Dimitris Vyzovitis wrote:
>
> Aaron Gaudio wrote:
>
> > Isn't this a little over-complicated? Couldn't one just open up the file
> > like any other normal file in Java and then read from it? I admit I
> > haven't tried it myself.
> >
>
> /proc contents are special files. They always appear to have size 0 but you
> can always cat them for the current snapshot.
> So, opening as a normal file will not do (try lessing them, you'll know what I
> mean) ;-}
>
> Dimitris
I decided to play with this. Here is a quick class I whipped up to see
what was going on.
import java.io.*;
public class Read {
public static void main(String args[]) {
new Read(args[0]);
}
public Read(String s) {
try {
//First method
BufferedReader bufferedreader = new BufferedReader(new
FileReader(s));
for(String s1 = null; (s1 = bufferedreader.readLine()) != null;)
System.out.println(s1);
bufferedreader.close();
//Second method
System.out.println("Second Try");
File f = new File(s);
long llen = f.length();
int len = (int)(llen & 0x7FFFFFFF);
if (len != llen)
throw new IOException("File too big to read into a single object");
byte[] b = new byte[len];
DataInputStream ds = new DataInputStream(new FileInputStream(f));
ds.readFully(b);
System.out.println (new String(b));
}
catch(Throwable e) {
e.printStackTrace();
}
}
}
Please, no complaints on form, just trying to get a quick n dirty
example to show what's being described. Now, heres a log:
[skellner@asylum] ~/projects> echo "Hello There" > testing
[skellner@asylum] ~/projects> java Read testing
Hello There
Second Try
Hello There
[skellner@asylum] ~/projects> java Read /proc/loadavg
0.01 0.06 0.07 2/79 9467
Second Try
[skellner@asylum]
~/projects>
So it looks like while yes, it is a 0 length file if looked at in that
way, it behaves normally to FileReaders. And yes, everything behaves the
same on multi-line files. So if you wanna read /proc files, try the
first method. And I'm sure there are other ways as well.
--
Sean Kellner
[EMAIL PROTECTED]
