Jackson Custom Serializer

0-CustomSerializationMain.java

package homo.efficio.json.jackson.custom.serialization;

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.module.SimpleModule;
import homo.efficio.json.jackson.custom.serialization.domain.CellPhone;
import homo.efficio.json.jackson.custom.serialization.domain.FamilyMember;
import homo.efficio.json.jackson.custom.serialization.domain.MobileVendor;
import homo.efficio.json.jackson.custom.serialization.serializer.CellPhoneSerializer;
import homo.efficio.json.jackson.custom.serialization.serializer.FamilyMemberSerializer;

import java.util.LinkedHashSet;
import java.util.Set;

/**
 * Created by HomoEfficio on 2016-10-22.
 */
public class CustomSerializationMain {

    public static void main(String[] args) throws JsonProcessingException {

        ObjectMapper objectMapper = getObjectMapper();

        FamilyMember 천하대장군 = getFamilyMember();

        System.out.println(objectMapper.writerWithDefaultPrettyPrinter().writeValueAsString(천하대장군));
    }

    private static ObjectMapper getObjectMapper() {

        ObjectMapper objectMapper = new ObjectMapper();

        SimpleModule simpleModule = new SimpleModule();
        simpleModule.addSerializer(FamilyMember.class, new FamilyMemberSerializer());
        simpleModule.addSerializer(CellPhone.class, new CellPhoneSerializer());

        objectMapper.registerModule(simpleModule);

        return objectMapper;
    }

    private static FamilyMember getFamilyMember() {

        FamilyMember 손녀딸1 = new FamilyMember(
                31L, "손녀딸", null, null
        );
        FamilyMember 손자2 = new FamilyMember(
                32L, "손자2", null, null
        );

        Set<FamilyMember> childrens1 = new LinkedHashSet<>();
        childrens1.add(손녀딸1);
        childrens1.add(손자2);
        FamilyMember 아들1 = new FamilyMember(
                21L, "아들1", new CellPhone("01087879898", MobileVendor.KT), childrens1
        );
        FamilyMember 며느리1 = new FamilyMember(
                22L, "며느리1", new CellPhone("01082825353", MobileVendor.SKT), childrens1
        );

        Set<FamilyMember> childrens = new LinkedHashSet<>();
        childrens.add(아들1);
        childrens.add(며느리1);
        return new FamilyMember(
                21L, "천하대장군", new CellPhone("01056561253", MobileVendor.LGT), childrens
        );
    }
}

1-FamilyMemberSerializer.java

package homo.efficio.json.jackson.custom.serialization.serializer;

import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.JsonSerializer;
import com.fasterxml.jackson.databind.SerializerProvider;
import homo.efficio.json.jackson.custom.serialization.domain.FamilyMember;

import java.io.IOException;

/**
 * Created by HomoEfficio on 2016-10-22.
 */
public class FamilyMemberSerializer extends JsonSerializer<FamilyMember> {

    @Override
    public void serialize(FamilyMember value, JsonGenerator gen, SerializerProvider serializers) throws IOException, JsonProcessingException {

        gen.writeStartObject();

        gen.writeFieldName("id");
        gen.writeString(String.valueOf(value.getId()));

        gen.writeFieldName("name");
        gen.writeString(value.getName());

        gen.writeFieldName("cellPhone");
        gen.writeObject(value.getCellPhone());

        gen.writeFieldName("children");
        gen.writeObject(value.getChildren());

        gen.writeEndObject();
    }
}

2-CellPhoneSerializer.java

package homo.efficio.json.jackson.custom.serialization.serializer;

import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.JsonSerializer;
import com.fasterxml.jackson.databind.SerializerProvider;
import homo.efficio.json.jackson.custom.serialization.domain.CellPhone;

import java.io.IOException;

/**
 * Created by HomoEfficio on 2016-10-22.
 */
public class CellPhoneSerializer extends JsonSerializer<CellPhone> {

    @Override
    public void serialize(CellPhone value, JsonGenerator gen, SerializerProvider serializers) throws IOException, JsonProcessingException {

        gen.writeStartObject();

        gen.writeFieldName("phoneNumber");
        gen.writeString(value.getNumber());

        gen.writeEndObject();
    }
}

3-FamilyMember.java

package homo.efficio.json.jackson.custom.serialization.domain;

import java.util.Set;

/**
 * Created by HomoEfficio on 2016-10-22.
 */
public class FamilyMember {

    private Long id;
    private String name;
    private CellPhone cellPhone;
    private Set<FamilyMember> children;

    public FamilyMember(Long id, String name, CellPhone cellPhone, Set<FamilyMember> children) {
        this.id = id;
        this.name = name;
        this.cellPhone = cellPhone;
        this.children = children;
    }

    public Long getId() {
        return id;
    }

    public String getName() {
        return name;
    }

    public CellPhone getCellPhone() {
        return cellPhone;
    }

    public Set<FamilyMember> getChildren() {
        return children;
    }
}

4-CellPhone.java

package homo.efficio.json.jackson.custom.serialization.domain;

/**
 * Created by hanmomhanda on 2016-10-22.
 */
public class CellPhone {

    private String number;

    private MobileVendor vendor;

    public CellPhone(String number, MobileVendor vendor) {
        this.number = number;
        this.vendor = vendor;
    }

    public String getNumber() {
        return number;
    }

    public MobileVendor getVendor() {
        return vendor;
    }
}

5-MobileVendor.java

package homo.efficio.json.jackson.custom.serialization.domain;

/**
 * Created by HomoEfficio on 2016-10-22.
 */
public enum MobileVendor {
    KT, SKT, LGT
}

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