fastjson>json运用

前端传递数组给后端，

首先创建数组对象，

java">        var cartItemId = new Array();

将数据存入数组中后，使用stringify将数组字符串化，

javascript>javascript">        cartItemId = JSON.stringify(cartItemId);

用$.ajax()方法传给后端进行处理

javascript>javascript">        $.ajax({
            type: "POST",
            url: "viewOrderForm",
            data: {
                    "orderItemId": cartItemId,
                    "orderItemQuantity": cartItemQuantity,
                    "totalMoney":singleProductTotal
            },
            dataType: 'text',
            success:function (data) {
                console.log("服务器接收改变数量为" + cartItemId + cartItemQuantity + singleProductTotal)
                console.log(data);
                window.location.replace(data);
            }
        })
    })

后端获取数据进行处理

java">        //获取字符串
        String itemString = request.getParameter("orderItemId");
        String quantityString = request.getParameter("orderItemQuantity");
        String moneyString = request.getParameter("totalMoney");

将字符串转化成JSONArray

java">        //转换成JSONARRAY
        JSONArray itemArray = JSON.parseArray(itemString);

用get方法获得数组中每个元素并进行后续操作

java">            System.out.println(itemArray.get(i).toString());

前端代码总：

javascript>javascript">//提交按钮
    var $submitorder = $("#submitOrder");
    $submitorder.on("click", function () {
        //提交购物车数据给服务器
        //产品item信息
        var cartItemId = new Array();
        //产品数量信息
        var cartItemQuantity = new Array();
        //产品单品总价array
        var singleProductTotal = new Array();

        //获取所有的产品的item
        var currentItem = document.getElementsByClassName("itemId");
        //所有的总价
        var allTotalPrice = document.getElementsByClassName("totalPrice");
        for(var i = 0 ; i < allTotalPrice.length ; i++){
            var innerPrice = allTotalPrice[i].innerHTML;
            console.log("单品总价" + i + "="+ innerPrice)
            innerPrice = innerPrice.trim();
            innerPrice = innerPrice.substring(1);
            singleProductTotal[i] = innerPrice;

        }

        for (var i = 0; i < currentItem.length; i++) {
            //获取产品的itemId
            var currentItemId = currentItem[i].innerHTML;
            currentItemId = currentItemId.trim();
            console.log(currentItemId);
            cartItemId[i] = currentItemId;
            //获得产品数量
            var currentQuantity = quantityInput[i];
            currentQuantity = currentQuantity.value;
            currentQuantity = parseInt(currentQuantity);
            console.log(currentQuantity);
            cartItemQuantity[i] = currentQuantity;
        }

        //字符串化
        cartItemId = JSON.stringify(cartItemId);
        cartItemQuantity = JSON.stringify(cartItemQuantity);
        singleProductTotal = JSON.stringify(singleProductTotal);

        $.ajax({
            type: "POST",
            url: "viewOrderForm",
            data: {
                    "orderItemId": cartItemId,
                    "orderItemQuantity": cartItemQuantity,
                    "totalMoney":singleProductTotal
            },
            dataType: 'text',
            success:function (data) {
                console.log("服务器接收改变数量为" + cartItemId + cartItemQuantity + singleProductTotal)
                console.log(data);
                window.location.replace(data);
            }
        })
    })

后端代码总：

java">        Cart cart = new Cart();

        //获取字符串
        String itemString = request.getParameter("orderItemId");
        String quantityString = request.getParameter("orderItemQuantity");
        String moneyString = request.getParameter("totalMoney");

        //转换成JSONARRAY
        JSONArray itemArray = JSON.parseArray(itemString);
        System.out.println(itemArray);
        JSONArray quantityArray = JSON.parseArray(quantityString);
        System.out.println(quantityArray);
        JSONArray moneyArray = JSON.parseArray(moneyString);
        for(int i = 0; i < itemArray.size(); i++) { //循环打印出数组
            System.out.println(itemArray.get(i).toString()+quantityArray.get(i) .toString()+moneyArray.get(i).toString());
//            System.out.println(quantityArray.get(i));
        }
        //赋值给cart
        for(int i = 0 ; i < itemArray.size() ; i++){
            Item item = catalogService.getItem(itemArray.get(i).toString());
            int quantity = Integer.parseInt(quantityArray.get(i).toString());
            BigDecimal total = new BigDecimal(moneyArray.get(i).toString());
            cart.addItem(new CartItem(item,quantity,total));
        }