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How to convert Java object to JSON string?


This page shows how to convert java object to JSON string using Jackson's data binding.

As a first step add Jackson dependent jar file "jackson-mapper-asl" to your classpath. Here is the pom.xml file for your reference:

<project xmlns="http://maven.apache.org/POM/4.0.0" 
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 
    					http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>jackson_exmp</groupId>
  <artifactId>jackson_exmp</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <dependencies>
  	<dependency>
  		<groupId>org.codehaus.jackson</groupId>
  		<artifactId>jackson-mapper-asl</artifactId>
  		<version>1.9.10</version>
  	</dependency>
  </dependencies>
</project>

Create a simple Employee pojo. We will convert this pojo to JSON value. Note that we have already initialized the Employee class with default values.

package com.java2novice.json.models;

public class Employee {

	private int empId = 1016;
	private String name = "Nataraja Gootooru";
	private String designation = "Programmer";
	private String department = "Java2Novice";
	private int salary = 20000;
	
	public String toString(){
		StringBuilder sb = new StringBuilder();
		sb.append("************************************");
		sb.append("\nempId: ").append(empId);
		sb.append("\nname: ").append(name);
		sb.append("\ndesignation: ").append(designation);
		sb.append("\ndepartment: ").append(department);
		sb.append("\nsalary: ").append(salary);
		sb.append("\n************************************");
		return sb.toString();
	}
	
	public int getEmpId() {
		return empId;
	}
	public void setEmpId(int empId) {
		this.empId = empId;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public String getDesignation() {
		return designation;
	}
	public void setDesignation(String designation) {
		this.designation = designation;
	}
	public String getDepartment() {
		return department;
	}
	public void setDepartment(String department) {
		this.department = department;
	}
	public int getSalary() {
		return salary;
	}
	public void setSalary(int salary) {
		this.salary = salary;
	}	
}

Finally here is the example to convert java object to JSON string:

package com.java2novice.json.examples;

import java.io.IOException;

import org.codehaus.jackson.map.ObjectMapper;

import com.java2novice.json.models.Employee;

public class ObjectToJsonEx {

	public static void main(String[] a){
		
		Employee emp = new Employee();
		ObjectMapper mapperObj = new ObjectMapper();
		
		try {
			// get Employee object as a json string
			String jsonStr = mapperObj.writeValueAsString(emp);
			System.out.println(jsonStr);
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
}

Output:
{"empId":1016,"name":"Nataraja Gootooru","designation":"Programmer","department":"Java2Novice","salary":20000}
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Pass by value Vs Pass by reference
Pass by value: Passing a copy of the value, not the original reference.

Pass by reference: Passsing the address of the object, so that you can access the original object.
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About Author

I'm Nataraja Gootooru, programmer by profession and passionate about technologies. All examples given here are as simple as possible to help beginners. The source code is compiled and tested in my dev environment.

If you come across any mistakes or bugs, please email me to [email protected].

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Reference: Java™ Platform Standard Ed. 7 - API Specification | Java™ Platform Standard Ed. 8 - API Specification | Java is registered trademark of Oracle.
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