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PLease:  I need program which moves files from one directory to another and renames each file to a unique name before placing it to another directory I m handling csv files.

Posted on 2006-11-16
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PLease:  I need program which moves files from one directory to another and renames each file to a unique name before placing it to another directory I m handling csv files.

Files that come in directory where they shoudl be moved from have 10 or more caracters xxxxxxxxxxxxxx.csv  and when they are moved they should be assigned a unique file name of max 8 caracters. Pelase help.
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Question by:dm98101
6 Comments
 
LVL 86

Accepted Solution

by:
CEHJ earned 172 total points
ID: 17957040
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LVL 23

Assisted Solution

by:Ajay-Singh
Ajay-Singh earned 164 total points
ID: 17957377
try this:


    public void move(File sourceDir, File destDir) throws IOException {
        File[] all = sourceDir.listFiles();
        if (null == all || 0 == all.length)
            return;

        for (int i = 0; i < all.length; i++) {
            String name = all[i].getName();
            int idx = name.lastIndexOf('.');
            String extension = null;
            if (idx > 0)
                extension = name.substring(idx + 1);

            File finalFile = new File(destDir, System.currentTimeMillis() + (extension == null ? "" : ("." + extension)));
            while (!finalFile.exists())
                finalFile = new File(destDir, System.currentTimeMillis() + (extension == null ? "" : ("." + extension)));

            if (!all[i].renameTo(finalFile))
                throw new IOException("Rename failed.");
        }
    }
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Expert Comment

by:saintsairforce
ID: 17958620
Hee are some functions I used to accomplish something simular to what you want.       

import java.io.*;
import java.io.File;
import javax.swing.*;
import javax.swing.filechooser.*;

/*******************************************************************************
      loadHTML(String)
      
      This loads html files into the home directory
      *******************************************************************************/
      private void loadHTML(String home)
      {
            String fileDiscription="";
            File intputFile,outputFile;
            
            getFiles();
            
            if(cancelFlag!=JFileChooser.CANCEL_OPTION)
            {
                  for(int knt=0;knt<selectedFiles.length;knt++)
                  {
                        intputFile = new File(directory+"\\"+selectedFiles[knt]);            //sets the location of the input file
                        outputFile = new File(home+selectedFiles[knt]);                              //sets the location of the output file
                        
                        try
                        {      
                              copyFile(intputFile,outputFile,home);
                  }
                        catch(IOException e)
                        {
                              JOptionPane.showMessageDialog(null,"Unable to upload "+selectedFiles[knt],"ERROR",JOptionPane.ERROR_MESSAGE);
                        }
                  }
            }
      }
      
      /*******************************************************************************
      getFiles()
      
      This opens a JFileChooser and allows the user to browse their computer for files.
      *******************************************************************************/
      
      private void getFiles()
      {
            JFileChooser chooser = new JFileChooser();

            chooser.setAcceptAllFileFilterUsed(false);                  //does not allow user to use the AllFiles type option.
            chooser.addChoosableFileFilter(new htmlFilter());      //filters selection to only allow html and htm files
            chooser.setMultiSelectionEnabled(true);                   //Allows the user to select multiple files

            try      //this sets the look and feel of the file chooser to the currently selected look and feel
            {
                  UIManager.setLookAndFeel(UserMenu.looks[UserMenu.lookNumber].getClassName());
                  SwingUtilities.updateComponentTreeUI(this);
            }
            catch(Exception e)
            {
                  new ErrorLogger("Error getFiles() - fileLoader.java:    "+e);
            }
            
            cancelFlag = chooser.showOpenDialog(this);
            
            directory = (chooser.getCurrentDirectory()).toString();      //gets the current directory
            
            File tempFiles[] = chooser.getSelectedFiles();
            
            selectedFiles = new String[tempFiles.length];
            
            for(int knt=0;knt<tempFiles.length;knt++)
            {
                  selectedFiles[knt] = tempFiles[knt].getName();
            }
      }

/*******************************************************************************
      copyFile(File, File, String)
      
      This method copies the input file to the selected output directory.
      *******************************************************************************/
      
      public void copyFile(File inputFile, File outputFile, String directory) throws IOException
      {
            if((new File(directory).mkdir()));             //creates home directory if needed
            
            InputStream inStream = new FileInputStream(inputFile);
            OutputStream outStream = new FileOutputStream(outputFile);
            
            byte[] buffer = new byte[1024];
            int length;
            
            while ((length = inStream.read(buffer)) > 0)
            {
                  outStream.write(buffer, 0, length);
            }
            
            inStream.close();
            outStream.close();
      }

Hopes this helps

Cheers,
Ricky
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Author Comment

by:dm98101
ID: 17963281
Hej Ajay-Singh

How to use this program????
what to writte in sourceDir like C:\file1    just for test or?  
0
 

