How to convert Map to JSON object using JSON-lib API in Java?

JSONObjectis an unordered collection ofname/valuepairs, whileMapis a mapping key Objects to values. The map cannot containduplicatekeys, and each key can be mapped to at most one value. We need to use theJSON-liblibrary toserializeanddeserializethe map in JSON format. Initially, we can create a POJO class and pass the instance as parameter to theput()method of theMapclass and finally add this map instance to theaccumulateAll JSONObject Methods.

public void accumulateAll(Map map)

Copy after login

import java.util.*; import net.sf.json.JSONObject; public class ConvertMapToJSONObjectTest { public static void main(String[] args)throws Exception { JSONObject jsonObject = new JSONObject(); Map employees = new HashMap(); employees.put(1, new Employee("Adithya", "Jai", 30)); employees.put(2, new Employee("Vamsi", "Krishna", 28)); employees.put(3, new Employee("Chaitanya", "Sai", 30)); jsonObject.accumulateAll(employees); System.out.println(jsonObject.toString(3)); // pretty print JSON } public static class Employee { private String firstName, lastName; private int age; public Employee(String firstName, String lastName, int age) { super(); this.firstName = firstName; this.lastName = lastName; this.age = age; } public String getFirstName() { return firstName; } public String getLastName() { return lastName; } public int getAge() { return age; } } }

Copy after login

{ "1": { "firstName": "Adithya", "lastName": "Jai", "age": 30 }, "2": { "firstName": "Vamsi", "lastName": "Krishna", "age": 28 }, "3": { "firstName": "Chaitanya", "lastName": "Sai", "age": 30 } }

Copy after login

The above is the detailed content of How to convert Map to JSON object using JSON-lib API in Java?. For more information, please follow other related articles on the PHP Chinese website!