[alibaba/fastjson]对Map 的序列化的时候的JSON格式错误

我在使用fastJSON 序列化一个 带有 Map<Integer,Order>类型的属性的对象的 的时候 发现正确序列化的json 字符串 格式错误

fastJSON 版本: 1.2.54

格式错误如下： 很明显看到红色部分 fastjson 将数字作为了 json的键 而没有加上双引号 导致前端解析json错误

{
    "Status": "购物车不为空",
    "data": {
        2: {
            "count": 2,
            "product": {
                "integral": 5,
                "monthlySale": 155,
                "picture01": "./Product/JavaThink01.jpg",
                "picture2": "./Product/JavaThing02.jpg",
                "picture3": "./Product/JavaThing03\t.jpg",
                "picture4": "./Product/JavaThing04.jpg",
                "picture5": "./Product/JavaThing05.jpg",
                "price": 86.4,
                "productID": 2,
                "productName": "Java编程思想第4版/第四版/thinking in java中文版/java基础入门书",
                "review": 4171,
                "saveCount": 45,
                "typeID": 1
            }
        },
        6: {
            "count": 2,
            "product": {
                "integral": 10,
                "monthlySale": 67,
                "picture01": "./Product/go01.jpg",
                "picture2": "./Product/go02.jpg",
                "picture3": "./Product/go03.jpg",
                "picture4": "./Product/go04.jpg",
                "picture5": "./Product/go05.jpg",
                "price": 56.8,
                "productID": 6,
                "productName": "Go语言核心编程 Go语言编程入门教程书籍 golang教程实战",
                "review": 206,
                "saveCount": 120,
                "typeID": 1
            }
        }
    },
    "HasProduct": true,
    "meonyAll": 286.4,
    "Count": 4
}

        JSONObject obj = new JSONObject();
        if(request.getSession().getAttribute("Cars") == null){
            //购物车没有物品 为空
            obj.put("HasProduct",false);
            obj.put("Status","购物车为空");
        }else{
            Map<Integer,Order> shoppingCar =(Map<Integer,Order>)request.getSession().getAttribute("Cars");
            if(shoppingCar.keySet().isEmpty()){
                obj.put("Status","购物车为空");
                obj.put("HasProduct",false);
            }else{
                request.getSession().setMaxInactiveInterval(60*60);

                obj.put("Status","购物车不为空");
                obj.put("HasProduct",true);
                obj.put("data",shoppingCar);

                int count = 0;
                float meonyAll = 0.0f;
                //商品件数
                for (Integer val :shoppingCar.keySet()) {
                    Order order = (Order)shoppingCar.get(val);
                    count += order.getCount();
                    meonyAll += (order.getCount() * order.getProduct().getPrice());
                }
                obj.put("Count",count);
                obj.put("meonyAll",meonyAll);
            }
        }

public class Order {
    private Product product;

    public Product getProduct() {
        return product;
    }

    public void setProduct(Product product) {
        this.product = product;
    }

    public Order() {
    }

    public Order(Product product, int count) {
        this.product = product;
        Count = count;
    }

    public int getCount() {
        return Count;
    }

    public void setCount(int count) {
        Count = count;
    }

    private int Count;
}

public class Product {
    public int productID;
    public int typeID;
    public String productName;
    public float price;
    public int monthlySale;
    public int review;
    public int saveCount;
    public int integral;
    public String picture01;
    public String picture2;
    public String picture3;
    public String picture4;
    public String picture5;

    public Product(int productID, int typeID, String productName, float price, int monthlySale, int review, int saveCount, int integral, String picture01, String picture2, String picture3, String picture4, String picture5) {
        this.productID = productID;
        this.typeID = typeID;
        this.productName = productName;
        this.price = price;
        this.monthlySale = monthlySale;
        this.review = review;
        this.saveCount = saveCount;
        this.integral = integral;
        this.picture01 = picture01;
        this.picture2 = picture2;
        this.picture3 = picture3;
        this.picture4 = picture4;
        this.picture5 = picture5;
    }

    public Product(){

    }

    public int getProductID() {
        return productID;
    }

    public void setProductID(int productID) {
        this.productID = productID;
    }

    public int getTypeID() {
        return typeID;
    }

    public void setTypeID(int typeID) {
        this.typeID = typeID;
    }

    public String getProductName() {
        return productName;
    }

    public void setProductName(String productName) {
        this.productName = productName;
    }

    public float getPrice() {
        return price;
    }

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

    public int getMonthlySale() {
        return monthlySale;
    }

    public void setMonthlySale(int monthlySale) {
        this.monthlySale = monthlySale;
    }

    public int getReview() {
        return review;
    }

    public void setReview(int review) {
        this.review = review;
    }

    public int getSaveCount() {
        return saveCount;
    }

    public void setSaveCount(int saveCount) {
        this.saveCount = saveCount;
    }

    public int getIntegral() {
        return integral;
    }

    public void setIntegral(int integral) {
        this.integral = integral;
    }

    public String getPicture01() {
        return picture01;
    }

    public void setPicture01(String picture01) {
        this.picture01 = picture01;
    }

    public String getPicture2() {
        return picture2;
    }

    public void setPicture2(String picture2) {
        this.picture2 = picture2;
    }

    public String getPicture3() {
        return picture3;
    }

    public void setPicture3(String picture3) {
        this.picture3 = picture3;
    }

    public String getPicture4() {
        return picture4;
    }

    public void setPicture4(String picture4) {
        this.picture4 = picture4;
    }

    public String getPicture5() {
        return picture5;
    }

    public void setPicture5(String picture5) {
        this.picture5 = picture5;
    }
}