Jackson Serialize Field to Different Name

Question

I have this JSON to deserialize:

{
    \"first-name\": \"Alpha\",
    \"last-name\": \"Beta\",
    \"gender\": \"m\"
}

I want to serialize

Answer 1

There is a far easier way to do this - create an objectmapper that uses the "addMixin" function.

Class to be serialized:

Class YouWantToSerializeMe {

    public String firstName;
    public String lastName;
    public String gender;

    @JsonProperty("firstName")
    public String getFirstNameCC() {
        return firstName;
    }

    @JsonProperty("lastName")
    public String getLastNameCC() {
    return lastName;
    }
}

Now, to serialize using both the built-in field names and custom field names, you can do this:

Class DoTheSerializing {

    String serializeNormally(YouWantToSerializeMe me) {
         ObjectMapper objectMapper = new ObjectMapper();
         ObjectWriter objectWriter = objectMapper.writer();

         return objectWriter(me)
     }

    String serializeWithMixin(YouWantToSerializeMe me) {
         ObjectMapper objectMapper = new ObjectMapper();
         ObjectWriter objectWriter = objectMapper
                 .addMixIn(YouWantToSerializeMe.class, MyMixin.class)
                 .writer();

         return objectWriter(me)
    }

    interface MyMixin {

         @JsonProperty("first-name")
         public String getFirstNameCC();

         @JsonProperty("last-name")
         public String getLastNameCC();
    }    

}

This uses an embedded interface in the class to keep things very local. You can make lots of optimizations around this, such as creating a static ObjectMapper and loading/unloading the mixin.

Using the interface as a "template" to control the mapping function is really powerful. You can add things at both the field and class level.