import com.mongodb.Mongo;
import com.mongodb.DB;
import com.mongodb.DBCollection;
import com.mongodb.BasicDBObject;
import com.mongodb.DBObject;
import com.mongodb.DBCursor;
Mongo m = new Mongo();
// or
Mongo m = new Mongo( "localhost" );
// or
Mongo m = new Mongo( "localhost" , 27017 );
DB db = m.getDB( "mydb" );
//设置用户名密码连接:有就返回true,否则返回false。
boolean auth = db.authenticate(myUserName, myPassword);