parsing files in applets

[janani]

how to upload a xls or txt file and parse the same using java applets???

[D_C]

Careful. For security reasons, Java applets don't let you read files.

It is possible, but there are some hoops that need to be jumped through. I ran into this problem during the end of the semester of a group project. We did not have the time to figure it out.

I have some old code from that project I can post here. If you can figure it out, great. This reads a text file into a String array, each line of text getting it's own entry.

   public String[] readFile(String fileName)
   {
      String file = "";
      String temp;

      String[] lines = new String[1];
      String[] moreLines = new String[0];
      int INDEX = 0;

      try
      {
         FileReader fr = new FileReader(fileName);
         BufferedReader br = new BufferedReader(fr);
         do
         {
            temp = br.readLine();
            if(temp == null)
               break;
            else
            {
               if(INDEX == lines.length)  // add more entries, could make a subroutine but
               {                          // this should be the only code that needs this.
                  moreLines = new String[1+(int)(lines.length*1.618)];
                  System.arraycopy(lines,0,moreLines,0,lines.length);
                  lines = moreLines;
               }
               lines[INDEX++] = temp;
            }
         } while(true); // do
      }

      catch (FileNotFoundException fnfe)
      {
         System.err.println("The file " + fileName + " was not found.");
      }

      catch (IOException ioe)
      {
         System.err.println("There is an error in the file.");
         // file.length() should be 0
      }

      catch (Exception e)
      {
         System.out.println("An unknown error occurred.");
         System.out.println(e);
      }

      moreLines = new String[INDEX];
      System.arraycopy(lines,0,moreLines,0,INDEX);
      return moreLines;
   }