Author Comment

by:dm98101
ID: 17963581
Hej saintsairforce

I need this for *.csv files????  to be moved as they come to another directory with a unique name with no more than 8 caracters. and they should dissapear from source directory
0
 
LVL 2

Assisted Solution

by:saintsairforce
saintsairforce earned 164 total points
ID: 17975120
Here is an updated program    

import java.io.*;
import java.io.File;
import javax.swing.*;
import javax.swing.filechooser.*;

/*******************************************************************************
     loadHTML(String)
     
     This loads html files into the home directory
     *******************************************************************************/
     private void loadCSV(String home)
     {
          String fileDiscription="";
          File intputFile,outputFile;
         
          getFiles();
         
          if(cancelFlag!=JFileChooser.CANCEL_OPTION)
          {
               for(int knt=0;knt<selectedFiles.length;knt++)
               {
                    intputFile = new File(directory+"\\"+selectedFiles[knt]);          //sets the location of the input file

                         String outFile="xxxxxxxxxx";
                          while(outFile.length>8)
                       {
                               //outFile = get the file name from the user
                               //check that outFile endsWith .csv
                     }
                    outputFile = new File(home+outFile);                         //sets the location of the output file
                   
                    try
                    {    
                         copyFile(intputFile,outputFile,home);
               }
                    catch(IOException e)
                    {
                         JOptionPane.showMessageDialog(null,"Unable to upload "+selectedFiles[knt],"ERROR",JOptionPane.ERROR_MESSAGE);
                    }
               }
          }
     }
     
     /*******************************************************************************
     getFiles()
     
     This opens a JFileChooser and allows the user to browse their computer for files.
     *******************************************************************************/
     
     private void getFiles()
     {
          JFileChooser chooser = new JFileChooser();

          chooser.setAcceptAllFileFilterUsed(false);               //does not allow user to use the AllFiles type option.
          chooser.addChoosableFileFilter(new csvFilter());     //filters selection to only allow html and htm files
          chooser.setMultiSelectionEnabled(true);                //Allows the user to select multiple files

          try     //this sets the look and feel of the file chooser to the currently selected look and feel
          {
               UIManager.setLookAndFeel(UserMenu.looks[UserMenu.lookNumber].getClassName());
               SwingUtilities.updateComponentTreeUI(this);
          }
          catch(Exception e)
          {
               new ErrorLogger("Error getFiles() - fileLoader.java:    "+e);
          }
         
          cancelFlag = chooser.showOpenDialog(this);
         
          directory = (chooser.getCurrentDirectory()).toString();     //gets the current directory
         
          File tempFiles[] = chooser.getSelectedFiles();
         
          selectedFiles = new String[tempFiles.length];
         
          for(int knt=0;knt<tempFiles.length;knt++)
          {
               selectedFiles[knt] = tempFiles[knt].getName();
          }
     }

/*******************************************************************************
     copyFile(File, File, String)
     
     This method copies the input file to the selected output directory.
     *******************************************************************************/
     
     public void copyFile(File inputFile, File outputFile, String directory) throws IOException
     {
          if((new File(directory).mkdir()));           //creates home directory if needed
         
          InputStream inStream = new FileInputStream(inputFile);
          OutputStream outStream = new FileOutputStream(outputFile);
         
          byte[] buffer = new byte[1024];
          int length;
         
          while ((length = inStream.read(buffer)) > 0)
          {
               outStream.write(buffer, 0, length);
          }
         
          inStream.close();
          outStream.close();
     }

//Another Class to filter out the csv files

import java.io.File;
import javax.swing.*;
import javax.swing.filechooser.*;

public class csvFilter extends FileFilter
{
      /*******************************************************************************
      accept(File)
      
      This filters out files and only allows htm and html files to be selected
      *******************************************************************************/
      
      public boolean accept(File file)
      {
            if (file.isDirectory())
                  return true;

            String extension = getExtension(file);
            
            if (extension != null)
            {
                  if (extension.equals("csv")&&(file.toString()).length()>=14) //10+.csv
                        return true;
                  else
                        return false;
            }
            return false;
      }
      
      /*******************************************************************************
      getDescription()
      
      This returns the discription of the available files
      *******************************************************************************/
      
      public String getDescription()
      {
            return ".htm, .html";
      }
      
      /*******************************************************************************
      getExtension(File)
      
      This returns the extension of a file
      *******************************************************************************/
      
      private String getExtension(File file)
      {
                  String ext = null;
                  String name = file.getName();
                  int index = name.lastIndexOf('.'); //finds the index of the '.' thus any data after this is the extension
                  
                  if(index>0&&(index<name.length()-1))
                  {
                        ext = name.substring(index+1).toLowerCase(); //this gets the extension characters
                  }
                  
                  return ext;
      }
}

As for deleting the file go to this link for a simple example http://javaalmanac.com/egs/java.io/DeleteFile.html
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