import com.mongodb.MongoClient;
   import com.mongodb.MongoClientURI;
   import com.mongodb.client.MongoDatabase;
    public class Mongoconnect {
        public static void main(String args[]) {
            try {
                MongoClient mongoClient = new MongoClient(new MongoClientURI("mongodb://localhost:27017"));
                MongoDatabase database;
                database = mongoClient.getDatabase("test");
                System.out.println("Connect to database successfully");
            } catch (Exception e) {
                System.err.println(e.getClass().getName() + ": " + e.getMessage());
            }
        }
    }