Jackson使用mixins以动态不同的名称序列化属性 [英] Jackson serialize property with dynamically different names using mixins
问题描述
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。例如,在 OrientDB
中,id被命名为@rid
@JsonProperty(@ rid)
private String id;
对于MongoDB,id名为_id
@JsonProperty(@_ id)
private String id;
我不知道现代数据库开发人员有什么问题,不只是命名id字段id ^^。但现在我有一个问题。如何在某些情况下动态序列化/反序列化id字段为@rid,在另一种情况下为_id?
编辑:
根据rmullers建议我尝试使用mixins。所以我有例如:
public interface IdMixins {
}
public interface MongoIdMixIn extends IdMixins {
@JsonProperty(_ id)String getId();
@JsonProperty(_ id)void setId(String id);
}
公共接口OrientIdMixIn扩展IdMixins {
@JsonProperty(@ rid)String getId();
@JsonProperty(@ rid)void setId(String id);
}
其中IdMixins是一个完全空的接口,用于获得更多控制,哪些接口可以可以映射到映射器。
然后有一个类:
@JsonTypeInfo(使用= JsonTypeInfo.Id.CLASS,包括= JsonTypeInfo.As.PROPERTY,财产= @ javaClass)
公共抽象类AbstractBean实现Serializable {
私有静态最后的serialVersionUID长= -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,输出是仍然是id:
public class MixinTest {
public static void main(String [] args)抛出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));
}
公共静态类Foo扩展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}
'的div类= h2_lin>解决方案
你尝试过使用 HTTP://维基.fasterxml.com / JacksonMixInAnnotations ?然后可以使用一个 OrientDbMixin
和 MongoDbMixin
具有不同 @JsonProperty
配置。
更新:工作示例
公共最终课程JacksonTest {
静态最终类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;
}
}
公共接口MongoIdMixIn {
@JsonProperty(_ id)String getId();
}
公共接口OrientIdMixIn {
@JsonProperty(@ rid)String getId();
}
private final static Logger LOG = LoggerFactory.getLogger();
public static void main(String [] args)抛出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));
}
}
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;
And for MongoDB the id is named "_id"
@JsonProperty("@_id")
private String 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"?
EDIT:
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);
}
Where IdMixins is a completly empty interface just used to get more controll which interfaces can be passet to the mapper.
Then there is a class:
@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;
}
}
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;
}
}
}
Outputs:
{"@javaClass":"test.MixinTest$Foo","id":"123","bar":"lala","@class":"Foo"} {"@javaClass":"test.MixinTest$Foo","id":"123","bar":"lala","@class":"Foo"}
Have you tried using http://wiki.fasterxml.com/JacksonMixInAnnotations? Then you can use an OrientDbMixin
and a MongoDbMixin
with different @JsonProperty
configuration.
Update: Working example
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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