Convert Java Object to Json using GSON

by Online Tutorials Library July 22, 2022

Convert Java Object to Json using GSON

JSON stands for JavaScript object notation, is a lightweight format for storing and transporting the data. It stores the data as the key-value pair. Most of the applications use this format for transmitting the data from the server to the web page, or vice-versa. However, we must convert the java object to JSON string to transmit it over the network. In Java, we can use the following methods to convert a Java object to Json.

GSON: It is a java library that contains methods to serialize and deserialize Java objects to JSON. It is open-source.
Jackson API

In this tutorial, we will convert the Java object to JSON using the GSON library. Consider the following steps to convert the Java object to JSON.

1. Create a maven project in eclipse and use pom.xml to add GSON dependencies.

  <dependency>   <groupId>com.google.code.gson</groupId>   <artifactId>gson</artifactId>   <version>2.6.2</version>   </dependency>  

2. Create a Plain Old Java Object (POJO) that is to be converted into Json. Consider the following java code to create the java object.

  package com.convertJSON;      public class Company {  private String companyName;  private String companyTagline;  private int employees;    public String getCompanyName() {  return companyName;  }    public void setCompanyName(String companyName) {  this.companyName = companyName;  }    public String getCompanyTagline() {  return companyTagline;  }    public void setCompanyTagline(String companyTagline) {  this.companyTagline = companyTagline;  }    public int getEmployees() {  return employees;  }    public void setEmployees(int employees) {  this.employees = employees;  }    @Override  public String toString() {  // TODO Auto-generated method stub  return “”Company [companyName “+ companyName + “, companyTagline = ” + companyTagline + “, employees = ” + employees + “]”;  }    }  

3. Create a java class that uses Gson class to convert the Company object to Json.

  package com.convertJSON;  import com.google.gson.Gson;  public class ConvertJSON {  public static Company getCompanyData(Company company) {  company.setCompanyName(“Tutoraspire”);  company.setCompanyTagline(“The Best Portal to Learn Technologies”);  company.setEmployees(1000);    return company;  }  public static void main(String[] args) {  // TODO Auto-generated method stub  Company company = new Company();  company = getCompanyData(company);  System.out.println(“The JSON representation of Object company is “);  System.out.println(new Gson().toJson(company));    }  }  

4. We will get the JSON object upon executing the ConvertJSON class. The generated JSON string is given below.

  The JSON representation of Object company is   {  “companyName”:”Tutoraspire”,  “companyTagline”:”The Best Portal to Learn Technologies”,  “employees”:1000  }  

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