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

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@Overridepublic 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

@Overridepublic 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

@Overridepublic 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!

原文地址：https://www.cnblogs.com/liuyi13535496566/p/11629806.html