如何以编程方式将数据写入 JSON 文件然后保存？

Question

我想以编程方式将以下数据放入 Android Studio 中的 JSON 文件中：

[{
    "title":"Olu4a такси",
    "logo":"Taxi/olu4a.jpg",
    "color":"#FFD916",
    "textcolor":"#000000",
    "number":"7000",
    "bigimage":"Taxi/olu4a_car.jpg",
    "star":"4.0"
},
{
    "title":"Asia Express такси",
    "logo":"Taxi/d.jpg",
    "color":"#E7232D",
    "textcolor":"#ffffff",
    "number":"1616",
    "bigimage":"Taxi/asiaexpress.jpg",
    "star":"3.5"
}]

怎么做到呢？

例子

JSONObject obj = new JSONObject(); 

try { 
     obj.put("id", "3"); 
     obj.put("name", "NAME OF STUDENT"); 
     obj.put("year", "3rd"); 
     obj.put("curriculum", "Arts"); 
     obj.put("birthday", "5/5/1993"); 
} catch (JSONException e) { 
     // TODO Auto-generated catch block 
     e.printStackTrace(); 
} 

Answer 1

例如，只需使用 FileWriter 保存到 ExternalFilesDir

public void save(Context context, String jsonString) throws IOException {
  File rootFolder = context.getExternalFilesDir(null);
  File jsonFile = new File(rootFolder, "file.json");
  FileWriter writer = new FileWriter(jsonFile);
  writer.write(jsonString);
  writer.close();
  //or IOUtils.closeQuietly(writer);
}

Answer 2

在将对象序列化为 json 格式时，通常需要使用JsonWriter 。

如果您要做的只是使用您在此处编写的特定内容编写一个文件，您可以使用FileWriter

File file = new File(Environment.getExternalStorageDirectory(), filename);

FileWriter writer = new FileWriter(file);
writer.append(jsonString);
writer.flush();
writer.close();