JSON to HashMap Recursively and JSON to Object in Java | Code Factory

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JSON to HashMap Recursively

JsonToHashMap.java

package com.codeFactory;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import org.codehaus.jettison.json.JSONArray;
import org.codehaus.jettison.json.JSONObject;
/**
 * @author code.factory
 *
 */
public class JsonToHashMap {
public static void main(String args[]) throws Exception {
  JSONObject jsonObject = new JSONObject(
    "{\"A\":\"M1\",\"Data\":[ {\"B\":[{ \"B1\":\"111\",\"B2\":\"Warning \"},{ \"B1\":\"222\",\"B2\":\"Warning \"}],\"C\":[{\"c1\":\"IL2\",\"c2\":\"[0.750183,0.00933380975964486]\"},{\"c1\":\"IL1b\",\"c2\":\"[0.750183,-1.5216938335421]\"}]}]}");
  System.out.println(getMap(jsonObject));
 }
private static Map getMap(JSONObject object) {
  Map<String, Object> map = new HashMap<String, Object>();
Object jsonObject = null;
  String key = null;
  Object value = null;
try {
   Iterator<String> keys = object.keys();
   while (keys.hasNext()) {
key = null;
    value = null;
key = keys.next();
if (null != key && !object.isNull(key)) {
     value = object.get(key);
    }
if (value instanceof JSONObject) {
     map.put(key, getMap((JSONObject) value));
     continue;
    }
if (value instanceof JSONArray) {
     JSONArray array = ((JSONArray) value);
     List list = new ArrayList();
     for (int i = 0; i < array.length(); i++) {
      jsonObject = array.get(i);
      if (jsonObject instanceof JSONObject) {
       list.add(getMap((JSONObject) jsonObject));
      } else {
       list.add(jsonObject);
      }
     }
     map.put(key, list);
     continue;
    }
map.put(key, value);
   }
  } catch (Exception e) {
   System.out.println(e);
  }
  return map;
 }
}

JSON to Object

JsonToObject.java

package com.codeFactory;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import org.codehaus.jackson.JsonParseException;
import org.codehaus.jackson.map.JsonMappingException;
import org.codehaus.jackson.map.ObjectMapper;
import org.codehaus.jackson.map.type.TypeFactory;
/**
 * @author code.factory
 *
 */
public class JsonToObject {
public static void main(String[] args) {
String json = "[{\"fName\": \"Code\",\"lName\": \"Factory\"},{\"fName\": \"Emp Fname\",\"lName\": \"Emp Lname\"}]";
  ObjectMapper mapper = new ObjectMapper();
  List<Employee> list = new ArrayList<Employee>();
  try {
   list = mapper.readValue(json, TypeFactory.defaultInstance().constructCollectionType(List.class, Employee.class));
  } catch (JsonParseException e) {
   e.printStackTrace();
  } catch (JsonMappingException e) {
   e.printStackTrace();
  } catch (IOException e) {
   e.printStackTrace();
  }
System.out.println(list);
 }
}

Employee.java

package com.codeFactory;
/**
 * @author code.factory
 *
 */
public class Employee {
private String fName;
 private String lName;
public String getfName() {
  return fName;
 }
public void setfName(String fName) {
  this.fName = fName;
 }
public String getlName() {
  return lName;
 }
public void setlName(String lName) {
  this.lName = lName;
 }
@Override
 public String toString() {
  return "Author [fName : " + fName + ", lName : " + lName + "]";
 }
}