Name: gsC80088 Date: 02/16/99


The Document model used by JEditorPane uses WAY TO MUCH memory when loading a 1 MB file. This can easily be seen by looking at the memory used by the Java process when running the attached code. You'll need to create your own 1 meg text file and put the file name into my code. Run the code two ways: (1) loading text into the document model and (2) after commenting out the line which loads the Document model.

(1) results in memory usage of 29.5 MB (in NT Workstation 4.0)
(2) results in usage of 16.6 MB

import java.awt.*;
import java.io.*;
import javax.swing.*;
import javax.swing.text.*;

class TestPad extends JPanel {
    TestPad() {
     super( true );

//{{INIT_CONTROLS
//}}
    }
    public static void main( String[] args ) {
char[] buff = new char[4096];
int aChar, numChars;
        
        JFrame frame = new JFrame();
        JEditorPane editor = new JEditorPane();
     JScrollPane scroller = new JScrollPane();
     scroller.getViewport().add( editor );
// add your file name here =>
        File yourOneMegFileHere = new File( "c:\\temp\\onemeg.txt" );
        try {
            BufferedReader fReader = new BufferedReader( new FileReader( yourOneMegFileHere ) );
            StringBuffer strBuff = new StringBuffer();
while ( ( numChars = fReader.read( buff, 0, buff.length ) ) != -1)
       strBuff.append( new String( buff, 0, numChars ) );
// comment out line BELOW
// editor.getDocument().insertString( 0, strBuff.toString(), null );
// } catch( BadLocationException e ) {
// comment out line ABOVE
} catch( IOException e ) {
        }
     frame.getContentPane().add( scroller );
     frame.setSize( 500, 600 );
        frame.setVisible( true );
    }
}
(Review ID: 52461)
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