How to divide File in Java

[shaza smart]

Hello Guz. .

Can you help me in my project ..
Draft as follows


>>>
The File chopper takes one file as an input and divides it into a number of files
each file containing x lines. The interface takes the file name as input and the
number of lines, each of the output files should contain. For example, if you give a
file with 20 lines as input and enter 4 as number of lines. Then 5 files will be
generated, each containing only 4 lines of the input file.


My question is how to divide the file to a few lines and I want to create a new file to keep the lines divided by the number that the user enter it

[Ulf Dittmer]

You'll need to use several classes from the java.io package for this. FileReader, BufferedReader, FileWriter and BufferedWriter might all be involved.

Note that FileReader and FileWriter use the platform default encoding, so make sure that's what the text files use. If they use some other encoding, then you'd have to use FileInputStream and InputStreamReader instead of FileReader, and the corresponding classes for writing the file. Those allow you to specify the encoding explicitly.

[Campbell Ritchie]

. . . and welcome to the Ranch

[shaza smart]

Campbell Ritchie wrote: . . . and welcome to the Ranch

Thank you ^^

[shaza smart]

Ulf Dittmer wrote:You'll need to use several classes from the java.io package for this. FileReader, BufferedReader, FileWriter and BufferedWriter might all be involved.

Note that FileReader and FileWriter use the platform default encoding, so make sure that's what the text files use. If they use some other encoding, then you'd have to use FileInputStream and InputStreamReader instead of FileReader, and the corresponding classes for writing the file. Those allow you to specify the encoding explicitly.

Hello .. Thank you to help you but I know this
This is my program and started it, but I have remaining small problem ..
How do I link the counter (longer lines of the file) to the number entered by the user so divided by it and creates a new file on the numbering.

<<

import java.awt.GridLayout;
import java.awt.Color;
import java.awt.Container;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;

import javax.swing.JButton;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JLabel;
//import javax.swing.JTextArea;
import javax.swing.JTextField;

public class Test implements ActionListener{
	//static fields to be accesible from any method in class
	//we can instead make them non static, but we have to access 
	//them through the class object (test) 
	static JTextField textField;
	static JTextField textField1;
	static JButton button1;
	static JButton button2;
	static JButton button3;
	static JButton button4;
	static JLabel label;//الشي الي هنا مسج اريا
	//static JTextArea textArea;
	static JFrame prj;

	public static void main(String[] args) {
		//create window
		prj = new JFrame();
		Test test = new Test();
		//window size
		prj.setBounds(100, 100, 400, 150);
		//window title
		prj.setTitle("Welcome to our Project");

		// Define Components with non default constructor
		button1 = new JButton("file name:Browse");
		button2 = new JButton("number of lines:");	
		button3 = new JButton("Run");
		button4 = new JButton("Close");
		
		textField = new JTextField();
		textField1 = new JTextField();
		
		// Define Layout
     	GridLayout layout = new GridLayout(3,2);
	
		// Define Container
		Container c = prj.getContentPane();
		//set content background color
		c.setBackground(Color.black);// static variable
		
		//set layout of container
		c.setLayout(layout);
	   	c.add(button1); 
	   	c.add(textField); 
	   	c.add(button2);
        c.add(textField1);
        c.add(button3); 
        c.add(button4);
		//to know which button was clicked
		button1.setName("file name:Browse");
		button2.setName("number of lines:");
		button3.setName("Run");
		button4.setName("Close");
        
        textField.setAction(textField.getAction());
        textField1.setAction(textField1.getAction());
		//to create agreement with the listener
		button1.addActionListener(test);
		button2.addActionListener(test);
		button3.addActionListener(test);
		button4.addActionListener(test);
		// Make Visible
		prj.setVisible(true); // boolean data
	}

	public void actionPerformed(ActionEvent e) {
		if (((JButton) e.getSource()).getName().equals("Close")) {
			System.exit(0);
		}

		else if (((JButton) e.getSource()).getName().equals("file name:Browse")) {
			JFileChooser fc = new JFileChooser(); // create object of file
													// Browser
			File file; // create file variable
			fc.setDialogTitle("Open File"); // set Title
			int result = fc.showOpenDialog(prj); // make it visible
			if (result == JFileChooser.APPROVE_OPTION) { // if click ok
				file = fc.getSelectedFile();// get the selected file
			 
				 
			}
		}

	}


	public String readTextFile(File file){
		int counter=0;
	try {
	BufferedReader bfr = new BufferedReader(new FileReader(file));
	String temp="";
	StringBuffer buf = new StringBuffer();
	while ((temp=bfr.readLine())!=null){
   [color=red] counter++;[/color]	}	
	buf.append(counter);
	bfr.close();
	return buf.toString();
	} catch (Exception e) {
	label.setText("Error");
	return "Couldn?t read from file";
	}
	}
}

>>>>>
Please help me the deadline to May 28

[Hunter McMillen]

It would probably be a good idea if you finished the action listener for the rest of your buttons, i.e. 'number of lines:' and 'Run'.

Hunter

[shaza smart]

Sorry ..Do you know How do I create new files are divided depending on the number and stored within the lines divided?

[Hunter McMillen]

The number of files that you need to create is the total # of lines from the source file divided by the number of lines the user wants per file. So you would just need to loop through the source file that number of lines and write those to a different file.

Hunter

[Campbell Ritchie]

You should be able to count the lines as you read, and create new files as you go.

[Hunter McMillen]

The goal of the forum is to help poster's create their own solution, not give them solutions. No one learns anything that way.

Hunter

[Campbell Ritchie]

Agree. But I can remove the post so it does no harm.

[Udara Amarasinghe]

Sorry if I make wrong here . But I just try to help Shaza.

[Campbell Ritchie]

apologies accepted

[shaza smart]

Thank you all
I do not want a solution because it's my project and I want to resolve it myself, but because the Boost time my thoughts really confused and I can not focus

Thank you

[Sean Clark]

Hey,

My advice to you is:

1. Write code that will read the data from one file and write it to another, one line at a time. Once you have that is is simpler to modify to get what you want.
2. Next modify the code to keep a count of the rows as you add them to your file.
3. Modify so that when the count reaches a certain number it closes your current output file, creates a new file with a different filename resets the count and starts writing to the new file. (You may want filenames such as file1.txt, file2.txt... so on, so you may want to also keep a count of which file you were on)

Try this, if you are having trouble while following this then post the appropriate code and we will help you based on that.

Hope that helps.

Sean

[Udara Amarasinghe]

Hi shaza,

I agree with Seans advises. Are you still confused? and what kind of help you need?