Convert Java Object to Json String using Jackson API

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
• JACKSON API

In this article, Java object is converted into the JSON using Jackson API:

The steps to do this are as follows:

1. Add jar files of Jackson (in case of Maven project add Jackson dependencies in pom.xml file)
   filter_none

   edit
   close

   play_arrow

   link
   brightness_4
   code

   <dependency>         <groupId>com.fasterxml.jackson.core</groupId>         <artifactId>jackson-databind</artifactId>         <version>2.5.3</version> </dependency>

   chevron_right

   filter_none

   Below is the screenshot showing this step:
   

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

   Java Class

   filter_none

   edit
   close

   play_arrow

   link
   brightness_4
   code

   package com.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 + "]";     } }

   chevron_right

   filter_none

   Below is the screenshot showing this step:
   

3. Create a Java class for converting the Organisation object into JSON. Convert the object into JSON using ObjectMapper class of Jackson API.
   filter_none

   edit
   close

   play_arrow

   link
   brightness_4
   code

   package com.Geeks;    import java.io.IOException; import org.codehaus.jackson.map.ObjectMapper; import com.Geeks.Organisation;    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);            // Creating Object of ObjectMapper define in Jakson Api         ObjectMapper Obj = new ObjectMapper();            try {                // get Oraganisation object as a json string             String jsonStr = Obj.writeValueAsString(org);                // Displaying JSON String             System.out.println(jsonStr);         }            catch (IOException e) {             e.printStackTrace();         }     }        // Get the data to be inserted into the object     public static getObjectData(Organisation org)     {            // Insert the data         org.setName("GeeksforGeeks");         org.setDescription("A computer Science portal for Geeks");         org.setEmployees(2000);            // Return the object         return org;     }

   chevron_right

   filter_none

4. Execute the process.
5. The output in the JSON will be as below:

   Output
   {
     "organisation_name" : "GeeksforGeeks",
     "description" : "A computer Science portal for Geeks",
     "Employee" : "2000"
   }
   

   Below is the screenshot showing this output:
   

---

---