Solved

JFileChooser problem

Posted on 2003-10-27
17
250 Views
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
0
Comment
Question by:javadud
  • 10
  • 5
17 Comments
 
LVL 15

Accepted Solution

by:
Javatm earned 500 total points
Comment Utility
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
0
 
LVL 15

Expert Comment

by:Javatm
Comment Utility
It is rather for a text file. :)
0
 

Author Comment

by:javadud
Comment Utility
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.
0
 
LVL 15

Expert Comment

by:Javatm
Comment Utility
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
Comment Utility
Dont forget to add this into your JFileChooser :
File fileName = x.getSelectedFile();
0
 

Author Comment

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

Expert Comment

by:Javatm
Comment Utility
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
0
How your wiki can always stay up-to-date

Quip doubles as a “living” wiki and a project management tool that evolves with your organization. As you finish projects in Quip, the work remains, easily accessible to all team members, new and old.
- Increase transparency
- Onboard new hires faster
- Access from mobile/offline

 
LVL 15

Expert Comment

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

Author Comment

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

Expert Comment

by:Javatm
Comment Utility
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
Comment Utility
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
Comment Utility
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
Comment Utility
Cheers Javatm appreciate the help
Catcha round
0
 
LVL 15

Expert Comment

by:Javatm
Comment Utility
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
Comment Utility
Still there friend :)
0

Featured Post

Highfive Gives IT Their Time Back

Highfive is so simple that setting up every meeting room takes just minutes and every employee will be able to start or join a call from any room with ease. Never be called into a meeting just to get it started again. This is how video conferencing should work!

Join & Write a Comment

By the end of 1980s, object oriented programming using languages like C++, Simula69 and ObjectPascal gained momentum. It looked like programmers finally found the perfect language. C++ successfully combined the object oriented principles of Simula w…
Are you developing a Java application and want to create Excel Spreadsheets? You have come to the right place, this article will describe how you can create Excel Spreadsheets from a Java Application. For the purposes of this article, I will be u…
Viewers learn about the “for” loop and how it works in Java. By comparing it to the while loop learned before, viewers can make the transition easily. You will learn about the formatting of the for loop as we write a program that prints even numbers…
Viewers learn how to read error messages and identify possible mistakes that could cause hours of frustration. Coding is as much about debugging your code as it is about writing it. Define Error Message: Line Numbers: Type of Error: Break Down…

771 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

7 Experts available now in Live!

Get 1:1 Help Now