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Date lastExcTime=new Date();
CommandResult result = mongoTemplate.getDb().command(
new BasicDBObject("distinct", "homeLog").append("key",
"userId").append(
"query",
new BasicDBObject("createTime", new BasicDBObject(
"$gte", lastExcTime))));
JSONArray bean=JSONArray.parseArray(result.getString("values"));
System.out.println(bean.size());