kiRach kiRach - 4 months ago 61
JSON Question

Different names of JSON property during serialization and deserialization

Is it possible: to have one field in class, but different names for it during serialization/deserialization in Jackson library?

For example, I have class "Coordiantes".

class Coordinates{
int red;
}


For deserealization from JSON want to have format like this:

{
"red":12
}


But when I will serialize object, result should be like this one:

{
"r":12
}


I tried to implement this by applying @JsonProperty annotation both on getter and setter(with different values):

class Coordiantes{
int red;

@JsonProperty("r")
public byte getRed() {
return red;
}

@JsonProperty("red")
public void setRed(byte red) {
this.red = red;
}
}


but I got an exceoption:

org.codehaus.jackson.map.exc.UnrecognizedPropertyException: Unrecognized field "red"


UPDATE: Thanks for participants, I've found the solution, which suits me.

class Coordinates{
@JsonIgnore
public byte getRed() {
return red;
}

@JsonProperty("red")
public void setRed(byte red) {
this.red = red;
}

@JsonProperty("r")
public byte getR() {
return red;
}
}

Answer

Just tested and this works:

public class Coordinates {
    byte red;

    @JsonProperty("r")
    public byte getR() {
      return red;
    }

    @JsonProperty("red")
    public void setRed(byte red) {
      this.red = red;
    }
}

The idea is that method names should be different, so jackson parses it as different fields, not as one field.

Here is test code:

Coordinates c = new Coordinates();
c.setRed((byte) 5);

ObjectMapper mapper = new ObjectMapper();
System.out.println("Serialization: " + mapper.writeValueAsString(c));

Coordinates r = mapper.readValue("{\"red\":25}",Coordinates.class);
System.out.println("Deserialization: " + r.getR());

Result:

Serialization: {"r":5}
Deserialization: 25
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