BE THE CODER > JSON > GOOGLE GSON Examples > Custom Field Names Strategy

Google-gson is a java library from Google for encoding and decoding JSON text. Get the latest binaries from http://code.google.com/p/google-gson/. The following example shows registering a custom field name strategy by providing an implementation of FieldNamingStrategy interface.

File Name :

com/bethecoder/tutorials/google_gson/common/Student.java


package com.bethecoder.tutorials.google_gson.common;



import java.util.Date;



public class Student {

  private String firstName;

  private String lastName;

  private int age;

  private String hobby;

  private Date dob;



  public Student(String firstName, String lastName, int age, String hobby,

      Date dob) {

    super();

    this.firstName = firstName;

    this.lastName = lastName;

    this.age = age;

    this.hobby = hobby;

    this.dob = dob;

  }

  

  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 getHobby() {

    return hobby;

  }



  public void setHobby(String hobby) {

    this.hobby = hobby;

  }

  public Date getDob() {

    return dob;

  }

  public void setDob(Date dob) {

    this.dob = dob;

  }



  public String toString() {

    return "Student[ " +

      "firstName = " + firstName +

      ", lastName = " + lastName +

      ", age = " + age +

      ", hobby = " + hobby +

      ", dob = " + dob +

      " ]";

  }

}

File Name :	com/bethecoder/tutorials/google_gson/tests/FieldNameStrategyTest.java
Author :	Sudhakar KV
Email :	[email protected]


package com.bethecoder.tutorials.google_gson.tests;



import java.lang.reflect.Field;

import java.util.Date;



import com.bethecoder.tutorials.google_gson.common.Student;

import com.google.gson.FieldNamingStrategy;

import com.google.gson.Gson;

import com.google.gson.GsonBuilder;





public class FieldNameStrategyTest {



  /**

   * @param args

   */

  public static void main(String[] args) {

    Gson gson = new GsonBuilder()

      .setFieldNamingStrategy(new CustomStrategy()) //Register custom strategy

      .setPrettyPrinting().create();

    Student stud = new Student("Sriram", "Kasireddi", 2, "Singing", new Date(110, 4, 6));

    System.out.println(gson.toJson(stud));          

  }



}



class CustomStrategy implements FieldNamingStrategy {



  @Override

  public String translateName(Field field) {

    return "json_" + field.getName().toLowerCase();

  }

  

}