Eran Morad :
I have Jackson annotated class like this :
public class MyClass {
String field1;
@JsonIgnore
String field2;
String field3;
@JsonIgnore
String field4;
}
Assume that I cannot change MyClass code. Then, how can I make ObjectMapper override the JsonIgnore for field2 only and serialize it to json ? I want it to ignore field4 though. Is this easy and few lines of code ?
My code for regular serialization :
public String toJson(SomeObject obj){
ObjectWriter ow = new ObjectMapper().writer().withDefaultPrettyPrinter();
String json = null;
try {
json = ow.writeValueAsString(obj);
} catch (JsonProcessingException e) {
e.printStackTrace();
}
return json;
}
Michał Ziober :
You can use MixIn feature:
import com.fasterxml.jackson.annotation.JsonIgnore;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.SerializationFeature;
public class JsonApp {
public static void main(String[] args) throws Exception {
ObjectMapper mapper = new ObjectMapper();
mapper.enable(SerializationFeature.INDENT_OUTPUT);
mapper.addMixIn(MyClass.class, MyClassMixIn.class);
System.out.println(mapper.writeValueAsString(new MyClass()));
}
}
interface MyClassMixIn {
@JsonProperty
String getField2();
}
Above code prints:
{
"field1" : "F1",
"field2" : "F2",
"field3" : "F3"
}
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