How can I import data to Mongodb from Json file using java

Question

I am struggling with importing data into Mongodb from a Json file.
I can do the same in command line by using mongoimport command.
I explored and tried lot but not able to import from Json file using java.

sample.json

    { "test_id" : 1245362, "name" : "ganesh", "age" : "28", "Job" : 
       {"company name" : "company1", "designation" : "SSE" } 
    }

    { "test_id" : 254152, "name" : "Alex", "age" : "26", "Job" :
       {"company name" : "company2", "designation" : "ML" } 
    }

Thank for your time. ~Ganesh~

Answer 1

Suppose you can read the JSON string respectively. For example, you read the first JSON text

{ "test_id" : 1245362, "name" : "ganesh", "age" : "28", "Job" : 
   {"company name" : "company1", "designation" : "SSE" } 
}

and assign it to a variable (String json1), the next step is to parse it,

DBObject dbo = (DBObject) com.mongodb.util.JSON.parse(json1);

put all dbo into a list,

List<DBObject> list = new ArrayList<>();
list.add(dbo);

then save them into database:

new MongoClient().getDB("test").getCollection("collection").insert(list);

EDIT:

In the newest MongoDB Version you have to use Documents instead of DBObject, and the methods for adding the object look different now. Here's an updated example:

Imports are:

import com.mongodb.MongoClient;
import com.mongodb.client.MongoDatabase;
import org.bson.Document;

The code would like this (refering to the text above the EDIT):

Document doc = Document.parse(json1);
new MongoClient().getDataBase("db").getCollection("collection").insertOne(doc);

you can also do it the way with the list. but then you need

new MongoClient().getDataBase("db").getCollection("collection").insertMany(list);

But I think there is a problem with this solution. When you type:

db.collection.find()

in the mongo shell to get all objects in the collection, the result looks like the following:

{ "_id" : ObjectId("56a0d2ddbc7c512984be5d97"),
    "test_id" : 1245362, "name" : "ganesh", "age" : "28", "Job" :
        { "company name" : "company1", "designation" : "SSE" 
    }
}

which is not exactly the same as before.