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JFileChooser problem

Posted on 2003-10-27
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Last Modified: 2008-02-01
Hi experts,

I am having trouble with a JFileChooser I can get the dialogbox to open ok using the following code:
      public void actionPerformed(ActionEvent e){
            
      if(e.getSource()== openItem){
      JFileChooser chooser = new JFileChooser();
    int result = chooser.showOpenDialog(Frame);
   
    if(result == JFileChooser.APPROVE_OPTION){
          File file = chooser.getSelectedFile();
          String filename = file.getName();

    }else
    input.setText("you cancelled the file dialog");

However I also have an input class that inputs a text file into a string tokenizer, what I would like to do is be able to use the JFileChooser to select a text file and input that into the String tokenizer, any comments would be much appreciated.
Cheers
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Question by:javadud
  • 10
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17 Comments
 
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Accepted Solution

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Javatm earned 500 total points
ID: 9631160
To javadud;

Can you try this, a simple codes for opening a file :
http://www.experts-exchange.com/Programming/Programming_Languages/Java/Q_20770715.html

Hope it helps . . .
JAVATM
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LVL 15

Expert Comment

by:Javatm
ID: 9631168
It is rather for a text file. :)
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Author Comment

by:javadud
ID: 9631190
Thanks for the reply Javatm, but im still not sure how to implement this into the string tokenizer so I can search the string etc.
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LVL 15

Expert Comment

by:Javatm
ID: 9631201
Or try something like this :

   String record = null;

   try {

   BufferedReader br = new BufferedReader( new FileReader( fileName ) );
   record = new String();

   StringTokenizer stTok;

   while ((record = br.readLine()) != null) {

   stTok = new StringTokenizer(record," ");
   
   while (stTok.hasMoreTokens()) {
   System.out.println(stTok.nextToken());

   }
   } // END WHILE
   }

   catch (IOException e) {

   // catch possible io errors from readLine()
   System.out.println("IOException error: ");
   e.printStackTrace();
   }

Hope it helps . . .
JAVATM
0
 
LVL 15

Expert Comment

by:Javatm
ID: 9631208
Dont forget to add this into your JFileChooser :
File fileName = x.getSelectedFile();
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Author Comment

by:javadud
ID: 9631315
Think that is working, but every button I click now opens the JFileChooser???
0
 
LVL 15

Expert Comment

by:Javatm
ID: 9631349
This should do it  :

import java.io.*;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.util.StringTokenizer;


public class Word extends JFrame
{
 private JTextArea t1;
 StringTokenizer stTok;

 public Word()
  {
  super("Word Processor . . .");
  t1 = new JTextArea(30,5);
  JButton b1 = new JButton("Open");
  JButton b2 = new JButton("Save");

  JScrollPane scroll = new JScrollPane(t1);

  JPanel buttonPanel = new JPanel();
  buttonPanel.setLayout( new FlowLayout() );
  buttonPanel.add( b1 );
  buttonPanel.add( b2 );

  getContentPane().setLayout( new BorderLayout() );
  getContentPane().add( scroll, BorderLayout.CENTER);
  getContentPane().add( buttonPanel, BorderLayout.SOUTH);

  setBounds(10,10,200,50);
  setSize(500, 500);
  show();

  b1.addActionListener( new ActionListener()
   {
    public void actionPerformed( ActionEvent ae )
     {
     openMe();
     }
  });

  b2.addActionListener( new ActionListener()
   {
    public void actionPerformed( ActionEvent ae )
     {
     saveMe();
     }
  });
  }

 private void openMe()
  {
  JFileChooser x = new JFileChooser();

  x.setFileSelectionMode( JFileChooser.FILES_ONLY );
  int result = x.showOpenDialog( this );

  if( result == JFileChooser.CANCEL_OPTION )
  return;

  File fileName = x.getSelectedFile();

  if ( fileName == null || fileName.getName().equals( "" ) )
  {
  JOptionPane.showMessageDialog( this,"Select file name . . .","Warning . . .",
  JOptionPane.WARNING_MESSAGE );
  }
  else
  {

  try {

  BufferedReader br = new BufferedReader( new FileReader( fileName ) );

  String record = new String(""+fileName);

  StringTokenizer stTok;

  while ((record = br.readLine()) != null) {

// Here is you String Tokenizer

  stTok = new StringTokenizer(record," ");
   
  while (stTok.hasMoreTokens()) {
  System.out.println(stTok.nextToken());

  }
  } // END WHILE

  } catch (IOException e) {

  // catch possible io errors from readLine()
  System.out.println("IOException error: ");
  e.printStackTrace();
  }

  }
  }


 private void saveMe()
  {
  JFileChooser y = new JFileChooser();

  y.setFileSelectionMode( JFileChooser.FILES_ONLY );
  int result = y.showSaveDialog( this );
  if ( result == JFileChooser.CANCEL_OPTION )
  return;

