[电表统计][修改][chart55提示错误]

mallinkService/src/main/java/com/iformall/service/impl/WxChartServiceImpl.java

@@ -415,13 +415,16 @@ public class WxChartServiceImpl implements WxChartDataService {
         }
 
         if (lastMonthPower.getUsedPower() !=null && currentPower.getUsedPower() != null) {
-            double hbd = (double) (currentPower.getUsedPower() - lastMonthPower.getUsedPower()) / lastMonthPower.getUsedPower() * 100;
-            double hb = new BigDecimal(hbd).setScale(2, BigDecimal.ROUND_HALF_UP).doubleValue();
-            resultMap.put("usedPowerRate", hb + "%");
+            if(lastMonthPower.getUsedPower().equals(0)){
+                resultMap.put("usedPowerRate", "0%");
+            }else{
+                double hbd = (double) (currentPower.getUsedPower() - lastMonthPower.getUsedPower()) / lastMonthPower.getUsedPower() * 100;
+                double hb = new BigDecimal(hbd).setScale(2, BigDecimal.ROUND_HALF_UP).doubleValue();
+                resultMap.put("usedPowerRate", hb + "%");
+            }
         } else {
             resultMap.put("usedPowerRate", "--" + "%");
         }
-
         KwMeter kwMeter = new KwMeter();
         kwMeter.setTenantId(tenantId);
         kwMeter.setStatus(EnumMeterStatus.VALID.getCode());