从内部存储读取JSON文件的内容 [英] Read content of JSON File from Internal Storage

问题描述

如何从内部存储输出JSON文件的内容?以下是当前正在处理的内容.

How can I output the content of a JSON file from Internal Storage? The following is what am currently working on.

String filename = "names.json";
final File file = new File(Environment.getDataDirectory(), filename);
Log.d(TAG, String.valueOf(file));

日志显示为:/data/names.json

names.json

[
  "names",
  {
    "name": "John Doe"
  }
]

推荐答案

从文件中读取字符串并将其转换为JsonObject或JsonArray

Read string from file and convert it to JsonObject or JsonArray

String jsongString = readFromFile();
JSONArray jarray = new JSONArray(str);

使用以下方法从内部存储文件读取数据并以String的形式返回.

Use below method to read data from internal storage file and return as String.

private String readFromFile() {

    String ret = "";
    InputStream inputStream = null;
    try {
        inputStream = openFileInput("names.json");

        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);
            }

            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());
    }
    finally {
      try {
         inputStream.close();
      } catch (IOException e) {
        e.printStackTrace();
      }
    }

    return ret;
}

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