mongodb获取collection中的数据

以前没有用过这个，作为记录，参考帖子https://www.cnblogs.com/luoaz/p/4691639.html

DBCollection collection = configMongoTempleate.getCollection("集合名称");
BasicDBObject eq = new BasicDBObject("$eq",inMailId);//$eq 表示等于
BasicDBObject queryObject = new BasicDBObject("im_mail_id",eq);//字段名称
DBCursor cursor = collection.find(queryObject);
while(cursor.hasNext()){
   DBObject obj = cursor.next();
   System.out.println(obj.toString());
}