修复：#320 支付手续费计算不正确，超过付款金额 #334

yudao-module-pay/yudao-module-pay-biz/src/main/java/cn/iocoder/yudao/module/pay/service/order/PayOrderServiceImpl.java

@@ -39,7 +39,6 @@ import org.springframework.transaction.annotation.Transactional;
 import org.springframework.validation.annotation.Validated;
 
 import javax.annotation.Resource;
-import java.math.RoundingMode;
 import java.time.LocalDateTime;
 import java.util.List;
 import java.util.Objects;
@@ -347,7 +346,7 @@ public class PayOrderServiceImpl implements PayOrderService {
                         .successTime(notify.getSuccessTime()).extensionId(orderExtension.getId()).no(orderExtension.getNo())
                         .channelOrderNo(notify.getChannelOrderNo()).channelUserId(notify.getChannelUserId())
                         .channelFeeRate(channel.getFeeRate())
-		                .channelFeePrice(MoneyUtils.calculateRatePrice(order.getPrice(), channel.getFeeRate(), 0, RoundingMode.HALF_UP).intValue())
+		                .channelFeePrice(MoneyUtils.calculateRatePrice(order.getPrice(), channel.getFeeRate()))
                         .build());
         if (updateCounts == 0) { // 校验状态，必须是待支付
             throw exception(ORDER_STATUS_IS_NOT_WAITING);

yudao-module-pay/yudao-module-pay-biz/src/main/java/cn/iocoder/yudao/module/pay/util/MoneyUtils.java

@@ -1,16 +1,28 @@
 package cn.iocoder.yudao.module.pay.util;
 
+import cn.hutool.core.util.NumberUtil;
+
 import java.math.BigDecimal;
 import java.math.RoundingMode;
 
-import cn.hutool.core.util.NumberUtil;
-
 /**
  * 金额工具类
  *
  * @author 芋道源码
  */
 public class MoneyUtils {
+
+    /**
+     * 计算百分比金额，四舍五入
+     *
+     * @param price 金额
+     * @param rate 百分比，例如说 56.77% 则传入 56.77
+     * @return 百分比金额
+     */
+    public static Integer calculateRatePrice(Integer price, Double rate) {
+        return calculateRatePrice(price, rate, 0, RoundingMode.HALF_UP).intValue();
+    }
+
 	/**
 	 * 计算百分比金额
 	 *
@@ -21,7 +33,7 @@ public class MoneyUtils {
 	 */
 	public static BigDecimal calculateRatePrice(Number price, Number rate, int scale, RoundingMode roundingMode) {
 		return NumberUtil.toBigDecimal(price).multiply(NumberUtil.toBigDecimal(rate)) // 乘以
-				.divide(BigDecimal.valueOf(100), scale, roundingMode); // 除以100
+				.divide(BigDecimal.valueOf(100), scale, roundingMode); // 除以 100
 	}
 
 }