  File fileName = y.getSelectedFile();
  if ( fileName == null || fileName.getName().equals( "" ) )
  {
  JOptionPane.showMessageDialog( this,"Invalid file name . . .","Warning . . .",
  JOptionPane.WARNING_MESSAGE );
  }
  else
  {
  try
  {
  PrintWriter pw = new PrintWriter ( new FileWriter ( fileName ) );
  pw.print( t1.getText() );
  pw.close();
  }
  catch ( Exception e )
  {
  JOptionPane.showMessageDialog(this,"Error Saving File . . .","Warning . . .",
  JOptionPane.ERROR_MESSAGE);
  }
  }
  }

 public static void main (String args[])
  {
   Word x = new Word();
   x.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  }
 }

Hope it helps . . .
JAVATM
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LVL 15

Expert Comment

by:Javatm
ID: 9631521
Did it work ? if not I can give you a revise codes. :)
0
 

Author Comment

by:javadud
ID: 9631645
sorry for the slow response, I am getting an ArrayIndexOutOfBounds Exception, trying to find the error.
0
 
LVL 15

Expert Comment

by:Javatm
ID: 9631661
Are you trying to incode your own codes ?

1.) If yes, can you give your codes ?
2.) If no, try this :

/* Copyright : Javatm
   http://javatm.4t.com */

import java.io.*;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.util.*;


public class Word extends JFrame {

 private JTextArea t1;
 private JButton b1, b2;

 public Word()
  {
  super("Word Processor . . .");

  t1 = new JTextArea(30,50);

  b1 = new JButton("Open");
  b2 = new JButton("Save");

  JScrollPane scroll = new JScrollPane(t1);

  JPanel buttonPanel = new JPanel();
  buttonPanel.setLayout( new FlowLayout() );
  buttonPanel.add( b1 );
  buttonPanel.add( b2 );

  getContentPane().setLayout( new BorderLayout() );
  getContentPane().add( scroll, BorderLayout.CENTER);
  getContentPane().add( buttonPanel, BorderLayout.SOUTH);

  setBounds(10,10,200,50);
  setSize(500, 500);
  show();

  b1.addActionListener( new ActionListener()
   {
    public void actionPerformed( ActionEvent ae )
     {
     openMe();
     }
  });

  b2.addActionListener( new ActionListener()
   {
    public void actionPerformed( ActionEvent ae )
     {
     saveMe();
     }
  });
  }

 private void openMe()
  {
  JFileChooser x = new JFileChooser();

  x.setFileSelectionMode( JFileChooser.FILES_ONLY );
  int result = x.showOpenDialog( this );

  if( result == JFileChooser.CANCEL_OPTION )
  return;

  File fileName = x.getSelectedFile();

  if ( fileName == null || fileName.getName().equals( "" ) )
  {
  JOptionPane.showMessageDialog( this,"Select file name . . .","Warning . . .",
  JOptionPane.WARNING_MESSAGE );
  }
  else
  {

  try {

  BufferedReader br = new BufferedReader( new FileReader( fileName ) );

  String y = new String(""+fileName);
  String ext = "";

  while ((y = br.readLine()) != null) {
 
  StringTokenizer st = new StringTokenizer(""+y);
  ext = ext + y + "\n";
   
  while (st.hasMoreTokens()) {
 
  // This will show an output on Dos
  System.out.println(st.nextToken());
  }
  }

  br.close();
  t1.setText( ext );

  }  
  catch (IOException e) {
  // This will show an error on Dos
  System.out.println("Error on command . . .");
  e.printStackTrace();
  }
  }
  }

 private void saveMe()
  {
  JFileChooser y = new JFileChooser();

  y.setFileSelectionMode( JFileChooser.FILES_ONLY );
  int result = y.showSaveDialog( this );
  if ( result == JFileChooser.CANCEL_OPTION )
  return;

  File fileName = y.getSelectedFile();
  if ( fileName == null || fileName.getName().equals( "" ) )
  {
  JOptionPane.showMessageDialog( this,"Invalid file name . . .","Warning . . .",
  JOptionPane.WARNING_MESSAGE );
  }
  else
  {
  try {
  PrintWriter pw = new PrintWriter ( new FileWriter ( fileName ) );
  pw.print( t1.getText() );
  pw.close();
  }
  catch ( Exception e ) {
  JOptionPane.showMessageDialog(this,"Error Saving File . . .","Warning . . .",
  JOptionPane.ERROR_MESSAGE);
  }
  }
  }

 public static void main (String args[])
  {
   Word x = new Word();
   x.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  }
 }
0
 
LVL 15

Expert Comment

by:Javatm
ID: 9631770
Dude;

I'm at work & already need to go home, thank you very much for having
sometime with me, anyways here are some research for you :

http://java.sun.com/products/jdk/1.2/docs/api/java/util/StringTokenizer.html
http://developer.java.sun.com/developer/technicalArticles/Programming/stringtokenizer/

Also try this previous topic:

http://www-level3.experts-exchange.com/Programming/Programming_Languages/Java/Q_20681014.html

Hope it helps . . .
JAVATM
0
 

Author Comment

by:javadud
ID: 9631775
Javatm,

here is what I have gotL

private void initMenu(){
            fileMenu = new JMenu("File");
            menuBar.add(fileMenu);
            openItem = new JMenuItem("Open");
            fileMenu.add(openItem);
                       openItem.addActionListener( new ActionListener()
   {
    public void actionPerformed( ActionEvent ae )
     {
     openMe();
     }
  });
}
      public void openMe()
  {
  JFileChooser x = new JFileChooser();

  int result = x.showOpenDialog( this );

  if( result == JFileChooser.CANCEL_OPTION )
  return;

