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copied!<p>JTextPane/JEditorPane do not handle well even 1mb of text (especially text with long lines).</p> <p>You can try JEdit (<a href="http://www.jedit.org/api/org/gjt/sp/jedit/textarea/StandaloneTextArea.html" rel="nofollow">StandaloneTextArea</a>) - it is much faster than Swing text components, but I doubt it will handle this much text. I tried with 45m file, and while it was loaded (~25 seconds) and I could scroll down, I started getting "outofmemory" with 1700m heap.</p> <p>In order to build a really scalable solution there are two obvious options really:</p> <ol> <li><p>Use pagination. You can do just fine with standard Swing by displaying text in pages.</p></li> <li><p>Build a custom text renderer. It can be as simple as a scrollable pane where only the visible part is drawn using <a href="http://docs.oracle.com/javase/7/docs/api/java/io/BufferedReader.html" rel="nofollow">BufferedReader</a> to skip to the desired line in the file and read a limited number of lines to display. I did it before and it is a workable solution. If you need to have 'text selection' capabilities, this is a little more work, of course.</p></li> </ol> <p>For really large files you could build an index file that contains offsets of each line in characters, so getting the "offset" is a quick "<a href="http://docs.oracle.com/javase/7/docs/api/java/io/RandomAccessFile.html" rel="nofollow">RandomAccess</a>" lookup by line number, and reading the text is a "<a href="http://docs.oracle.com/javase/7/docs/api/java/io/BufferedReader.html#skip%28long%29" rel="nofollow">skip</a>" with this offset. Very large files can be viewed with this technique.</p>

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