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无法解析JsonObject-错误“无法将字符串转换为JSONObject”

[英]Trouble parsing JsonObject - error 'String cannot be converted to JSONObject'

这是我再次尝试的方法,但无济于事。

我将String切换为double,并更改哈希图中的值以容纳double。 仍然遇到相同的错误.....很难找到没有数组就拉jsonObject的示例

这里的问题是什么?

{“ base”:“ EUR”,“ date”:“ 2017-08-25”,“ rates”:{“ AUD”:1.4919,“ BGN”:1.9558,“ BRL”:3.7045,“ CAD”:1.4769, “ CHF”:1.139,“ CNY”:7.8596,“ CZK”:26.084,“ DKK”:7.4391,“ GBP”:0.92083,“ HKD”:9.2372,“ HRK”:7.414,“ HUF”:304.68,“ IDR “:15758.0,” ILS“:4.2453,” INR“:75.598,” JPY“:129.59,” KRW“:1327.0,” MXN“:20.844,” MYR“:5.0456,” NOK“:9.2278,” NZD“: 1.6363,“ PHP”:60.327,“ PLN”:4.2598,“ RON”:4.5983,“ RUB”:69.831,“ SEK”:9.5053,“ SGD”:1.6055,“ THB”:39.332,“ TRY”:4.108, “ USD”:1.1808,“ ZAR”:15.549}}


 if (jsonStr != null) {
            try {
                JSONObject jsonObj = new JSONObject(jsonStr);


                JSONObject jsonObj2 = jsonObj.getJSONObject("rates");


                double australia = jsonObj2.getDouble("AUD");
                double bulgarian = jsonObj2.getDouble("BDN");
                double brazil = jsonObj2.getDouble("BRL");
                double canadian = jsonObj2.getDouble("CAD");
                double swissfrank = jsonObj2.getDouble("CHF");
                double chinnese = jsonObj2.getDouble("CNY");
                double Czech = jsonObj2.getDouble("CZK");
                double Danish = jsonObj2.getDouble("DKK");
                double british = jsonObj2.getDouble("GBP");
                double hongkong = jsonObj2.getDouble("HKD");
                double croatian = jsonObj2.getDouble("HRK");
                double hungarian = jsonObj2.getDouble("HUF");
                double indonesian = jsonObj2.getDouble("IDR");
                double israeli = jsonObj2.getDouble("ILS");
                double indian = jsonObj2.getDouble("INR");
                double japan = jsonObj2.getDouble("JPY");
                double korean = jsonObj2.getDouble("KRW");
                double mexican = jsonObj2.getDouble("MXN");
                double malaysian = jsonObj2.getDouble("MYR");
                double norwegian = jsonObj2.getDouble("NOK");
                double newzealand = jsonObj2.getDouble("NZD");
                double philippino = jsonObj2.getDouble("PHP");
                double polish = jsonObj2.getDouble("PLN");
                double romanian = jsonObj2.getDouble("RON");
                double russian = jsonObj2.getDouble("RUB");
                double swedish = jsonObj2.getDouble("SEK");
                double singapore = jsonObj2.getDouble("SGD");
                double thai = jsonObj2.getDouble("THB");
                double turkish = jsonObj2.getDouble("TRY");
                double usa = jsonObj2.getDouble("USD");
                double southafrican = jsonObj2.getDouble("ZAR");

                // tmp hash map for single contact
                HashMap<String, Double> contact = new HashMap<>();

                // adding each child node to HashMap key => value
                contact.put("AUD", australia);
                contact.put("BDN", bulgarian);
                contact.put("BRL", brazil);
                contact.put("CAD", canadian);
                contact.put("CHF", swissfrank);
                contact.put("CNY", chinnese);
                contact.put("CZK", Czech);
                contact.put("DKK", Danish);
                contact.put("GBP", british);
                contact.put("HKD", hongkong);
                contact.put("HRK", croatian);
                contact.put("HUF", hungarian);
                contact.put("IDR", indonesian);
                contact.put("ILS", israeli);
                contact.put("INR", indian);
                contact.put("JPY", japan);
                contact.put("KRW", korean);
                contact.put("MXN", mexican);
                contact.put("MYR", malaysian);
                contact.put("NOK", norwegian);
                contact.put("NZD", newzealand);
                contact.put("PHP", philippino);
                contact.put("PLN", polish);
                contact.put("RON", romanian);
                contact.put("RUB", russian);
                contact.put("SEK", swedish);
                contact.put("SGD", singapore);
                contact.put("THB", thai);
                contact.put("TRY", turkish);
                contact.put("USA", usa);
                contact.put("ZAR", southafrican);


                // adding contact to contact list

                contactList.add(contact);

字符串不能转换为JSONObject

问题

JSONArray array = new JSONArray();

为什么使用JSONArray

"rates": {
        "AUD": 1.4919,
        "BGN": 1.9558,

Sol-迭代器JSONObject#keys

            Iterator<String>  iteratorObj = jsonObj2.keys();
            ArrayList<String> al_getAllKeys=new ArrayList<String>();
            while (iteratorObj.hasNext())
            {
                String key = iteratorObj.next();
                ..........
                System.out.println("Key_VALUE: " + key + "------>" + jsonObj2.getString(key));

            }

费耶

为什么选择int australia 它应该是double australia

double australia = ratesObject.getDouble(“ AUD”);

您没有方括号,因此根本不需要与JSONArray相关的类或方法。

使用jsonObj2.getString("AUD")

如果您确实需要数字,请使用getDouble("AUD")

将字符串转换为Json

JSONObject jsonObj = new JSONObject(cursorUsers.getString("String");

当从JSONObject获取字符串时

String str=jsonObj.getString("parseObjectName"));

您的费率是getString() double ,但是您正在调用getString()并将它们存储在int

您的JsonArray array为空,您正在遍历它!

rates是一个jsonObject。 无需循环,只需调用它并通过提供其密钥即可访问每个速率。

double aud = jsonObject2.getDouble("AUD");

double bnd = jsonObject2.getDouble("BND");

您可以通过简单的步骤使用Google的Gson库进行操作,请尝试以下代码

String jsonString = "Your JSON string";

Gson gson = new Gson();

//Convert Json String to Json Object without a POJO class
JsonObject jsonObj = gson.fromJson (jsonString, JsonElement.class).getAsJsonObject();

//Get rates object and convert it to hashmap (For easy access)
HashMap<String, String> ratesMap = gson.fromJson(jsonObj.get("rates").getAsString(), new TypeToken<HashMap<String, String>>(){}.getType());

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