用Java決議JSON多維陣列

我是 Java 編碼的新手，我想決議 json 回應，它看起來像這樣：

{
    "13.12.2021  Monday": {
        "lessons": [
            {
            "type": "second",
            "lesson":{
                "subject": "ОР и АБД",
                "teacher": "Кузьмина В.М.",
                "room": null
                }
            },
            {
                "type": "common",
                "0": {
                    "subject": "ПМ.2.Р5. РС и ПИР со С и ДК",
                    "teacher": "Голубева Я.С.",
                    "room": "211"
                }
            }
        ],
        "dinner": "11.00 "
        },
    "14.12.2021  Tuesday": {
        "lessons":[
            {
                "type": "common",
                "0":{
                    "subject": "ПМ.2.Р1. ТРОПО",
                    "teacher": "Ахметова Ф.Т.","room":"212"
                }
            },
            {
                "type": "common",
                "0":{
                    "subject": "ПМ.2.Р1. ТРОПО",
                    "teacher": "Ахметова Ф.Т.",
                    "room": "212"
                }
            }
        ],
        "dinner": "11:00 "
    }
}

我用這個代碼

JSONObject json = new JSONObject(result);
Iterator<String> days = json.keys();

String response = "";

while(days.hasNext()) {
    String key = days.next();
    JSONObject day = json.getJSONObject(key);
    JSONArray lessons = day.getJSONArray("lessons");

    int lessonsCount = lessons.length(), i;
    for (i = 0; i < lessonsCount; i = i   1) {
        JSONObject lesson = lessons.getJSONObject(i);
        response  = lesson.getString("type")   '\n';
    }


    response  = '\n';
}

但是得到這個錯誤：

org.json.JSONException：無法將 org.json.JSONArray 型別的 4 處的值 [] 轉換為 JSONObject

請解釋我如何訪問所有子元素，例如“課程”塊及其“主題”、“老師”、“房間”。我檢查過類似的問題，但沒有一個對我有幫助

uj5u.com熱心網友回復：

例如：

  StringBuilder response = new StringBuilder();
        while (days.hasNext()) {
            String key = days.next();
            JSONObject day = json.getJSONObject(key);
            JSONArray lessons = day.getJSONArray("lessons");
            for (int i = 0; i < lessons.length(); i  ) {
                JSONObject lesson = lessons.getJSONObject(i);
                Iterator<String> item = lesson.keys();
                while (item.hasNext()) {
                    String jKey = item.next();
                    JSONObject jsonObject = lesson.optJSONObject(jKey);
                    if (jsonObject != null) {
                        parse(response, jsonObject);
                    } else {
                        if (lesson.get(jKey) != null) {
                            response.append(lesson.getString(jKey)).append("\n");
                        }
                    }
                }
            }
            response.append('\n');
        }


private void parse(StringBuilder response, JSONObject jsonObject) {
        if (jsonObject != null) {
            Iterator<String> item = jsonObject.keys();
            while (item.hasNext()) {
                String jKey = item.next();
                JSONObject jObject = jsonObject.optJSONObject(jKey);
                if (jObject != null) {
                    parse(response, jsonObject);
                } else {
                    response.append(jsonObject.get(jKey)).append("\n");
                }
            }
        }
    }

uj5u.com熱心網友回復：

我更新了您提供的功能以包含您的必填欄位

     while(days.hasNext()) {
        String key = days.next();
        JSONObject day = json.getJSONObject(key);
        JSONArray lessons = day.getJSONArray("lessons");

        int lessonsCount = lessons.length(), i;
        for (i = 0; i < lessonsCount; i = i   1) {
            JSONObject lesson = lessons.getJSONObject(i);
            Iterator<String> lessonKeys = lesson.keys();
            while(lessonKeys.hasNext()) {
                String lessonKey = lessonKeys.next();
                if(!lessonKey.equals("type")) {
                    JSONObject lessonData = lesson.getJSONObject(lessonKey);
                    response  = lessonData.getString("subject") " - " lessonData.getString("teacher") " - " lessonData.get("room") '\n';
                }
            }
        }
    }

輸出如下：

ПМ.2.Р1. ТРОПО - Ахметова Ф.Т. - 212
ПМ.2.Р1. ТРОПО - Ахметова Ф.Т. - 212
ОР и АБД - Кузьмина В.М. - null
ПМ.2.Р5. РС и ПИР со С и ДК - Голубева Я.С. - 211

標籤：爪哇 json 解析

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