我使用不同的 NoSQL
数据库,根据数据库,我需要将id"命名为不同的.因此,例如在 OrientDB
中,id 被命名为@rid"
I use different NoSQL
databases and depending on the database I need to name the "id" different. So for example in OrientDB
the id is named "@rid"
@JsonProperty("@rid")
private String id;
对于 MongoDB,id 被命名为_id"
And for MongoDB the id is named "_id"
@JsonProperty("@_id")
private String id;
我不知道现代数据库开发人员有什么问题,而不仅仅是将 id 字段命名为id"^^.但现在我有一个问题.如何动态序列化/反序列化 id 字段,在某些情况下为@rid",在另一种情况下为_id"?
I do not know what is wrong with the modern DB developers not just naming the id field "id" ^^. But now I have a problem. How can I dynamically serialize/deserialize the id field in some case as "@rid" and in another case as "_id"?
根据 rmullers 的建议,我尝试使用 mixins.所以我有例如:
Based on rmullers suggestion I have tried to use mixins. So I have for example:
public interface IdMixins {
}
public interface MongoIdMixIn extends IdMixins {
@JsonProperty("_id") String getId();
@JsonProperty("_id") void setId(String id);
}
public interface OrientIdMixIn extends IdMixins{
@JsonProperty("@rid") String getId();
@JsonProperty("@rid") void setId(String id);
}
IdMixins 是一个完全空的接口,仅用于更好地控制哪些接口可以传递给映射器.
Where IdMixins is a completly empty interface just used to get more controll which interfaces can be passet to the mapper.
然后有一个类:
@JsonTypeInfo(use=JsonTypeInfo.Id.CLASS, include=JsonTypeInfo.As.PROPERTY, property="@javaClass")
public abstract class AbstractBean implements Serializable {
private static final long serialVersionUID = -1286900676713424199L;
// @JsonProperty("@rid")
private String id;
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
}
但是当我运行这个简单的测试时,输出仍然是id":
But when I run this simple test, the output is still "id":
public class MixinTest {
public static void main(String[] args) throws JsonProcessingException {
Foo f = new Foo();
f.setId("123");
f.setBar("lala");
ObjectMapper mapper = new ObjectMapper();
ObjectMapper m2 = mapper.copy();
m2.addMixInAnnotations(AbstractBean.class, MongoIdMixIn.class);
System.out.println(m2.writeValueAsString(f));
ObjectMapper m3 = mapper.copy();
m3.addMixInAnnotations(AbstractBean.class, OrientIdMixIn.class);
System.out.println(m3.writeValueAsString(f));
}
public static class Foo extends AbstractBean {
private String bar;
public String getBar() {
return bar;
}
public void setBar(String bar) {
this.bar = bar;
}
}
}
输出:
{"@javaClass":"test.MixinTest$Foo","id":"123","bar":"lala","@class":"Foo"}{"@javaClass":"test.MixinTest$Foo","id":"123","bar":"lala","@class":"Foo"}
{"@javaClass":"test.MixinTest$Foo","id":"123","bar":"lala","@class":"Foo"} {"@javaClass":"test.MixinTest$Foo","id":"123","bar":"lala","@class":"Foo"}
你试过使用 http://wiki.fastxml.com/JacksonMixInAnnotations?然后,您可以使用具有不同 @JsonProperty
配置的 OrientDbMixin
和 MongoDbMixin
.
Have you tried using http://wiki.fasterxml.com/JacksonMixInAnnotations? Then you can use an OrientDbMixin
and a MongoDbMixin
with different @JsonProperty
configuration.
更新:工作示例
public final class JacksonTest {
static final class ExampleBean {
private String id;
private String bar;
@JsonProperty("donotwanttoseethis")
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getBar() {
return bar;
}
public void setBar(String bar) {
this.bar = bar;
}
}
public interface MongoIdMixIn {
@JsonProperty("_id") String getId();
}
public interface OrientIdMixIn {
@JsonProperty("@rid") String getId();
}
private final static Logger LOG = LoggerFactory.getLogger();
public static void main(String[] args) throws JsonProcessingException {
ExampleBean bean = new ExampleBean();
bean.setId("1234");
bean.setBar("lala");
ObjectMapper m2 = new ObjectMapper();
m2.addMixInAnnotations(ExampleBean.class, MongoIdMixIn.class);
LOG.info(m2.writeValueAsString(bean));
ObjectMapper m3 = new ObjectMapper();
m3.addMixInAnnotations(ExampleBean.class, OrientIdMixIn.class);
LOG.info(m3.writeValueAsString(bean));
}
}
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