Java 将JSON对象写入文件-追加无效

我正在尝试将自定义JSONObject保存到文件中。一切正常，但我无法将json追加到文件中。例如，如果我单击两次保存json，我的文件中有一个元素。这是我的源代码

public class TransactionFileManager {
public static final File path = Environment.
        getExternalStoragePublicDirectory(Environment.getExternalStorageState() + "/myfolder/");
public static final File file = new File(path, "transaction1.json");

public static String read() {
    String ret = null;
    try {
        BufferedReader bufferedReader = new BufferedReader(new FileReader(file));
        try {
            String receiveString;
            StringBuilder stringBuilder = new StringBuilder();
            while ((receiveString = bufferedReader.readLine()) != null) {
                stringBuilder.append(receiveString);
            }
            ret = stringBuilder.toString();
            bufferedReader.close();
        } catch (NumberFormatException | IOException e) {
            e.printStackTrace();
        }
    } catch (FileNotFoundException e) {
        try {
            file.createNewFile();
        } catch (IOException ioe) {
            ioe.printStackTrace();
        }
        e.printStackTrace();
    }
    return ret;
}


public static void writeToFile(JSONObject data) {
    if (!path.exists()) {
        path.mkdirs();
    }
    try {
        FileOutputStream fOut = new FileOutputStream(file);
        OutputStreamWriter outputStreamWriter = new OutputStreamWriter(fOut);
        outputStreamWriter.append(data.toString());
        outputStreamWriter.close();
        fOut.flush();
        fOut.close();
    } catch (IOException e) {
        Log.e("Exception", "File write failed: " + e.toString());
    }
}

}

如何将json对象附加到.json文件中。我的代码中有什么错误

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谢谢

首先，您需要准备完整字符串，就像您单击两次一样，然后创建组合字符串，然后您需要写入文件。请在@faldujaldeph告诉我更多关于它的信息。您的意思是我每次都必须组合字符串文件，然后将其放入数据库，对吗？是否可以不每次合并？写入操作将是最后一次。首先，您需要创建字符串，然后再将所需内容写入文件。。。