  File fileName = x.getSelectedFile();
  FileName = fileName.toString();

  if ( fileName != null)
  {
        try {
            BufferedReader inStream
                = new BufferedReader(new FileReader(fileName));
                   
            String thisLine = inStream.readLine();
           
            while (thisLine != null) {
                numberOfRows++;
                thisLine = inStream.readLine();
            }
           
            inStream.close();
        }
       
        catch (IOException e) {
            System.out.println("A File I/O error has occured.");
        }              
    }

        
    try {
            BufferedReader inStream
                = new BufferedReader(new FileReader(fileName));
                   
            String thisLine = inStream.readLine();

           
            details = new Customer[numberOfRows];            
           
            int row = 0;
                       
            while (thisLine != null)
            {
       
               StringTokenizer lineDetails = new StringTokenizer(thisLine,",");
               
               id = lineDetails.nextToken();
               name = lineDetails.nextToken();
               address = lineDetails.nextToken();
               ph = lineDetails.nextToken();
               accType = lineDetails.nextToken();
               lastPurDate = lineDetails.nextToken();
               maxCredit = Integer.parseInt(lineDetails.nextToken());
               currBalance = Integer.parseInt(lineDetails.nextToken());
               details[row] = new Customer(id,name,address,ph,accType,lastPurDate,
               maxCredit,currBalance);
                                   
               thisLine = inStream.readLine();            
               row++;                          
            }
           
            inStream.close();                          
           
        } catch (IOException e) {
            System.out.println("A File I/O error has occured.");
        }  
       
    }  

     
    public Customer[] getDetails() {
        if (numberOfRows == 0) {
            openMe();    
        }

        return details;
    }



      public void actionPerformed(ActionEvent e){

            if (e.getSource() == disp){
            
        Customer [] getData = getDetails();
        String getInput = custID.getText();
        Keyword kw = new Keyword(getInput);
        Comparator keywordCompare = new KeywordCompare();
        int found = Arrays.binarySearch(getData,kw,keywordCompare);
        if(found>=0){
            custName.setText(getData[found].name);
            custPh.setText(getData[found].ph);
            String maxCredit = new Integer(getData[found].maxCred).toString();
            String currBalance = new Integer(getData[found].currBal).toString();
            currBal.setText(currBalance);
            maxCred.setText(maxCredit);
            custAcc.setText(getData[found].accType);
            custAddress.setText(getData[found].address);
            custLastPurchase.setText(getData[found].lastPurDate);
            }
            else {
            custID.setText("not found");
            custName.setText("");
            custPh.setText("");
            currBal.setText("");
            maxCred.setText("");
            custAcc.setText("");
            custAddress.setText("");
            custLastPurchase.setText("");
      }
}


                              
if (e.getSource() == add){
      getDetails();
      String [] det ={custID.getText(), custName.getText(),  custAddress.getText(),
          custPh.getText(), custAcc.getText(),  custLastPurchase.getText(),
                maxCred.getText(), currBal.getText()};
      writeTextFile(det);

      
}

}
public void writeTextFile(String det[]) {
                  try {
            FileWriter outfileWrite = new FileWriter(FileName, true);
            BufferedWriter outBufferedWrite = new BufferedWriter(outfileWrite);    
            for(int i=0; i<det.length-1; ++i)
            {   outBufferedWrite.write(det[i] +",");
            }
            outBufferedWrite.write(det[det.length-1]);
            outBufferedWrite.newLine();
            outBufferedWrite.close();
       
        } catch (IOException e) {
            System.out.println("IOERROR: " + e.getMessage() + "\n");
            e.printStackTrace();
        }

}
      
      public static void main(String args[]) {
            System.out.println("Starting Mon_suppliers_app...");
            Monsupp mainFrame = new Monsupp();
            mainFrame.setSize(850, 300);
            mainFrame.setTitle("Mon_suppliers_app");
            mainFrame.setVisible(true);
      }
}

Its working except when i add new customer details I cannot redisplay them in the same session I need to somehow re-read the textfile when the display button is pushed. Any Ideas?
Thanks
0
 

Author Comment

by:javadud
ID: 9631815
Cheers Javatm appreciate the help
Catcha round
0
 
LVL 15

Expert Comment

by:Javatm
ID: 9637017
Friend;

>> What I would like to do is be able to use the JFileChooser to select a text file and input that into the String tokenizer

     Based on the things that we've already done. I already answered this question.
     I gave you 2 things :

     1.) A simulation for your actionlistener.
     2.) A complete code on how to do it.

>> I need to somehow re-read the textfile ?

     This question will be a different question based on the rules of EE. So it should be asked on a different form with
     different points.

     Anyhow I respect your decision on it :)

Hope it helps . . .
Javatm

     
     
0
 
LVL 15

Expert Comment

by:Javatm
ID: 9718767
Still there friend :)
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