防止电费大于总金额，服务费出现负数

xhpc-modules/xhpc-order/src/main/java/com/xhpc/order/api/XhpcPileOrderController.java

@@ -308,8 +308,14 @@ public class XhpcPileOrderController extends BaseController {
                 powerPrice=powerPrice.add(multiply);
             }
             powerPrice =powerPrice.setScale(2,BigDecimal.ROUND_HALF_UP);
+
             //总服务费
             BigDecimal servicePrice = money.subtract(powerPrice);
+            //防止出现负数
+            if(powerPrice.compareTo(money)>0){
+                powerPrice =money;
+                servicePrice = money.subtract(powerPrice);
+            }
             //剩余的电费
             BigDecimal surplusPowerPrice = powerPrice;
             //剩余的服务费