On Wed, 5 Jun 2002, GOVINDA,RAJ (Non-HP-Cupertino,ex1) wrote:
> Dude look at your while loop. While loop would break when line is
> null. So when you write to the file the line obviously null.
C'mon guys, this is TOTALLY off-topic -- if you want to discuss it,
take it off the list.
> Here is one way you can do the stuff
>
> try {
> String username = "tree_l";
> String group = "foreign";
> File grp = new File("/home/ejantk_a/temp/groups");
> FileReader raf = new FileReader(grp);
> BufferedReader in = new BufferedReader(raf);
> String line;
>
> /** Code added **/
> StringBuffer buffer = new StringBuffer();
>
> //Search for group name, and replace with group name plus username.
> while((line = in.readLine()) != null) {
> Perl5Util perl = new Perl5Util();
> if(perl.match("/" + group + "/", line)) {
> line = perl.substitute("s/" + group + "/($1) " + username + ",
> /", line);
> }
> buffer.append(line).append(File.separatorChar);
> }
>
> //Write to File Object.
> FileWriter fw = new FileWriter(grp);
> PrintWriter pw = new PrintWriter(fw);
> pw.println(line);
> fw.close();
>
> } catch (IOException e) {
> System.out.println("Error -- " + e.toString());
> }
>
>
> -----Original Message-----
> From: Ajay Ejantkar [mailto:[EMAIL PROTECTED]]
> Sent: Wednesday, June 05, 2002 3:18 PM
> To: [EMAIL PROTECTED]
> Subject: edit file
>
>
> I am attempting to edit a file called groups by adding a username to it. My
> code reads the file with filereader. Each line is readin, and searched for
> the group (foreign in this case). Then "foreign username," is substituted
> into the string for foreign. Then the file is written. The result is the
> groups file shows just null in it. My Code is below, any help on this would
> be greatly appreciated. Thanks
>
> try {
> String username = "tree_l";
> String group = "foreign";
> File grp = new File("/home/ejantk_a/temp/groups");
> FileReader raf = new FileReader(grp);
> BufferedReader in = new BufferedReader(raf);
> String line;
>
> //Search for group name, and replace with group name plus username.
> while((line = in.readLine()) != null) {
> Perl5Util perl = new Perl5Util();
> if(perl.match("/" + group + "/", line)) {
> line = perl.substitute("s/" + group + "/($1) " + username + ",
> /", line);
> }
> }
>
> //Write to File Object.
> FileWriter fw = new FileWriter(grp);
> PrintWriter pw = new PrintWriter(fw);
> pw.println(line);
> fw.close();
>
> } catch (IOException e) {
> System.out.println("Error -- " + e.toString());
> }
>
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Milt Epstein
Research Programmer
Systems and Technology Services (STS)
Campus Information Technologies and Educational Services (CITES)
University of Illinois at Urbana-Champaign (UIUC)
[EMAIL PROTECTED]
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