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

@@ -0,0 +1,32 @@
+package com.ruoyi.cai.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 Long coin(Long value, BigDecimal rate){
+        if(value == null || rate == null){
+            return 0L;
+        }
+        BigDecimal decimal = NumberUtil.mul(value, rate);
+        return decimal.setScale(0, RoundingMode.DOWN).longValue();
+    }
+
+    public static String rateToStr(BigDecimal rate){
+        BigDecimal mul = NumberUtil.mul(rate, 100);
+        return mul.intValue()+"%";
+    }
+
+    public static void main(String[] args) {
+        System.out.println(rateToStr(BigDecimal.valueOf(0.07)));
+    }
+}