JSON field names, changing them on output - json

Question

I have a json which i map to an object as follows:
original json:
{
"amount_predicted" : 1.34
}
mapped:
public class Amount {
#JsonProperty("amount_predicted")
private BigDecimal amountPredicted;
}
I do some work and check this amount and then send this to the client. The issue i have is i want the name of the field to be camelcase on output. But since i already use the json property it wont do that.
This is what id like:
{
"amountPredicted" : 1.34
}

Answer 1

You can annotate the getter and the setter of the amountPredicted field in the Amount class respectively with #JsonProperty("amount_predicted") and #JsonProperty("amountPredicted") annotations thus differentiating the property's name in the deserialization process from the one used for the serialization:
public class Amount {
private BigDecimal amountPredicted;
#JsonProperty("amount_predicted")
public void setAmountPredicted(BigDecimal amountPredicted) {
this.amountPredicted = amountPredicted;
}
#JsonProperty("amountPredicted")
public BigDecimal getAmountPredicted() {
return amountPredicted;
}
}
Amount amount = mapper.readValue(json, Amount.class);
//it will print {"amountPredicted":1.34}
System.out.println(mapper.writeValueAsString(amount));
EDIT: as pointed out by #user1555190 is much simpler to use the JsonAlias annotation:
public class Amount {
#JsonAlias(value = {"amount_predicted"})
private BigDecimal amountPredicted;
}