如何将jsonNode转换为BasicDbList

Question

I have a JsonNode object and I need to convert that to a BasicDBList of mongoDb. How do I do that? I need to get the JsonNode as a list for my further iterations. Here is my JsonNode :

JsonNode rnode={"question":"q0009_d2","answers[{"answers":"\"Good\""}],"ranking":"false","other":""} 

Here's my attempt at converting it:

BasicDBList newlist=new BasicDBList();
newlist.add(rnode);

But the newlist was empty:

o/p: newlist is `[ [ [ ] , [ [ [ ]]] , [ ] , [ ]]]`

How do I do the conversion?

Answer 1

I am not work more on JsonNode but following simple java code will help you.

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;

and java code as below

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':'abc', 'age':12}");

    collection.insert(dbObject);

    DBCursor cursorDoc = collection.find();
} catch (UnknownHostException e) {
    e.printStackTrace();
} catch (MongoException e) {
    e.printStackTrace();
}

In above code com.mongodb.util.JSON; parse given string to JSON and convert to DBObject , then it insert to collection

Answer 2

Assuming you have an array of such json nodes, The below code sample may help you else it does not make sense to convert an object into a list

JsonNode root = rnode; //yourJsonNode
Iterator<JsonNode> iter = root.getElements();
  while ( iter.hasNext() ){
//create basicDB objects
// add them to basicDBList
}