problem trying to display the contents of a text file in JTextArea

hello.
I’m having difficulty trying to view the contents of a text file in a JTextArea. when i run the following program, i press the View Order button. but no data from the Order.txt file is being displayed in the text area (i've attached the .txt file to this message). how can i fix this problem?

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

public class ViewOrder extends JFrame{
JPanel pnlText, pnlBody, pnlFooter;
JButton btnViewOrder;
JButton btnReturnToOrderSystem;
JLabel jl;
JTextArea jta;
Container contentpane;

public ViewOrder(){
super("View Order");
contentpane = getContentPane();
contentpane.setLayout(new BorderLayout());
pnlText = new JPanel();
pnlBody = new JPanel();
pnlFooter = new JPanel();
jta = new JTextArea(250, 250);
jta.setFont(new Font("Serif", Font.PLAIN, 12));

// Set lineWrap and wrapStyleWord true for the text area
jta.setLineWrap(true);
jta.setWrapStyleWord(true);
jta.setEditable(false);

// Create a scroll pane to hold the text area
JScrollPane jsp = new JScrollPane(jta);

// Set BorderLayout for the panel, add label and scrollpane
pnlBody.add(jsp, BorderLayout.CENTER);

jl = new JLabel("Text retrieved from file:");
btnViewOrder = new JButton("View Order");
btnReturnToOrderSystem = new JButton("Return to Order System Menu");
pnlText.add(jl);
pnlFooter.add(btnViewOrder);
pnlFooter.add(btnReturnToOrderSystem);
contentpane.add(pnlText,BorderLayout.NORTH);
contentpane.add(pnlBody,BorderLayout.CENTER);
contentpane.add(pnlFooter,BorderLayout.SOUTH);
setSize(500, 500);
setVisible(true);

btnViewOrder.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
//Read from file
try{
FileInputStream in = new FileInputStream("Order.txt");
BufferedReader iS = new BufferedReader(new InputStreamReader(in));
StringWriter sw = new StringWriter();
PrintWriter out = new PrintWriter(sw);
String il;

while ((il = iS.readLine()) != null){
out.println(il);
}

out.flush();
jta.setText(sw.toString());

in.close();
iS.close();
sw.close();
out.close();
}
catch(java.io.IOException ex){
System.out.println("Cannot read from file");
}
}
});

btnReturnToOrderSystem.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
setVisible(false);
//OrderSystem os = new OrderSystem();
//os.setVisible(true);
}
});
}

public static void main(String[] args){
new ViewOrder();
}
}

You took the hard way, all you need is a filename, FileReader, and to call the JTextArea's read method.

Code:

---

File openAs = new File("Order.txt");
FileReader in = new FileReader(openAs);
textArea.read(in, openAs.toString());

---

Dude So many thanks !! :D this helps a lot

You're welcome. However, try not to post on threads that are a year old.

Hello Friend,

I have tried to store the file content into JTextArea using this code snippet. But nothing displayed in the JTextArea.

Quote:

---

Originally Posted by Bluefox815

You took the hard way, all you need is a filename, FileReader, and to call the JTextArea's read method.

Code:

---

File openAs = new File("Order.txt");
FileReader in = new FileReader(openAs);
textArea.read(in, openAs.toString());

---

---

then you have a bug somewhere. How about starting your own new thread on this and posting a small compilable program that tries to do what you want here and nothing more -- tries to read a file and display it in a JTextArea, and we'll see if we can help you. Before posting code though, please read the FAQ regarding use of code tags.

Hello Friend,

I have pasted the sample program which i use.
The only markable difference is i am using huge size files to display. The size may be morethan 100 MB. Please help me out.:confused:

Code:

---

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

public class ViewOrder extends JFrame{
JPanel pnlText, pnlBody, pnlFooter;
JButton btnViewOrder;
JButton btnReturnToOrderSystem;
JLabel jl;
JTextArea jta;
Container contentpane;

public ViewOrder(){
super("View Order");
contentpane = getContentPane();
contentpane.setLayout(new BorderLayout());
pnlText = new JPanel();
pnlBody = new JPanel();
pnlFooter = new JPanel();
jta = new JTextArea(250, 250);
jta.setFont(new Font("Serif", Font.PLAIN, 12));

// Set lineWrap and wrapStyleWord true for the text area
jta.setLineWrap(true);
jta.setWrapStyleWord(true);
jta.setEditable(false);

// Create a scroll pane to hold the text area
JScrollPane jsp = new JScrollPane(jta);

// Set BorderLayout for the panel, add label and scrollpane
pnlBody.add(jsp, BorderLayout.CENTER);

jl = new JLabel("Text retrieved from file:");
btnViewOrder = new JButton("View Order");
btnReturnToOrderSystem = new JButton("Return to Order System Menu");
pnlText.add(jl);
pnlFooter.add(btnViewOrder);
pnlFooter.add(btnReturnToOrderSystem);
contentpane.add(pnlText,BorderLayout.NORTH);
contentpane.add(pnlBody,BorderLayout.CENTER);
contentpane.add(pnlFooter,BorderLayout.SOUTH);
setSize(500, 500);
setVisible(true);

btnViewOrder.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
//Read from file
try{
File openAs = new File("D://mgc12ux_network.log");
// This file is huge in size. More than 100 MB
FileReader in = new FileReader(openAs);
jta.read(in, openAs.toString());
}
catch(java.io.IOException ex){
System.out.println("Cannot read from file");
}
}
});

btnReturnToOrderSystem.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
setVisible(false);
//OrderSystem os = new OrderSystem();
//os.setVisible(true);
}
});
}

public static void main(String[] args){
new ViewOrder();
}
}

---

Friend, I will gladly try to help you if you follow our instructions. Again, start a new thread on this, and don't hijack somebody else's thread.

hi all,
I have simple solution,
it is function read the content of any file,then display it on the JtextArea
or TextArea.

