IO no longer works when running on Linux

Question

Hi everyone,
I have some code which was originally developed and running on a Windows environment, now I am trying to get it working under Linux. Some of the JSP file which output data as text files do not display correctly, I assume that if I change the JSP files to the UNIX newline characters this will fix the problem?
The other issue is that there is some code which saves data to a file, the directory given may be local or on a network. It worked fine under Windows, but throws an Exception below when running under Linux even when using the UNIX like path structure (/machinename/dir/dir/filename). The code is below:
          byte[] data = /*method that gets the data to save*/;
          String fileDir = this.addExtraBackslashes(config.getOutputDirectory()); // getOutputDirectory sets the directory String
          String filePath = fileDir + fileName; // String fileName is set elsewhere in this code
          FileOutputStream fos = null;
          try {
               fos = new FileOutputStream(filePath);
               fos.write(data);
          } catch (FileNotFoundException e) {
               // TODO Auto-generated catch block
               throw new Exception("Error saving file:-" + filePath +", please check the output path in the configuration", e);
          } catch (IOException e) {
               // TODO Auto-generated catch block
               throw new Exception("Error saving file:-" + filePath+", please check the output path in the configuration", e);
          } finally {
               if (fos != null) {
                    try {
                         fos.close();
                    } catch (IOException e) {
                         log.warn("error closing file stream:" + filePath);
     private String addExtraBackslashes(String s) {
          StringBuffer sbRet = new StringBuffer();
          for (int i = 0;i < s.length();i++) {
               char ch = s.charAt(i);
               switch (ch) {
                    case '\\':
                         sbRet.append('\\');
                         sbRet.append(ch);
                         break;
                    default:
                         sbRet.append(ch);
                         break;
          return sbRet.toString();
     }Anyone have any ideas of what could be the problem and possible solutions?
Thanks,

Answer 1

People would have more of an idea if you posted the full exception text and a clue as to which line it was thrown from.
Also, WTF is with all the addExtraBackslashes stuff? It looks like it's going through and doubling-up each \ character. I'm guessing this won't do anything on Linux if you've configured your paths to use / instead, but even so, what did it do on Windows?!
And what are the values of fileDir and filePath? Does fileDir end in a /? Instead of having to worry about that, you could use new File(fileDir, filePath) to construct an abstract path and pass that to your FileOutputStream.