[英]is storing data using file input/output stream method secure
如果我使用文件輸入/輸出流方法,即使它是基本安全性,存儲在應用程序中的數據是否也是安全的,例如它是否會使未經授權訪問該數據變得更加困難? 這是數據存儲的類。
public class Utilities {
public static final String FILE_EXTENSION = ".bin";
public static boolean saveNote(Context context, Notes notes){
String fileName = String.valueOf(notes.getDateTime()) + FILE_EXTENSION;
FileOutputStream fos;
ObjectOutputStream oos;
try {
fos = context.openFileOutput(fileName, context.MODE_PRIVATE);
oos = new ObjectOutputStream(fos);
oos.writeObject(notes);
oos.close();
fos.close();
} catch (IOException e) {
e.printStackTrace();
return false; //tell the user something went wrong
}
return true;
}
public static ArrayList<Notes> getSavedNotes(Context context) {
ArrayList<Notes> notes = new ArrayList<>();
File filesDir = context.getFilesDir();
filesDir.getAbsolutePath();
ArrayList<String> noteFiles = new ArrayList<>();
for(String file : filesDir.list()) {
if(file.endsWith(FILE_EXTENSION)) {
noteFiles.add(file);
}
}
FileInputStream fis;
ObjectInputStream ois;
for(int i = 0; i < noteFiles.size(); i++) {
try{
fis = context.openFileInput(noteFiles.get(i));
ois = new ObjectInputStream(fis);
notes.add((Notes)ois.readObject());
fis.close();
ois.close();
} catch (IOException | ClassNotFoundException e) {
e.printStackTrace();
return null;
}
}
return notes;
}
public static Notes getNoteByName(Context context, String fileName) {
File file = new File(context.getFilesDir(), fileName);
Notes notes;
if(file.exists()) {
FileInputStream fis;
ObjectInputStream ois;
try {
fis = context.openFileInput(fileName);
ois = new ObjectInputStream(fis);
notes = (Notes) ois.readObject();
fis.close();
ois.close();
} catch(IOException | ClassNotFoundException e){
e.printStackTrace();
return null;
}
return notes;
}
return null;
}
public static void deleteNote(Context context, String fileName) {
File Dir = context.getFilesDir();
File file = new File(Dir, fileName);
if (file.exists()) file.delete();
}
}
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