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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.util.HashMap;
import java.util.Map;

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

Input Json: {"name":"Nataraj", "job":"Programmer"}
Output Map: {name=Nataraj, job=Programmer}
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What is adapter class?
An adapter class provides the default implementation of all methods in an event listener interface. Adapter classes are very useful when you want to process only few of the events that are handled by a particular event listener interface. You can define a new class by extending one of the adapter classes and implement only those events relevant to you.
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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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