ANDROID：如何将数据插入 JSON 文件并将其保存到本地存储？

Question

因此，我计划将输入的数据存储到 JSON 文件中，并且希望将该 JSON 文件存储到手机的本地存储中。但是我的代码中有这个错误。这是关于 JsonWriter。谁能帮我？// THIS IS MY CODEprivate void writeToFile(OutputStream out, List<Wordbank> wordList) throws IOException{    JsonWriter writer = new JsonWriter(new OutputStreamWriter(out, "UTF-8"));    writer.setIndent(" ");    writeWordbankArray(writer, wordList);    writer.close();}public void writeWordbankArray(JsonWriter writer, List<Wordbank> wordList) throws  IOException{    writer.beginArray();    for(Wordbank wl : wordList){        writeWordbank(writer, wl);    }    writer.endArray();}public void writeWordbank(JsonWriter writer, Wordbank wordbank) throws IOException{    writer.beginObject();    writer.name("English").value(wordbank.getEnglish());    writer.name("Cebuano").value(wordbank.getCebuano());    writer.name("Pronounciation").value(wordbank.getPronounciation());    writer.name("POS").value(wordbank.getPos());    writer.name("Audio").value(wordbank.getAudio());    if(wordbank.getImage() != null || wordbank.getFx() != null){        writer.name("Picture").value(wordbank.getImage());        writer.name("Effect").value(wordbank.getFx());    }else{        writer.name("No name").nullValue();    }    writer.endObject();}// 下面是错误2018-10-18 18:48:52.372 4965-4965/com.example.sampleFile/AndroidRuntime: FATAL EXCEPTION: mainProcess: com.example.sampleFile, PID: 4965以上是错误。我需要这方面的帮助，请帮帮我！

Answer 1

您可以使用另一种方法。以下代码

writer.name("English").value(wordbank.getEnglish());

writer.name("Cebuano").value(wordbank.getCebuano());

writer.name("Pronounciation").value(wordbank.getPronounciation());

writer.name("POS").value(wordbank.getPos());

writer.name("Audio").value(wordbank.getAudio());

if(wordbank.getImage() != null || wordbank.getFx() != null){

    writer.name("Picture").value(wordbank.getImage());

    writer.name("Effect").value(wordbank.getFx());

}else{

    writer.name("No name").nullValue();

}

告诉我您已经知道会发生什么，您可以创建一个 POJO 类并使用 Gson 库将该 POJO 对象解析为 JSON 格式的字符串。稍后您可以将其用作

JSONObject jsonObj = new JSONObject(Jsonstring);

这是一个例子

ModelPOJO modelPojo = new ModelPojo();

modelPojo.setEnglish("value");

Gson gson = new Gson();

String jsonString = gson.toJson(modelPojo);

jsonString 是必需的字符串。要将其写入本地存储，您可以采用@jake breen 的方法。

希望能帮助到你 ！:)

Answer 2

try {

            File file = new File("<storage location>" + filename + ".json");

            Writer writer = new BufferedWriter(new FileWriter(file));

            writer.write(jsonObject.toString());

            writer.close();

        } catch (Exception e) {

            Log.e("File Exception: ", e.getMessage());

        }