文件我有这些方法读取和写入文件:无法读取奇怪的原因
/* 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似乎没什么问题,但是当我运行的代码,我发现了以下错误:
02-15 17:02:07.655: E/log activity(1882): Can not read file: java.io.IOException: open failed: EROFS (Read-only file system)
为什么系统read only
?我在创建文件时应该做些什么,如果它不存在file.createNewFile();
?
我知道我错过了一些非常小的东西,但作为一个初学者,我无法发现它。
当您打算输出文件时,您不需要调用createNewFile(),而您*不应该在您打算输入时调用它,否则您将得到一个空的文件。 – EJP