Java – Convert Object to Map example

By mkyong | Updated: October 29, 2016

Viewed: 69,227 (+148 pv/w)

Tags: convert jackson java map object

In Java, you can use the Jackson library to convert a Java object into a Map easily.

1. Get Jackson

<dependency>
	<groupId>com.fasterxml.jackson.core</groupId>
	<artifactId>jackson-databind</artifactId>
	<version>2.6.3</version>
</dependency>

2. Convert Object to Map

2.1 A Jackson 2 example to convert a Student object into a java.util.Map

package com.mkyong.examples;

import java.util.List;

public class Student {

    private String name;
    private int age;
    private List<String> skills;

    // getters setters
}

package com.mkyong.examples;

import com.fasterxml.jackson.databind.ObjectMapper;
import java.util.Arrays;
import java.util.Map;

public class ObjectToMapExample {

    public static void main(String[] args) {

        ObjectMapper oMapper = new ObjectMapper();

        Student obj = new Student();
        obj.setName("mkyong");
        obj.setAge(34);
        obj.setSkills(Arrays.asList("java","node"));

        // object -> Map
        Map<String, Object> map = oMapper.convertValue(obj, Map.class);
        System.out.println(map);

    }

}

Output

{name=mkyong, age=34, skills=[java, node]}

References

1. Jackson 2 – How to convert object to JSON
2. Jackson @Github
3. Jackson Home