Can't read a file for strange reason [duplicate]

问题

I have these methods for reading and writing to a file:

/* Write content to a file */
    private void writeToFile(ArrayList<String> list) {
        File file = new File("jokesBody1.bjk");     
        FileOutputStream fos;
        if(list != null){
        try {           
                file.createNewFile();
                fos = openFileOutput("jokesBody1.bjk",Context.MODE_PRIVATE);
                ObjectOutputStream out = new ObjectOutputStream(fos);
                out.writeObject(list);
                out.close();
        } catch (FileNotFoundException e) {
                e.printStackTrace();
        } catch (IOException e) {
                e.printStackTrace(); 
        }
        }else{
            try {
                file.createNewFile();
                fos = openFileOutput("jokesBody1.bjk",Context.MODE_PRIVATE);
                ObjectOutputStream out = new ObjectOutputStream(fos);
                out.writeObject("");
                out.close();
        } catch (FileNotFoundException e) {
                e.printStackTrace();
        } catch (IOException e) {
                e.printStackTrace(); 
        }
        }
    }

    /* Read file's content */
    private ArrayList<String> readFromFile() {
        File file = new File("jokesBody1.bjk");
        ArrayList<String> list = new ArrayList<String>();
        try {
            file.createNewFile();
            ObjectInputStream ois = new ObjectInputStream( new FileInputStream( file ) );
            try {
                list = (ArrayList)ois.readObject();
            } catch (ClassNotFoundException e) {
                e.printStackTrace();
            }
            ois.close();
            } catch (IOException e) {
            Log.e("log activity", "Can not read file: " + e.toString());
        }

        return list;
    }

Everyrhing seems to be fine to me, but when I run the code I'm getting the following error:

02-15 17:02:07.655: E/log activity(1882): Can not read file: java.io.IOException: open failed: EROFS (Read-only file system)

Why the system is read only? Should I do something when I'm creating the file if it does not exist by file.createNewFile();?

I know that I'm missing something extremely small, but as a total beginner, I'm not able to spot it.

回答1:

You get this error probably on Linux.
This file system is mounted as read-only.
So you cannot write to it.

来源：https://stackoverflow.com/questions/21804263/cant-read-a-file-for-strange-reason

标签

java

android

android-activity