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How to implement custom JSON serialization with Gson in Java?
A Gson library provides a way to specify custom serializers by registering a custom serializer with the GsonBuilder if we need a way to convert a java object to JSON. We can create a custom serializer by overriding the serialize() method of com.google.gson.JsonSerializer class.
In the below example, the implementation of custom serialization of JSON.
Example
import java.lang.reflect.Type;
import com.google.gson.*;
public class CustomJSONSerializerTest {
public static void main(String[] args) {
Gson gson = new GsonBuilder().registerTypeAdapter(Password.class, new PasswordSerializer())
.setPrettyPrinting().create();
Student student = new Student("Adithya", "Jai", 25, "Chennai");
student.setPassword(new Password("admin@123"));
System.out.println(gson.toJson(student));
}
}
class PasswordSerializer implements JsonSerializer {
@Override
public JsonElement serialize(Password src, Type typeOfSrc, JsonSerializationContext context) {
return new JsonPrimitive(new StringBuffer(src.getPassword()).toString());
}
}
// Student class
class Student {
private String firstName;
private String lastName;
private int age;
private String address;
private Password password;
public Student(String firstName, String lastName, int age, String address) {
super();
this.firstName = firstName;
this.lastName = lastName;
this.age = age;
this.address = address;
}
public String getFirstName() {
return firstName;
}
public void setFirstName(String firstName) {
this.firstName = firstName;
}
public String getLastName() {
return lastName;
}
public void setLastName(String lastName) {
this.lastName = lastName;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
public Password getPassword() {
return password;
}
public void setPassword(Password password) {
this.password = password;
}
public String toString() {
return "Student[ " +
"firstName = " + firstName +
", lastName = " + lastName +
", age = " + age +
", address = " + address +
" ]";
}
}
// Password class
class Password {
private String password;
public Password(String password) {
super();
this.password = password;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
}Output
{
"firstName": "Adithya",
"lastName": "Jai",
"age": 25,
"address": "Chennai",
"password": "admin@123"
}
Updated on: 04-Jul-2020
891 Views
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