Code:

---

private void setTextContent(String Path)
        {       
                try
                {
                                java.io.DataInputStream o=new java.io.DataInputStream(       
                                new java.io.FileInputStream(Path));
                        String buf="",ur_text="";
                        while((buf=o.readLine())!=null)
                        {
                                ur_text+=buf;
                        }
                        // Now the ur_text ready to  displayed on the text elemnet
            //this.jta.setText(ur_text);
                        System.out.println(ur_text);
                }
                catch(java.io.IOException ioe)
                {
                        ioe.printStackTrace();
                }
    }

---

that's it :)

Your function is not very good. In my opinion, if you have to edit a function to get what you want out of it, the function needs to be rewritten. What you might do differently is make the function return the "ur_text" string and set the JTextArea's text content with the returned string. I've written an equivalent function with different code, only two lines need to be changed in yours to make it return a string.

Code:

---

private String getFileContents(String path) throws java.io.IOException {
        try {
                StringBuilder contents = new StringBuilder(), line;
                java.io.BufferedReader in = new java.io.BufferedReader(java.io.FileReader(path));
                while ((line = in.readLine()) != null) {
                        contents.append(line); // this is faster than "String += String"
                }
        } catch (FileNotFoundException fnfe) {
                System.err.println("The file \"" + path + "\" could not be found.");
                return null;
        }
        return contents.toString();
}

JTextArea textArea = new JTextArea();
textArea.setText(getFileContents("files/textfile.txt"));

---

Quote:

---

Code:

---

contents.append(line); // this is faster than "String += String"

---

---

friend Bluefox815,you have a point
and this v.good notice
---------------------

Hi all I'm New , I'm face same problem when i open more than 10MB Text file but when I open 7MB Text file it's open fine . I dont understand please help me ....


Hello_Kolkata

Hi,
Small changes in ur code.

rows and columns are more .
I have made it as 50,50 to make it scroll.
And then StringWriters getBuffer() method i called on that i called toString to get the text.Run this code and check once.

Code:

---

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

public class ViewOrder extends JFrame{
JPanel pnlText, pnlBody, pnlFooter;
JButton btnViewOrder;
JButton btnReturnToOrderSystem;
JLabel jl;
JTextArea jta;
Container contentpane;

public ViewOrder(){
super("View Order");
contentpane = getContentPane();
contentpane.setLayout(new BorderLayout());
pnlText = new JPanel();
pnlBody = new JPanel();
pnlFooter = new JPanel();
[B]jta = new JTextArea(50,50);[/B]
jta.setFont(new Font("Serif", Font.PLAIN, 12));

// Set lineWrap and wrapStyleWord true for the text area
jta.setLineWrap(true);
jta.setWrapStyleWord(true);
jta.setEditable(false);

// Create a scroll pane to hold the text area
JScrollPane jsp = new JScrollPane(jta);

// Set BorderLayout for the panel, add label and scrollpane
pnlBody.add(jsp, BorderLayout.CENTER);

jl = new JLabel("Text retrieved from file:");
btnViewOrder = new JButton("View Order");
btnReturnToOrderSystem = new JButton("Return to Order System Menu");
pnlText.add(jl);
pnlFooter.add(btnViewOrder);
pnlFooter.add(btnReturnToOrderSystem);
contentpane.add(pnlText,BorderLayout.NORTH);
contentpane.add(pnlBody,BorderLayout.CENTER);
contentpane.add(pnlFooter,BorderLayout.SOUTH);
setSize(500, 500);
setVisible(true);

btnViewOrder.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
//Read from file
try{
FileInputStream in = new FileInputStream("Order.txt");
BufferedReader iS = new BufferedReader(new InputStreamReader(in));
StringWriter sw = new StringWriter();
PrintWriter out = new PrintWriter(sw);
String il;

while ((il = iS.readLine()) != null){
out.println(il);
}
System.out.println(sw.getBuffer().toString());

[B]jta.setText(sw.getBuffer().toString()); [/B]

out.flush();

in.close();
iS.close();
sw.close();
out.close();
}
catch(java.io.IOException ex){
System.out.println("Cannot read from file");
}
}
});

btnReturnToOrderSystem.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
setVisible(false);
//OrderSystem os = new OrderSystem();
//os.setVisible(true);
}
});
}

public static void main(String[] args){
new ViewOrder();
}
}

---

VERY old thread people... time to leave it.

Hi Singing Boyo,
Great catch Man!!!!!!!!!!!!!!!!!!
I have not checked the date of the thread.........
Tnx:D:D:D

-Regards
Ramya

However this thread is old,Can we display the document file contents into TextArea with out modifications.??

Thank u for reply
when i view below 8mb file it's open fine but when I view more than 8mb ... nothing happened... I am waiting about 1/2 hour but still same ...
I am using NetBeans IDE 6.5.1
Please help me ....

Again, let's not hijack an old thread for this.

I'm locking this old thread. hello kolkata, if you still have a question, please start a new thread, and please post enough information so that your question is possible to answer. Currently we see no code, no error messages.