电商订单的操作

1 结算页面不进行任何业务层处理，购物车数据转订单详情

2 结算页面提交订单时，只能提交一次(防止表单重复提交)

防止表单重复提交具体步骤:

点击购物车结算按钮时→ 后台生成TradeCode交易码分别放在订单页面和redis缓存各一份

点击提交订单时→会将订单页面的交易码跟缓存里面的进行比对,如果为true,则重定向到支付页面,并删除redis缓存里的TradeCode交易码,如果用户回退,因为redis缓存的交易码已经用过并删除了,所以比对失败,跳到失败页面,达到防止表单重复提交的效果

---

代码如下:

 点击购物车结算跳到订单页面

@LoginRequired
@RequestMapping("toTrade")
public String toTrade(HttpServletRequest request, ModelMap map){

    String memberId = (String)request.getAttribute("memberId");
    String nickname = (String)request.getAttribute("nickname");

    // 查询购物车数据
    List<OmsCartItem> omsCartItems = cartService.getCartList(memberId);

    // 转化成订单数据
    List<OmsOrderItem> omsOrderItems = new ArrayList<>();
    for (OmsCartItem omsCartItem : omsCartItems) {
        OmsOrderItem omsOrderItem = new OmsOrderItem();
        Date date = new Date();
        SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMddHHmmss");
        String orderSn = "gmall"+sdf.format(date)+System.currentTimeMillis();
        omsOrderItem.setOrderSn(orderSn);
        omsOrderItem.setProductCategoryId(omsCartItem.getProductCategoryId());
        omsOrderItem.setProductId(omsCartItem.getProductId());
        ......
        omsOrderItems.add(omsOrderItem);
    }
    map.put("orderDetailList",omsOrderItems);
    List<UmsMemberReceiveAddress> umsMemberReceiveAddresses = userService.getAddressListByMemberId(memberId);
    map.put("userAddressList",umsMemberReceiveAddresses);
    // 防止表单重复提交
    String tradeCode = orderService.genTradeCode(memberId);
    map.put("tradeCode",tradeCode);
    return "trade";
}

---

查询购物车数据

@Override

public List<OmsCartItem> getCartList(String memberId) {
    List<OmsCartItem> cartItems = new ArrayList<>();
    Jedis jedis = redisUtil.getJedis();
    List<String> hvals = jedis.hvals("user:" + memberId + ":cart");
    if(hvals!=null&&hvals.size()>0){
        for (String hval : hvals) {
            OmsCartItem omsCartItem = JSON.parseObject(hval,OmsCartItem.class);
            cartItems.add(omsCartItem);
        }
    }
    jedis.close();
    return cartItems;
}

---

查询用户地址
@Override
public List<UmsMemberReceiveAddress> getAddressListByMemberId(String memberId) {
    UmsMemberReceiveAddress umsMemberReceiveAddress = new UmsMemberReceiveAddress();
    umsMemberReceiveAddress.setMemberId(memberId);
    List<UmsMemberReceiveAddress> umsMemberReceiveAddresses = umsMemberReceiveAddressMapper.select(umsMemberReceiveAddress);

    return umsMemberReceiveAddresses;
}

---

获取交易码

@Override
public String genTradeCode(String memberId) {
    Jedis jedis = null;
    jedis = redisUtil.getJedis();
    String tradeCode = UUID.randomUUID().toString();
    jedis.setex("user:" + memberId + ":tradeCode", 60 * 15,tradeCode );
    jedis.close();
    return tradeCode;
}

---

---

@LoginRequired
@RequestMapping("submitOrder")
public String submitOrder(HttpServletRequest request, ModelMap map, String deliveryAddressId, String tradeCode){
    // 获取用户信息
    String memberId = (String)request.getAttribute("memberId");
    String nickname = (String)request.getAttribute("nickname");
　　//比对订单页面的交易码和redis缓存里面的交易码是否一样
    boolean b = orderService.checkTradeCode(tradeCode,memberId);

    if(b){

        // 用户收获信息
        UmsMemberReceiveAddress umsMemberReceiveAddress =  userService.getAddressById(deliveryAddressId);

