MongoDB comes with “com.mongodb.util.JSON” class to convert JSON data directly to a DBObject. For example, data represent in JSON format :

{
	'name' : 'mkyong',
	'age' : 30
}

To convert it to DBObject, you can code like this :

DBObject dbObject = (DBObject) JSON.parse("{'name':'mkyong', 'age':30}");
Example

See a full example to convert above JSON data to a DBObject, and save it into MongoDB.

package com.mkyong.core;
 
import java.net.UnknownHostException;
import com.mongodb.DB;
import com.mongodb.DBCollection;
import com.mongodb.DBCursor;
import com.mongodb.DBObject;
import com.mongodb.Mongo;
import com.mongodb.MongoException;
import com.mongodb.util.JSON;
 
/**
 * Java MongoDB : Convert JSON data to DBObject
 * 
 */
 
public class App {
	public static void main(String[] args) {
 
		try {
 
			Mongo mongo = new Mongo("localhost", 27017);
			DB db = mongo.getDB("yourdb");
			DBCollection collection = db.getCollection("dummyColl");
 
			// convert JSON to DBObject directly
			DBObject dbObject = (DBObject) JSON
					.parse("{'name':'mkyong', 'age':30}");
 
			collection.insert(dbObject);
 
			DBCursor cursorDoc = collection.find();
			while (cursorDoc.hasNext()) {
				System.out.println(cursorDoc.next());
			}
 
			System.out.println("Done");
 
		} catch (UnknownHostException e) {
			e.printStackTrace();
		} catch (MongoException e) {
			e.printStackTrace();
		}
	}
}

Output

{ "_id" : { "$oid" : "4dc9ebb5237f275c2fe4959f"} , "name" : "mkyong" , "age" : 30}
Done
Note : You can find more similar articles at - Java MongoDB Tutorials
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