Extracting text from documents using Java

Extracting the text from the HTM/HTML document i.e. pulling all the text except the HTML tags is done as:

URL url = new URL("http://localhost:8080/index.jsp");  
EditorKit kit = new HTMLEditorKit();  
Document document = kit.createDefaultDocument();  
kit.read(url.openStream(), document, 0);  
System.out.println(document.getText(0, document.getLength()));

For PDF text extraction use pdfbox from www.pdfbox.org

URL url = new URL("http://localhost:8080/Document.pdf");  
PDDocument document = PDDocument.load(url.openStream());  
PDFTextStripper pdfStripper = new PDFTextStripper();  pdfStripper.setSortByPosition(false);  
pdfStripper.setStartPage(1); //from which page to start  
pdfStripper.setEndPage(3);  //on which page to end
System.out.println(pdfStripper.getText(document));  
document.close();

For MS Office Suite documents text extraction use Apache POI ( http://poi.apache.org/ ) Sample code for extracting text from a .doc file is as follows:-

POIFSFileSystem doc = new POIFSFileSystem(new FileInputStream("c:/Resume.doc"));
WordExtractor extractor = new WordExtractor( doc );
System.out.println(extractor.getText());

A good article on the same can be found at http://www.informit.com/guides/content.aspx?g=java&seqNum=354

Change the foreground and background selection color of a JMenuItem.

JCheckBoxMenuItem standard = new JCheckBoxMenuItem(); 
standard.setUI(new chkboxMenuItem(menuSelFore,menuSelBack)); 

class chkboxMenuItem extends BasicCheckBoxMenuItemUI { 
    public chkboxMenuItem(Color selFore,Color selBack) { 
        selectionForeground = selFore; 
        selectionBackground = selBack; 
    } 
}

Changing the swing submenu expanding orientation

To set the orientation of the menu to open the submenus in the left direction ( <-- ) instead of default right direction ( --> ) use :

JMenu prefMenu = new JMenu();
prefMenu.setComponentOrientation(ComponentOrientation.RIGHT_TO_LEFT);

Making a JTree transparent

To make a JTree completely transparent (i.e even after the tree.setOpaque(false) leaves the leaf nodes with white part.. The below code removes even that and makes it totally transparent).

DefaultTreeCellRenderer renderer = new DefaultTreeCellRenderer() {
    public Color getBackgroundNonSelectionColor() {
        return(null);
    }

    public Color getBackground() {
        return(null);
    }
};