Thread: diplay a large text in JTextArea (>2GB)

Default diplay a large text in JTextArea (>2GB)

Hi All,

I trying to display a text in JTextArea.
For example :I want to read 23 lines. In my JTextArea I read only the first 10 lines. By moving the scrollbar I obtains the following 10 lines. And at the end 3 last ones. Nevertheless, I should be able to return behind.
All the file must be present in JTextArea.

Here 's my code. If somebody has an idea.

 private String string;
    	public MyDocument() {
    		try {
    			int offset = 0;
    			int x = 0;
    			for (int i = 0; i < 1024; i++) {
    				string = UUID.randomUUID().toString() + "\n";
    				if ((string != null) && (x < 10)) {
    					x++;
    				}
    				insertString(offset, string, null);
    				offset += string.length();
    			}
    		} catch (BadLocationException e) {
    			// TODO Auto-generated catch block
    			e.printStackTrace();
    		}
    	}
 
    	@Override
    	public String getText(int offset, int length) throws BadLocationException {
    		System.out.println(String.format("getText: Offset %d / Length: %d",
    				offset, length));
 
    		return super.getText(offset, length);
    	}
 
    	@Override
    	public void getText(int offset, int length, Segment seg)
    			throws BadLocationException {
    		System.out.println(String.format(
    				"getTextWithSegment: Offset %d / Length: %d", offset, length));
    		super.getText(offset, length, seg);
    	}
 
    	@Override
    	public int getLength() {
    		int length = super.getLength();
    		System.out.println("getLength: " + length);
    		return length;
    	}

my main class:

    public GetTextClasse() {
    		JTextArea textArea = new JTextArea(new MyDocument());
    		setLayout(new GridLayout(1, 1));
 
    		add(new JScrollPane(textArea));
 
    	}
 
    	public static void main(String[] args) {
    		JFrame frame = new JFrame();
    		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    		frame.setSize(800, 600);
    		frame.getContentPane().add(new GetTextClasse());
    		frame.setVisible(true);
 
    	}

Thanks.

The code you posted won't compile. Can you make a small, complete program that will compile and execute and demonstrate your problem.

ok,

package guiTest;

import java.util.UUID;

import javax.swing.text.BadLocationException;
import javax.swing.text.PlainDocument;
import javax.swing.text.Segment;

public class MyDocument extends PlainDocument{


/**
*
*/
private static final long serialVersionUID = 7224102265305934163L;
private String string;
MyDocument(){

try {
int offset = 0;
int x = 0;
for (int i = 0; i < 1024; i++) {
string = UUID.randomUUID().toString() + "\n";
if ((string != null) && (x < 10)) {
x++;
}
insertString(offset, string, null);
offset += string.length();

}
} catch (BadLocationException e) {
e.printStackTrace();
}
}

@Override
public String getText(int offset, int length) throws BadLocationException {
// TODO Auto-generated method stub
System.out.println(String.format("getText: Offset %d / Length: %d",
offset, length));
return super.getText(offset, length);

}

@Override
public void getText(int offset, int length, Segment txt)
throws BadLocationException {
// TODO Auto-generated method stub
System.out.println(String.format(
"getTextWithSegment: Offset %d / Length: %d", offset, length));
super.getText(offset, length, txt);
}

@Override
public int getLength() {
// TODO Auto-generated method stub
int lenght = super.getLength();
System.out.println("getLenght:" + lenght);
return lenght;
}
}

main class :

package guiTest;

import java.awt.GridLayout;

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;

public class TestGui extends JPanel {

/**
*
*/
private static final long serialVersionUID = 6547379747523116652L;

TestGui(){
JTextArea textArea = new JTextArea(new MyDocument());
setLayout(new GridLayout(1,1));

add(new JScrollPane(textArea));
}

/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
JFrame frame = new JFrame("test personel");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOS E);
frame.getContentPane().add(new TestGui());
frame.setSize(400, 300);
frame.setVisible(true);

}

}

What is supposed to happen when I execute your test program?
I get a scrollable area with lots of lines (1024) of data.

I changed one line so I could see what lines were being displayed:

string = "i=" + i + " " + UUID.randomUUID().toString() + "\n";

Anyone eva found a solution for this?