        // 根据用户获取购物车数据
        List<OmsCartItem> cartList = cartService.getCartList(memberId);
        // 根据购物车数据生成订单数据
        OmsOrder omsOrder = new OmsOrder();
        Date date = new Date();
        SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMddHHmmss");
        String orderSn = "gmall"+sdf.format(date)+System.currentTimeMillis();
        omsOrder.setOrderSn(orderSn);
        omsOrder.setPayAmount(getTotalAmount(cartList));
        omsOrder.setStatus("0");
        omsOrder.setCreateTime(new Date());
　　　　　......
        List<OmsOrderItem> omsOrderItems = new ArrayList<OmsOrderItem>();
        List<String> cartIds = new ArrayList<>();
        for (OmsCartItem omsCartItem : cartList) {
            OmsOrderItem omsOrderItem = new OmsOrderItem();
            omsOrderItem.setProductSkuCode(omsCartItem.getProductSkuCode());
            omsOrderItem.setProductPrice(omsCartItem.getPrice());
            omsOrderItem.setOrderSn(orderSn);
　　　　　　　......
            omsOrderItems.add(omsOrderItem);
            cartIds.add(omsCartItem.getId());
        }
        omsOrder.setOmsOrderItems(omsOrderItems);

        // 将订单数据保存到数据库
        orderService.addOrder(omsOrder);

        // 删除购物车数据
        // cartService.delCarts(cartIds);

        System.out.println("获取用户信息");
        System.out.println("根据用户获取购物车数据");
        System.out.println("根据购物车数据生成订单数据");
        System.out.println("将订单数据保存到数据库");
        System.out.println("删除购物车数据");
        System.out.println("重定向到支付页面");
    }else{
        return "tradeFail";
    }

    return "pay";// 重定向到支付页面
}

---

比对订单页面的交易码和redis缓存里面的交易码是否一样

@Override
    public boolean checkTradeCode(String tradeCode,String memberId) {
        boolean b = false;

        Jedis jedis = null;
        jedis = redisUtil.getJedis();
//        String tradeCodeFromCache = jedis.get("user:" + memberId + ":tradeCode");
//        if(StringUtils.isNotBlank(tradeCodeFromCache)&&tradeCodeFromCache.equals(tradeCode)){
//            b = true;
//            jedis.del("user:" + memberId + ":tradeCode");
//        }
　　　　　//并发问题推荐用这种
        String script = "if redis.call('get', KEYS[1]) == ARGV[1] then return redis.call('del', KEYS[1]) else return 0 end";
        Long eval = (Long) jedis.eval(script, Collections.singletonList("user:" + memberId + ":tradeCode"),
                Collections.singletonList(tradeCode));
        if(new BigDecimal(eval).compareTo(new BigDecimal("0"))!=0){
            b = true;
        }
        jedis.close();
        return b;
    }

---

用户地址信息
 @Override
    public UmsMemberReceiveAddress getAddressById(String deliveryAddress) {

        UmsMemberReceiveAddress umsMemberReceiveAddress = new UmsMemberReceiveAddress();
        umsMemberReceiveAddress.setId(deliveryAddress);
        UmsMemberReceiveAddress umsMemberReceiveAddress1 = umsMemberReceiveAddressMapper.selectOne(umsMemberReceiveAddress);
        return umsMemberReceiveAddress1;
    }
}

---

将订单信息保存到数据库

@Override
public void addOrder(OmsOrder omsOrder) {
    omsOrderMapper.insertSelective(omsOrder);
    String orderId = omsOrder.getId();
    List<OmsOrderItem> omsOrderItems = omsOrder.getOmsOrderItems();
    for (OmsOrderItem omsOrderItem : omsOrderItems) {
        omsOrderItem.setOrderId(orderId);
        omsOrderItemMapper.insertSelective(omsOrderItem);
    }
}

以上就完成啦!