将json数据写入和读取到内部存储android [英] Write and Read a json data to internal storage android

问题描述

我有一个从 php 接收到的 json 数组

<预><代码>[{"name":"丹尼尔·布莱恩","img":"图片\/最小\/dierdrepic.jpg","用户名":"@dbryan","user_id":"4"},{"name":"恶魔黑客","img":"图片\/最小\/belitapic.jpg","用户名":"@dvHack",用户 ID":1"}]

• 我想要的是在 file_name.anyextension 中写入这个数据我的应用数据文件夹或任何安全的地方.
• 同时从 file_name.anyextension 读取此数据并将其转换为可以进一步编辑的有效 json 数组.

谁能告诉我我怎么可能对这件事?

解决方案

private void writeToFile(String data) {尝试 {OutputStreamWriter outputStreamWriter = new OutputStreamWriter(openFileOutput("config.txt", Context.MODE_PRIVATE));outputStreamWriter.write(data);outputStreamWriter.close();}捕获(IOException e){Log.e("异常", "文件写入失败:" + e.toString());}}私有字符串 readFromFile() {字符串 ret = "";尝试 {InputStream inputStream = context.openFileInput("config.txt");如果(输入流！= null){InputStreamReader inputStreamReader = new InputStreamReader(inputStream);BufferedReader bufferedReader = new BufferedReader(inputStreamReader);字符串接收字符串 = "";StringBuilder stringBuilder = new StringBuilder();while ( (receiveString = bufferedReader.readLine()) != null ) {stringBuilder.append(receiveString);}inputStream.close();ret = stringBuilder.toString();}}抓住(FileNotFoundException e){Log.e("登录活动", "未找到文件:" + e.toString());} catch (IOException e) {Log.e("登录活动", "无法读取文件:" + e.toString());}返回 ret;}

当从文件中读取字符串时，将其转换为 JsonObject 或 JsonArray

JSONArray jarray = new JSONArray(str);

I have a json array received from php

[  
   {  
      "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"
   }
]

• What i want is to write this data in a file_name.anyextension in my apps data folder or anywhere safe.
• Also read this data from file_name.anyextension and convert it to a valid json array that can be further edited.

Can anyone show me a way how can i possibly to this thing ?

解决方案

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;
}

When read string from file convert it to JsonObject or JsonArray

JSONArray jarray = new JSONArray(str);

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