优化

src/main/java/thyyxxk/webserver/utils/DecimalUtil.java

@@ -78,6 +78,9 @@ public class DecimalUtil {
     }
 
     public static BigDecimal divide(BigDecimal a, BigDecimal b, int scale) {
+        if (b.compareTo(BigDecimal.ZERO) == 0) {
+            return BigDecimal.ZERO;
+        }
         return a.divide(b, scale, RoundingMode.HALF_UP);
     }