但是,在某些情况下,我遇到了两次字段的问题.

我有一个抽象类：

@JsonTypeInfo(use = JsonTypeInfo.Id.NAME, include = JsonTypeInfo.As.PROPERTY, property = "mimeType")@JsonSubTypes({    @JsonSubTypes.Type(value = ImageBookmarkJsonModel.class, name = "image/jpeg"),    @JsonSubTypes.Type(value = EpubBookmarkJsonModel.class, name = "application/epub zip")})public abstract class AbstractBookmarkJsonModel extends AbstractJsonModel {    protected String mimeType;    // Removed other fields for brevity    public String getMimeType() {        return mimeType;    }    public void setMimeType(String mimeType) {        this.mimeType = mimeType;    }    @Override    public String toString() {        ObjectMapper mapper = new ObjectMapper();        try {            return mapper.writeValueAsString(this);        } catch (IOException e) {            throw new IllegalStateException("Cannot convert object of type "   this.getClass().toString()   " to JSON", e);        }    }}

一个具体的类扩展了抽象：

public class EpubBookmarkJsonModel extends AbstractBookmarkJsonModel {    private static final long serialVersionUID = 1L;    // Removed other fields for brevity    public EpubBookmarkJsonModel() {        this.mimeType = "application/epub zip";    }}

问题是当我序列化这个JSON时,我得到一个重复的mimeType字段：

{  "mimeType": "application/epub zip",  "mimeType": "application/epub zip",  "userId": 24,  "acid": "ACID-000000000029087",  "added": "2013-08-14T12:02:17Z",  "epubBookmarkId": 34,  "cfi": "epubcfi(/6/4!/2/68)",  "context": "CONTEXT"}

我已经尝试使用previous answers的建议来使用@JsonAutoDetect注释来指定只应该使用类上的字段以及在ObjectMapper上设置相同的字段,但是这不能解决问题.

注解：

@JsonAutoDetect(fieldVisibility = JsonAutoDetect.Visibility.ANY, getterVisibility = JsonAutoDetect.Visibility.NONE,        setterVisibility = JsonAutoDetect.Visibility.NONE, creatorVisibility = JsonAutoDetect.Visibility.NONE,        isGetterVisibility = JsonAutoDetect.Visibility.NONE)

ObjectMapper：

    ObjectMapper mapper = new ObjectMapper();    mapper.getSerializationConfig().getDefaultVisibilityChecker()            .withFieldVisibility(JsonAutoDetect.Visibility.ANY)            .withGetterVisibility(JsonAutoDetect.Visibility.NONE)            .withSetterVisibility(JsonAutoDetect.Visibility.NONE)            .withCreatorVisibility(JsonAutoDetect.Visibility.NONE);

解决方法:

我通过在@JsonTypeInfo注释中使用JsonTypeInfo.As.EXISTING_PROPERTY解决了这个问题.

该项目是开源的,请在此处查看：ANS.java

来源：https://www.icode9.com/content-1-488401.html