code: public BitZTradeAddResult addEntrustSheet(
        String symbol, String type, BigDecimal price, BigDecimal number) throws IOException {
      return bitz.addEntrustSheet(
          apiKey, symbol, getTimeStamp(), nonce, signer, type, price, number, tradePwd);
    }
docs: 提交委托单(下订单)
  
  @param symbol
  @param type 购买类型 1买进 2 卖出
  @param price
  @param number
  @return
  @throws IOException