Question

我无法从json api获取数据。多次尝试但结果不成功。这是json模式：

{
"All": [{
        "MainCategory": {
            "AllData": [{
                    "SubCategory": {
                        "AllData": [{

                                "MainBigThumb": "rsz_0_800_CHO1.jpg",
                                "MainImage": "rsz_0_400_CHO1.jpg",
                                "MainSmallImages": "rsz_0_100_CHO1.jpg"
                            }, {

                                "MainBigThumb": "rsz_0_800_CHO100.jpg",
                                "MainImage": "rsz_0_400_CHO100.jpg",
                                "MainSmallImages": "rsz_0_100_CHO100.jpg"

                            },
                            {
                                "MainBigThumb": "rsz_0_800_CHO101.jpg",
                                "MainImage": "rsz_0_400_CHO101.jpg",
                                "MainSmallImages": "rsz_0_100_CHO101.jpg"
                            }
                        ],
                        "Attribute_Name": "Chocolate",
                        "Attribute_Value": "123",
                        "StockKeepingunit": null
                    }
                },
                {
                    "SubCategory": {
                        "AllData": [{

                                "MainBigThumb": "rsz_0_800_CRI100.jpg",
                                "MainImage": "rsz_0_400_CRI100.jpg",
                                "MainSmallImages": "rsz_0_100_CRI100.jpg"
                            },
                            {

                                "MainBigThumb": "rsz_0_800_CRI101.jpg",
                                "MainImage": "rsz_0_400_CRI101.jpg",
                                "MainSmallImages": "rsz_0_100_CRI101.jpg"
                            }
                        ],
                        "Attribute_Name": "Crisps",
                        "Attribute_Value": "124",
                        "StockKeepingunit": null
                    }
                }
            ],
            "Attribute_Name": "Confectionery",
            "Attribute_Value": "122",
            "StockKeepingunit": null
        }
    },

    {
        "MainCategory": {
            "AllData": [{
                "SubCategory": {
                    "AllData": [{

                        "MainBigThumb": "rsz_0_800_YP100.jpg",
                        "MainImage": "rsz_0_400_YP100.jpg",
                        "MainSmallImages": "rsz_0_100_YP100.jpg"

                    }],
                    "Attribute_Name": "Sub-Category",
                    "Attribute_Value": "163",
                    "StockKeepingunit": null
                }
            }],
            "Attribute_Name": "Your Category",
            "Attribute_Value": "162",
            "StockKeepingunit": null
        }
    }

],
"status": {
    "message": "success",
    "result": 1
}}

数据格式类似于

1. MainCategory1
       1.1 Subcategory1
           1.1.1 Product1
           1.1.2 Product2

       1.2 Subcategory2
          1.2.1 Product1
          1.2.2 Product2

2. MainCategory2
       2.1 Subcategory1
           2.1.1 Product1
           2.1.2 Product2

Answer 1

您可以使用它进行改造并将整个json数据转换为Gson，这将使它更容易。

首先复制API的响应并通过

创建bean类

this site *点击源类型为JSON *注释样式为GSON *取消使用DoubleNumbers *取消AllowAdition属性

然后将这些文件复制到您的项目

然后在你的活动中

Retrofit retrofit = new Retrofit.Builder()
    .baseUrl(BASE_URL)
    .addConverterFactory(GsonConverterFactory.create())
    .build();
APIServiceInterface apiController = retrofit.create(APIServiceInterface.class);
Call<Bean> result = apiController.studentLogin(username,password);

result.enqueue(new Callback<Bean>() {
@Override
public void onResponse(Call<Bean> call, Response<Bean> response) {
     // you  will get the reponse in the response parameter

}

@Override
public void onFailure(Call<Bean> call, Throwable t) {

}
});

APIServiceInterface是接口文件。

Answer 2

这很简单，但在解析{}时，您必须对[]，,和Json保持谨慎。我不会为你编写解析代码，而只是给出一个想法。

Intitial Json Response Object

Exract JsonArray named as "All" from above object

Get first Position Of above array, you will get an JsonObject

Extract a JsonObject from above object with name "MainCategory" 

Exract JsonArray named as "AllData" from above object

Get first Position Of above array, you will get an JsonObject

Extract a JsonObject from above object with name "SubCategory"

Exract JsonArray named as "AllData"  from above object

Get first Position Of above array, you will get an JsonObject

Containing following data,

                                "MainBigThumb": "rsz_0_800_CHO1.jpg",
                                "MainImage": "rsz_0_400_CHO1.jpg",
                                "MainSmallImages": "rsz_0_100_CHO1.jpg"

Answer 3

我解决了我的问题，这里是json解析如下。

JSONObject jsonObj = new JSONObject(json);
            JSONArray AllJsonArray = jsonObj.getJSONArray("All");
            for (int i = 0; i < AllJsonArray.length(); i++) {

                JSONObject AllJsonObject = AllJsonArray.getJSONObject(i);

                JSONObject mainCategoryJsonObject = AllJsonObject.getJSONObject("MainCategory");
                String mainCategoryName = mainCategoryJsonObject.getString("Attribute_Name");
                String mainCategoryValue= mainCategoryJsonObject.getString("Attribute_Value");
                JSONArray AllData1JsonArray = mainCategoryJsonObject.getJSONArray("AllData");

                for (int j = 0; j < AllData1JsonArray.length(); j++) {
                    JSONObject AllData1JsonObject = AllData1JsonArray.getJSONObject(j);
                    JSONObject subCategoryJsonObject = AllData1JsonObject.getJSONObject("SubCategory");
                    String subCategoryName = subCategoryJsonObject.getString("Attribute_Name");
                    String subCategoryValue = subCategoryJsonObject.getString("Attribute_Value");
                    JSONArray AllData2JsonArray = subCategoryJsonObject.getJSONArray("AllData");

                    for (int k = 0; k < AllData2JsonArray.length(); k++) {
                        JSONObject AllData2JsonObject = AllData2JsonArray.getJSONObject(k);
                         String MainBigThumb = AllData2JsonObject.getString("MainBigThumb");
                        String MainImage = AllData2JsonObject.getString("MainImage");
                        String MainSmallImages = AllData2JsonObject.getString("MainSmallImages");

                        }

                }

            }

如何从三个级别的json API获取数据

3 个答案: