//创建MongoClient对象

                MongoClient mc=new MongoClient("127.0.0.1");

        //获得test库

        DB db = mc.getDB("test");

                //获得user集合

        DBCollection collection = db.getCollection("user");

        //查询

        DBCursor find = collection.find();

                //输出数据

        while(find.hasNext()){

            DBObject txt = find.next();

            Double object =(Double)txt.get("uid");

            System.out.println(object);

            String str=(String)txt.get("uname");

            System.out.println(str);

        }

        mc.close();