创建和写入文件

Question

if (!file.exists())
  file.mkdirs();
  file.createNewFile();

The error states that I have a problem with actually 'writing' Go Falcons to the file, it will state that the file access is denied, Does that mean something is wrong with my code?

Error states: FileNotFoundException Access is denied

PS: how do I actually read this file, once it's writable?

Answer 1

Change:

if (!file.exists())
  file.mkdirs();
  file.createNewFile();

To:

if (!file.exists()) {
  file.createNewFile();
}

But first, go read some tutorials or articles. Why are you extending Exception ?

Answer 2

If I understand your question, one approach would be to use a PrintWriter

public static void main(String[] args) {
  File outFile = new File(System.getenv("HOME") // <-- or "C:/" for Windows.
      + "/hello.txt");
  try {
    PrintWriter pw = new PrintWriter(outFile);
    pw.println("Go Falcons");
    pw.close();
  } catch (FileNotFoundException e) {
    e.printStackTrace();
  }
}

Which creates a single line ascii file in my home folder named "hello.txt".

$ cat hello.txt
Go Falcons

Answer 3

Your problem is that right before you attempt to create your output file, you first create a directory with the same name:

            if (!file.exists())
                file.mkdirs();      // creates a new directory
            file.createNewFile();   // fails to create a new file

Once you've already created the directory, you can no longer create the file, and of course, you cannot open a directory and write data to it as if it were a file, so you get an access denied error.

Just delete the file.mkdirs(); line and your code will work fine:

        if (!file.exists())
            file.createNewFile();   // creates a new file

Answer 4

You can take the substring of the path till folder structure(excluding file name) and create directories using method mkdirs() . Then create file using createNewFile() method. After that write to newly created file. Don't forget to handle exceptions.