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將 JSON 解析為 Map

Java

呼啦一陣風(fēng) 2023-09-13 10:18:04

我正在嘗試將以下 JSON 字符串解析為鍵值對(duì)，以便我可以將其插入數(shù)據(jù)庫(kù)中的表中。{ "name": "MyMobile", "category": "cellphone", "details": { "displayAspectRatio": "97:3", "audioConnector": "none", "motherBoard": { "Rom": "256GB", "Ram": "8GB", "Battery": "400mAH" } }}我可以使用以下代碼解析 JSON 字符串GSON并將其存儲(chǔ)到Map. 但不幸的是，它對(duì)于嵌套 JSON 對(duì)象效果不佳。public static HashMap<String, Object> createHashMapFromJsonString(String json) {JsonObject object = (JsonObject) parser.parse(json);Set<Map.Entry<String, JsonElement>> set = object.entrySet();Iterator<Map.Entry<String, JsonElement>> iterator = set.iterator();HashMap<String, Object> map = new HashMap<String, Object>();while (iterator.hasNext()) { Map.Entry<String, JsonElement> entry = iterator.next(); String key = entry.getKey(); JsonElement value = entry.getValue(); if (null != value) { if (!value.isJsonPrimitive()) { if (value.isJsonObject()) { map.put(key, createHashMapFromJsonString(value.toString())); } else if (value.isJsonArray() && value.toString().contains(":")) { List<HashMap<String, Object>> list = new ArrayList<>(); JsonArray array = value.getAsJsonArray(); if (null != array) { for (JsonElement element : array) { list.add(createHashMapFromJsonString(element.toString())); } map.put(key, list); } } else if (value.isJsonArray() && !value.toString().contains(":")) { map.put(key, value.getAsJsonArray()); } } else { map.put(key, value.getAsString()); } } } return map; }}我希望我的地圖中有以下行。誰(shuí)能指導(dǎo)我正確的方法？name = MyMobilecategory = cellphonedetails.displayAspectRatio = 97:3details.audioConnector = nonedetails.motherBoard.Rom = 256GBdetails.motherBoard.Ram = 8GBdetails.motherBoard.Battery = 400mAH

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1 回答

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TA貢獻(xiàn)1802條經(jīng)驗(yàn) 獲得超5個(gè)贊

對(duì)于嵌套的 JSON，上述問(wèn)題可以通過(guò)遞歸來(lái)解決。請(qǐng)參閱下面的代碼。注意：僅處理 Map、//TODO ArrayList 和異常處理

@Test

public void testJsonToMap() {

String data = "{\"name\":\"MyMobile\",\"category\":\"cellphone\",\"details\":{\"displayAspectRatio\":\"97:3\",\"audioConnector\":\"none\",\"motherBoard\":{\"Rom\":\"256GB\",\"Ram\":\"8GB\",\"Battery\":\"400mAH\"}}}";

Gson gson = new GsonBuilder().create();

Map jsonMap = gson.fromJson(data, Map.class);

System.out.println(jsonMap);

Sep2019JavaTest test = new Sep2019JavaTest();

Map opMap = test.toMap(jsonMap, new HashMap<String, Object>(), "");

System.out.println(opMap);

}

private Map toMap(Map ipMap, Map opMap, String parentKey) {

if (ipMap != null && !ipMap.isEmpty()) {

ipMap.forEach((k, v) -> {

String key = parentKey.isEmpty() ? k.toString() : parentKey.concat(".").concat(k.toString());

if (v.getClass() == LinkedTreeMap.class) {

toMap((Map) v, opMap, key);

} else {

opMap.put(key, v);

}

});

}

return opMap;

}

//Output

//{details.motherBoard.Rom=256GB, details.motherBoard.Battery=400mAH, name=MyMobile, category=cellphone, details.audioConnector=none, details.motherBoard.Ram=8GB, details.displayAspectRatio=97:3}

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