init

ruoyi-xq/src/main/java/com/ruoyi/xq/util/CaiNumUtil.java

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+package com.ruoyi.xq.util;
+
+import cn.hutool.core.util.NumberUtil;
+
+import java.math.BigDecimal;
+import java.math.RoundingMode;
+
+public class CaiNumUtil {
+
+    /**
+     * 向下取整计算金额
+     * @param value
+     * @param rate
+     * @return
+     */
+    public static BigDecimal coin(BigDecimal value, BigDecimal rate){
+        if(value == null || rate == null){
+            return BigDecimal.ZERO;
+        }
+        BigDecimal decimal = NumberUtil.mul(value, rate);
+        return decimal.setScale(0, RoundingMode.DOWN);
+    }
+
+    public static String rateToStr(BigDecimal rate){
+        BigDecimal mul = NumberUtil.mul(rate, 100);
+        return mul.intValue()+"%";
+    }
+
+    public static BigDecimal memberDay(BigDecimal price, Integer days){
+        BigDecimal div = NumberUtil.div(price, days, 2);
+        if(div.compareTo(BigDecimal.ZERO) == 0){
+            return new BigDecimal("0.01");
+        }
+        return div;
+    }
+
+    public static BigDecimal diffRate(Long onlineTodayNum, Long onlineLastNum) {
+        Long diff = onlineTodayNum - onlineLastNum;
+        if(onlineLastNum == 0){
+            return BigDecimal.ZERO;
+        }
+        return NumberUtil.div(diff,onlineLastNum,3);
+    }
+
+    public static BigDecimal diffRate(BigDecimal onlineTodayNum, BigDecimal onlineLastNum) {
+        BigDecimal diff = NumberUtil.sub(onlineTodayNum, onlineLastNum);
+        if(onlineLastNum.compareTo(BigDecimal.ZERO) == 0){
+            return BigDecimal.ZERO;
+        }
+        return NumberUtil.div(diff,onlineLastNum,3);
+    }
+
+}