Monday 21 March 2016

Create Json from Java object

In this post you will learn how to Create Json from Java object 

Step1: Add maven dependency.

<dependency>
        <groupId>org.codehaus.jackson</groupId>
        <artifactId>jackson-mapper-asl</artifactId>
        <version>1.9.13</version>

Step2: Create a pojo model class

public class Employee
{
   private Integer id;
   private String firstName;
   public Employee(){}
   public Employee(Integer id, String name){
      this.id = id;
      this.name = name;
   }
   public Integer getId(){
      return id;
   }
   public void setId(Integer id){
      this.id = id;
   }
   public String getFirstName(){
      return name;
   }
   public void setFirstName(String name){
      this.name = name;
   }
@Override
   public String toString()
   {
      return "Employee [id=" + id + ", name=" + name "]";

   }
}

Step3: Create Json from Java Object

package com.sumit.jackson;
import java.io.File;
import java.io.IOException;
import org.codehaus.jackson.JsonGenerationException;
import org.codehaus.jackson.map.JsonMappingException;
import org.codehaus.jackson.map.ObjectMapper;
public class JSONToJavaExample
{
   public static void main(String[] args){
      Employee employee = new Employee(1, "Sumit Kumar");
      ObjectMapper mapper = new ObjectMapper();
      try{
         mapper.writeValue(new File("/home/sumit/employee.json"), employee);
      } catch (JsonGenerationException e){
         e.printStackTrace();
      } catch (JsonMappingException e){
         e.printStackTrace();
      } catch (IOException e){
         e.printStackTrace();
      }
   }
}
Output:
//In employee.json file below content will be written
{"id":1,"name":"Sumit Kumar"}



Thanks
Sumit Kumar

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