JAVA EXAMPLE PROGRAMS

JAVA EXAMPLE PROGRAMS

Publish Your Article Here

How to convert JSON string to Map using Jackson API?


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

Note: Refer How to convert Java object to JSON string? page for dependent libraries.

package com.java2novice.json.examples;

import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

import org.codehaus.jackson.map.ObjectMapper;
import org.codehaus.jackson.type.TypeReference;

public class JsonToMapEx {

	public static void main(String a[]){
		
		String jsonStr = "{\"name\":\"Nataraj\", \"job\":\"Programmer\"}";
		Map<String,String> resultMap = new HashMap<String,String>();
		ObjectMapper mapperObj = new ObjectMapper();
		
		System.out.println("Input Json: "+jsonStr);
		try {
			resultMap = mapperObj.readValue(jsonStr, 
							new TypeReference<HashMap<String,String>>(){});
			System.out.println("Output Map: "+resultMap);
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
}

Output:
Input Json: {"name":"Nataraj", "job":"Programmer"}
Output Map: {name=Nataraj, job=Programmer}
<< Previous Program | Next Program >>

Jackson JSON examples

  1. How to convert Java object to JSON string?
  2. How to convert JSON string to Java object?
  3. How to convert JSON string to Map using Jackson API?
  4. How to convert Map to JSON string using Jackson API?
  5. Enable JSON pretty print using Jackson API
  6. How to rename JSON properties using Jackson annotations?
  7. How to ignore JSON property using Jackson annotations?
  8. How to order JSON elements using Jackson annotations?
  9. How to ignore json empty or null values using Jackson API in java?
  10. How to handle date in Json using Jackson api in java?
  11. How to read specific json node in Jackson api (tree model)?
  12. Jackson API client - how to read json from URL?
Knowledge Centre
Interface and its usage
Interface is similar to a class which may contain method's signature only but not bodies and it is a formal set of method and constant declarations that must be defined by the class that implements it. Interfaces are useful for declaring methods that one or more classes are expected to implement, capturing similarities between unrelated classes without forcing a class relationship and determining an object's programming interface without revealing the actual body of the class.
Famous Quotations
If you don’t make mistakes, you’re not working on hard enough problems. And that’s a big mistake.
-- Frank Wilczek

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].

Most Visited Pages

Other Interesting Sites

Reference: Java™ Platform Standard Ed. 7 - API Specification | Java™ Platform Standard Ed. 8 - API Specification | Java is registered trademark of Oracle.
Privacy Policy | Copyright © 2020 by Nataraja Gootooru. All Rights Reserved.