股票行情 app，是不是要用 socket？

小白一个。我想搞一个实时的行情 app 练练手，找到了一些可以用的免费 api 来取数据。（聚合，新浪，雅虎什么的）真要写的时候遇到一个问题，我发一次请求只能从他们那里得到一个时间点的数据，比如发送

http://web.juhe.cn:8080/finance/stock/hs?gid=sh601009&key=APPKEY ，

它只能返回 { "resultcode":"200", /返回码， 200:正常/ "reason":"SUCCESSED!", "result":[ { "data":{ "gid":"sh601009", /股票编号/ "increPer": "9.91", /涨跌百分比/ "increase": "43.99", /涨跌额/ "name":"南京银行", /股票名称/ "todayStartPri":"8.26", /今日开盘价/ "yestodEndPri":"8.26", /昨日收盘价/ "nowPri":"8.37", /当前价格/ "todayMax":"8.55", /今日最高价/ "todayMin":"8.25", /今日最低价/ "competitivePri":"8.37", /竞买价/ "reservePri":"8.38", /竞卖价/ "traNumber":"34501453", /成交量/ "traAmount":"290889560", /成交金额/ "buyOne":"10870", /买一/ "buyOnePri":"8.37", /买一报价/ "buyTwo":"177241", /买二/ "buyTwoPri":"8.36", /买二报价/ "buyThree":"92600", /买三/ "buyThreePri":"8.35", /买三报价/ "buyFour":"87200" /买四/ "buyFourPri":"8.34", /买四报价/ "buyFive":"113700", /买五/ "buyFivePri":"8.42", /买五报价/ "sellOne":"47556", /卖一/ "sellOnePri":"8.38", /卖一报价/ "sellTwo":"103057", /卖二/ "sellTwoPri":"8.39", /卖二报价/ "sellThree":"186689", /卖三/ "sellThreePri":"8.40", /卖三报价/ "sellFour":"49000", /卖四/ "sellFourPri":"8.41", /卖四报价/ "sellFive":"214535", /卖五/ "sellFivePri":"15.21", /卖五报价/ "date":"2012-12-11", /日期/ "time":"15:03:06", /时间/ }, "dapandata":{/大盘数据可通过字段 type 单独查询/ }, "gopicture":{

"minurl":"http://image.sinajs.cn/newchart/min/n/sh601009.gif",/*分时 K 线图*/
    "dayurl":"http://image.sinajs.cn/newchart/daily/n/sh601009.gif",/*日 K 线图*/
    "weekurl":"http://image.sinajs.cn/newchart/weekly/n/sh601009.gif",/*周 K 线图*/
    "monthurl":"http://image.sinajs.cn/newchart/monthly/n/sh601009.gif"/*月 K 线图*/
}

}] } ----------------------------------深（上）证指数示例------------------------------------------------------------------ { "error_code": 0 "reason": "SUCCESSED!", "result": { "dealNum": "24388041799",/成交量/ "dealPri": "340674441059.270",/成交额/ "highPri": "10357.417",/最高/ "increPer": "-0.46",/涨跌百分比/ "increase": "-43.756",/涨跌幅/ "lowpri": "10121.741",/最低/ "name": "深证成指",/名称/ "nowpri": "10270.855",/当前价格/ "openPri": "10200.547",/今开/ "time": "2015-09-22 14:45:25",/时间/ "yesPri": "10176.727"/昨收/ }, }

只有“"time":"15:03:06",/时间/”和“"nowPri":"8.37"/当前价格/”，那如果我想得到下一秒的价格，岂不是还要再发一次请求？

即便 api 免费调用，这也太麻烦了吧？有没有什么其他的办法？多谢各位。。。