java - 将 JsonArray 数据添加到 ArrayList 中

Question

如何添加 jsonArray 数据转化为 ArrayList 产品类型。

我用虚拟 json 数据编写了一个测试类。主要类是 如下:

public class convertData {

        public static void main(String[] args) {

            List<ProductModel> myList = new ArrayList<>();

            JsonArrayBuilder arrayBuilder = Json.createArrayBuilder();
            JsonObject jsonObject1, jsonObject2, jsonObject3;


            jsonObject1 = Json.createObjectBuilder()
                    .add("id", 1)
                    .add("name", "Albany")
                    .add( "manufacture", "Albany Superior Low Gi Sliced Brown Seed Bread 700g")
                    .add("price", 15.49)
                    .add("category", "Food")
                    .add ("type", "Breads")
                    .add( "image", "data:image/jpeg;base64,/9j/4A" )
                    .build();

            jsonObject2 = Json.createObjectBuilder()
                    .add("id", 1)
                    .add("name", "Albany")
                    .add( "manufacture", "yuyyjjgyced Brown Seed Bread 700g")
                    .add("price", 15.49)
                    .add("category", "Food")
                    .add ("type", "Breads")
                    .add( "image", "data:image/jpeg;base64,/9j/4A" )
                    .build();

            jsonObject3 = Json.createObjectBuilder()
                    .add("id", 1)
                    .add("name", "Albany")
                    .add( "manufacture", "Albany Superior Low Gi Sliced Brown Seed Bread 700g")
                    .add("price", 15.49)
                    .add("category", "Food")
                    .add ("type", "Milk")
                    .add( "image", "data:image/jpeg;base64,/9j/4A" )
                    .build();


            arrayBuilder.add(jsonObject1);
            arrayBuilder.add(jsonObject2);
            arrayBuilder.add(jsonObject3);

            JSONArray jArray = (JSONArray) arrayBuilder; 

            if (jArray != null) { 

                for (int i=0;i<jArray.length();i++){ 
                    myList.add(jArray.get(i));
                }
            }

        }
    }

然后我创建了一个产品模型类，如下所示:

class ProductModel {

            private int id;
            private String name;
            private String manufacture;
            private Double price;
            private String category;
            private String type;
            private String image;
            // get and setters
            ...

我搜索过类似的解决方案，但没有帮助 方式。

项目是使用J2SE平台编写的，我只添加了jar json 文件。

我正在构建的 json 数据看起来像这样:

[
    {
        "id": 1,
        "name": "Albany",
        "manufacture": "Albany Superior Low Gi Sliced Brown Seed Bread 700g",
        "price": 15.49,
        "category": "Food",
        "type": "Breads",
        "image": "data:image/jpeg;base64,/9j/4..."
    },
    {
        "id": 2,
        "name": "Blue Ribbon",
        "manufacture": "Blue Ribbon Brown Plus Low Gi Bread 700g",
        "price": 13.99,
        "category": "Food",
        "type": "Breads",
        "image": "data:image/jpeg;base64,/9j/4AAQSkZ."
    },
    {
        "id": 3,
        "name": "Cheese",
        "manufacture": "Galbani Mozzarella Cheese 300g",
        "price": 49.99,
        "category": "Food",
        "type": "Cheese",
        "image": "data:image/octet-stream;base64,/9j/4AAQSkZJRg..."
    }
]

Answer 1

需要做一些改变才能使其运行:

1. 在 ProductModel 类中添加一个构造函数，该构造函数将接受 JsonObject 作为参数:

   public ProductModel(JsonObject json) {
       super();
       this.id = json.getInt("id");
       this.name = json.getString("name");
       this.manufacture = json.getString("manufacture");
       this.price = Double.parseDouble(json.getJsonNumber("price").toString());
       this.category = json.getString("category");
       this.type = json.getString("type");
       this.image = json.getString("image");
   }
   

2. 使用 JsonArray 而不是 JSONArray 并将构建数组传递给它:

   JsonArray jArray = arrayBuilder.build();
   

3. 在add方法中调用新创建的构造函数:

   if (jArray != null) { 
   
            for (int i=0;i<jArray.size();i++){ 
                myList.add(new ProductModel((JsonObject) jArray.get(i)));
            }
        }