[add] 绿波交通比例计算优化

signal-optimize-service/src/main/java/net/wanji/opt/service/impl/TrendServiceImpl.java

@@ -2021,8 +2021,8 @@ public class TrendServiceImpl implements TrendService {
 
     private int getRate(int count, int size) {
         float temp = count / (float) size * 100;
-        temp = temp <= 1 ? 1 : temp;
-        int rate = Math.round(temp);
+        BigDecimal bigDecimal = new BigDecimal(temp);
+        int rate = bigDecimal.setScale(0, RoundingMode.HALF_UP).intValue();
         return rate;
     }