/// <summary>
/// 现货历史交易信息
/// </summary>
/// <param name="symbol">btc_usd:比特币 ltc_usd :莱特币</param>
/// <param name="since">不加since参数时，返回最近的60笔交易</param>
/// <returns></returns>
public String trades(String symbol, String since)
{
String result = "";
try
{
HttpUtilManager httpUtil = HttpUtilManager.getInstance();
String param = "";
if (!StringUtil.isEmpty(symbol))
{
if (!param.Equals(""))
{
param += "&";
}
param += "symbol=" + symbol;
}
if (!StringUtil.isEmpty(since))
{
if (!param.Equals(""))
{
param += "&";
}
param += "since=" + since;
}
result = httpUtil.requestHttpGet(url_prex, TRADES_URL, param);
}
catch (Exception e)
{
throw e;
}
return(result);
}
