Java code sample to connect to MongoDB.

driver-example.java

// Begin Java Program
import com.mongodb.Mongo;
import com.mongodb.DB;
import com.mongodb.DBCollection;
import com.mongodb.BasicDBObject;
import com.mongodb.DBObject;
import com.mongodb.DBCursor;
import com.mongodb.WriteConcern;



public class Test {
  public static void main(String[] args) {
    Mongo m;
    try {
      m = new Mongo("localhost", 27017);
      WriteConcern w = new WriteConcern( 1, 2000 );
      m.setWriteConcern( w );
    } catch (Exception e) {
      throw new RuntimeException(e);
    }

    DB db = m.getDB( "training" );
    DBCollection coll = db.getCollection( "messages" );

    for(int i=0; i<10; i++) {
      DBObject obj = new BasicDBObject();
      obj.put( "text", "Hello World!" );
      obj.put( "n", i );
      coll.insert(obj);
    }



    // Now iterate over the results
    for( DBObject o : coll.find() ) {
      System.out.println( o );
    }
    System.out.println( "Count " + coll.count() );

    // Now delete the documents
    System.out.println("Removing messages...\\n");
    coll.remove( new BasicDBObject() );


    DBObject cmd = new BasicDBObject();
    cmd.put( "count", "messages" );
    System.out.println( "Count " + db.command( cmd ) );
  }
}