java - 从内部存储中的url保存JSON文件

对于我的android应用程序，我需要从url下载JSON到android的内部存储，然后从中读取。我认为将其另存为byte []到内部存储中的最佳方法，尽管我在这里遇到了一些问题，但这是我到目前为止编写的

File storage = new File("/sdcard/appData/photos");
storage.mkdirs();

JSONParser jParser = new JSONParser();

// getting JSON from URL
JSONObject json = jParser.getJSONFromUrl(url1);

//transforming jsonObject to byte[] and store it
String jsonString = json.toString();
byte[] jsonArray = jsonString.getBytes();

String filen = "jsonData";
File fileToSaveJson = new File("/sdcard/appData",filen);

FileOutputStream fos;
fos = new FileOutputStream(fileToSaveJson);

fos = openFileOutput(filen,Context.MODE_PRIVATE);
fos.write(jsonArray);
fos.close();


//reading jsonString from storage and transform it into jsonObject
FileInputStream fis;
File readFromJson = new File("/sdcard/appData/jsonData");

fis =  new FileInputStream(readFromJson);

fis =  new FileInputStream(readFromJson);
InputStreamReader isr = new InputStreamReader(fis);

fis.read(new byte[(int)readFromJson.length()]);

但它不会打开文件以进行读取

最佳答案

public static File createCacheFile(Context context, String fileName, String json) {
    File cacheFile = new File(context.getFilesDir(), fileName);
    try {
        FileWriter fw = new FileWriter(cacheFile);
        BufferedWriter bw = new BufferedWriter(fw);
        bw.write(json);
        bw.close();
    } catch (IOException e) {
        e.printStackTrace();

        // on exception null will be returned
        cacheFile = null;
    }

    return cacheFile;
}

public static String readFile(File file) {
    String fileContent = "";
    try {
        String currentLine;
        BufferedReader br = new BufferedReader(new FileReader(file));

        while ((currentLine = br.readLine()) != null) {
            fileContent += currentLine + '\n';
        }

        br.close();
    } catch (IOException e) {
        e.printStackTrace();

        // on exception null will be returned
        fileContent = null;
    }
    return fileContent;
}

关于java - 从内部存储中的url保存JSON文件，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/19315316/