JSON to Map using Jackson

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In this tutorial we are going to see how to convert JSON into Map and retrieve the values  
1. Create project called JSONExample.
2. Create package called com.javatutorialscorner.jackson 
3. add jackson-mapper-asl-1.9.13.jar, jackson-core-asl-1.9.13.jar into build path.
4. Create java class called JSONToMapExample under com.javatutorialscorner.jackson
JSONToMapExample.java

package com.javatutorialscorner.jackson;

import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Map;

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

public class JSONToMapExample {

 /**
  * @param args
  */
 public static void main(String[] args) {
  // TODO Auto-generated method stub
  ObjectMapper mapper = null;

  Map<String, Object> map = null;

  ArrayList<String> tutorials = null;

  try {
   mapper = new ObjectMapper();

   map = mapper.readValue(
     new File("C:\\jtc\\javatutorialscorner.json"),
     new TypeReference<Map<String, Object>>() {
     });
   System.out.println("Name : " + map.get("name"));
   System.out.println("Rank : " + map.get("rank"));

   tutorials = (ArrayList<String>) map.get("tutorials");

   for (String tutorial : tutorials) {
    System.out.println("Tutorial : " + tutorial);
   }
  } catch (JsonParseException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  } catch (JsonMappingException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  } catch (IOException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }

 }

}

Now run the program see the following output in console.

Name : Java Tutorials Corner

Rank : 1


Tutorial : Java


Tutorial : Servlet


Tutorial : JSP


Tutorial : Struts 1.x


Tutorial : Struts 2.x


Tutorial : Spring


Tutorial : Hibernate


Tutorial : Log4j


Tutorial : JSON


Tutorial : Web Services


Tutorial : JSF


Tutorial : Eclipse

Jackson Java JSON 10/18/2013 08:33:00 pm