將json數據寫入並讀取到內部存儲android

Question

我有從php收到的json數組

[  
   {  
      "name":"Daniel Bryan",
      "img":"pictures\/smallest\/dierdrepic.jpg",
      "username":"@dbryan",
      "user_id":"4"
   },
   {  
      "name":"Devil Hacker",
      "img":"pictures\/smallest\/belitapic.jpg",
      "username":"@dvHack",
      "user_id":"1"
   }
]

• 我想要的是將這些數據寫入我的apps數據文件夾中的file_name.anyextension或任何安全的地方。
• 還要從file_name.anyextension讀取此數據並將其轉換為可以進一步編輯的有效json array 。

任何人都可以告訴我一個方法我怎么可能這個東西？

Answer 1

private void writeToFile(String data) {
    try {
        OutputStreamWriter outputStreamWriter = new OutputStreamWriter(openFileOutput("config.txt", Context.MODE_PRIVATE));
        outputStreamWriter.write(data);
        outputStreamWriter.close();
    }
    catch (IOException e) {
        Log.e("Exception", "File write failed: " + e.toString());
    } 
}


private String readFromFile() {

    String ret = "";

    try {
        InputStream inputStream = context.openFileInput("config.txt");

        if ( inputStream != null ) {
            InputStreamReader inputStreamReader = new InputStreamReader(inputStream);
            BufferedReader bufferedReader = new BufferedReader(inputStreamReader);
            String receiveString = "";
            StringBuilder stringBuilder = new StringBuilder();

            while ( (receiveString = bufferedReader.readLine()) != null ) {
                stringBuilder.append(receiveString);
            }

            inputStream.close();
            ret = stringBuilder.toString();
        }
    }
    catch (FileNotFoundException e) {
        Log.e("login activity", "File not found: " + e.toString());
    } catch (IOException e) {
        Log.e("login activity", "Can not read file: " + e.toString());
    }

    return ret;
}

從文件讀取字符串時將其轉換為JsonObject或JsonArray

JSONArray jarray = new JSONArray(str);

Answer 2

更正了Morteza Soleimani的答案：

public static String readFromFile(String path) {
    String ret = "";
    try {
        InputStream inputStream = new FileInputStream(new File(path));

        if ( inputStream != null ) {
            InputStreamReader inputStreamReader = new InputStreamReader(inputStream);
            BufferedReader bufferedReader = new BufferedReader(inputStreamReader);
            String receiveString = "";
            StringBuilder stringBuilder = new StringBuilder();
            while ( (receiveString = bufferedReader.readLine()) != null ) {
                stringBuilder.append(receiveString);
            }
            inputStream.close();
            ret = stringBuilder.toString();
        }
    }
    catch (FileNotFoundException e) {
        Log.e("FileToJson", "File not found: " + e.toString());
    } catch (IOException e) {
        Log.e("FileToJson", "Can not read file: " + e.toString());
    }
    return ret;
}