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Convert Java Object to Json String using GSON

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  • Last Updated : 25 Jul, 2022
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JSON Stand for JavaScript Object Notation. It’s a standard text-based format which shows structured data based on JavaScript object syntax. It is commonly used for transmitting data in web applications. JSON is highly recommended to transmit data between a server and web application. To convert a Java object into JSON, the following methods can be used:

  • GSON: It is an open-source Java library which is used to serialize and deserialize Java objects to JSON.
  • Jackson API

In this article, Java object is converted into the JSON using GSON: The steps to do this are as follows:

  • Add jar files of Jackson (in case of Maven project add Gson dependencies in the pom.xml file) 

html




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


Below is the screenshot showing this step:-

  • Create a POJO (Plain Old Java Object) to be converted into JSON 

Java




package GeeksforGeeks.Geeks;
 
public class Organisation {
    private String organisation_name;
    private String description;
    private int Employees;
 
    // Calling getters and setters
    public String getOrganisation_name()
    {
        return organisation_name;
    }
 
    public void setOrganisation_name(String organisation_name)
    {
        this.organisation_name = organisation_name;
    }
 
    public String getDescription()
    {
        return description;
    }
 
    public void setDescription(String description)
    {
        this.description = description;
    }
 
    public int getEmployees()
    {
        return Employees;
    }
 
    public void setEmployees(int employees)
    {
        Employees = employees;
    }
 
    // Creating toString
    @Override
    public String toString()
    {
        return "Organisation [organisation_name="
            + organisation_name
            + ", description="
            + description
            + ", Employees="
            + Employees + "]";
    }
}


Below is the screenshot showing this step:-

  • Create a Java class for converting the Organisation object into JSON. 

Java




package GeeksforGeeks.Geeks;
 
import com.google.gson.Gson;
 
public class ObjectToJson {
    public static void main(String[] a)
    {
 
        /**Creating object of Organisation **/
        Organisation org = new Organisation();
 
        /** Insert the data into the object **/
        org = getObjectData(org);
 
        System.out.println("Json representation"
                           + " of Object organisation is ");
        // In the below line
        // we have created a New Gson Object
        // and call it's toJson inbuid function
        // and passes the object of organisation
        System.out.println(new Gson().toJson(org));
    }
 
    /** Get the data to be inserted into the object **/
    public static Organisation getObjectData(Organisation org)
    {
 
        /**insert the data**/
        org.setOrganisation_name("GeeksforGeeks");
        org.setDescription("A computer Science portal for Geeks");
        org.setEmployees(2000);
 
        /**Return Object**/
        return org;
    }
}


Below is the screenshot showing this step:-

  • Execute the process
  • Output Json
Output
{
  "organisation_name" : "GeeksforGeeks",
  "description" : "A computer Science portal for Geeks",
  "Employee" : "2000"
}

Below is the screenshot showing Output on Console:


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