238、商城业务-购物车-VO编写

最新推荐文章于 2024-08-22 12:29:03 发布

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本文详细解析了购物车结算逻辑的实现，包括商品数量、类型数量、总价计算及优惠减免等核心功能。通过具体代码示例，展示了如何动态计算购物车的各项关键指标。

/**
 * 整个购物车
 * 需要计算的属性，必须重写他的get方法，保证每次获取属性都会进行计算
 */
public class Cart {

    List<CartItem> items;

    private Integer countNum;//商品数量

    private Integer countType;//商品类型数量

    private BigDecimal totalAmount;//商品总价

    private BigDecimal reduce = new BigDecimal("0.00");//减免价格

    public List<CartItem> getItems() {
        return items;
    }

    public void setItems(List<CartItem> items) {
        this.items = items;
    }

    public Integer getCountNum() {
        int count = 0;
        if(items != null && items.size() > 0){
            for(CartItem item : items){
                count += item.getCount();
            }
        }
        return count;
    }


    public Integer getCountType() {
        int count = 0;
        if(items != null && items.size() > 0){
            for(CartItem item : items){
                count += 1;
            }
        }
        return count;
    }


    public BigDecimal getTotalAmount() {
        BigDecimal amount = new BigDecimal("0");
        // 1、计算购物项总价
        if(items != null && items.size() > 0){
            for(CartItem item : items){
                BigDecimal totalPrice = item.getTotalPrice();
                amount = amount.add(totalPrice);
            }
        }
        //2、减去优惠总价
        BigDecimal subtract = amount.subtract(getReduce());
        return subtract;
    }


    public BigDecimal getReduce() {
        return reduce;
    }

    public void setReduce(BigDecimal reduce) {
        this.reduce = reduce;
    }
}

/**
 * 购物项内容
 */
public class CartItem {

    private Long skuId;
    private Boolean check = true;
    private String title;
    private String image;
    private List<String> skuAttr;
    private BigDecimal price;
    private Integer count;
    private BigDecimal totalPrice;

    public Long getSkuId() {
        return skuId;
    }

    public void setSkuId(Long skuId) {
        this.skuId = skuId;
    }

    public Boolean getCheck() {
        return check;
    }

    public void setCheck(Boolean check) {
        this.check = check;
    }

    public String getTitle() {
        return title;
    }

    public void setTitle(String title) {
        this.title = title;
    }

    public String getImage() {
        return image;
    }

    public void setImage(String image) {
        this.image = image;
    }

    public List<String> getSkuAttr() {
        return skuAttr;
    }

    public void setSkuAttr(List<String> skuAttr) {
        this.skuAttr = skuAttr;
    }

    public BigDecimal getPrice() {
        return price;
    }

    public void setPrice(BigDecimal price) {
        this.price = price;
    }

    public Integer getCount() {
        return count;
    }

    public void setCount(Integer count) {
        this.count = count;
    }

    /**
     * 计算当前项的总价
     * @return
     */
    public BigDecimal getTotalPrice() {

        return this.price.multiply(new BigDecimal("" + this.count));
    }

    public void setTotalPrice(BigDecimal totalPrice) {
        this.totalPrice = totalPrice;
    }
}