购物车禁止添加重复商品

src/custom/restcontroller/sale/shoppingcart/ShoppingCart.java

@@ -38,8 +38,8 @@ public class ShoppingCart extends Controller {
         Long sa_brandid = content.getLongValue("sa_brandid");
         Long itemid = content.getLong("itemid");
         BigDecimal qty = content.getBigDecimal("qty");
-        BigDecimal length = content.getBigDecimal("length");
-        BigDecimal width = content.getBigDecimal("width");
+        BigDecimal length = content.getBigDecimalValue("length");
+        BigDecimal width = content.getBigDecimalValue("width");
         String cheek = content.getStringValue("cheek");
         String colors = content.getStringValue("colors");
         String material = content.getStringValue("material");