web development helpdesk

Many developers use the toURL() method of the File class to convert a File to a URL. This method however does not handle correctly escaping characters that are illegal in URL’s (such as spaces) and has been deprecated.

To convert a File to a URL you should instead first use the toURI() method to convert the file path to a URI. The URI class has a toURL() method that can then be used to convert the URI to a URL.

File file = new File(path);
URI uri = file.toURI();
URL url = uri.toURL();

// or alternatively in one line

URL url = file.toURI().toURL();

written by objects \\ tags: convert, file, URI, url

You can tell the parseInt() method what base number system is used by the String that is being parsed.

String hex = "01001101";
int n = Integer.parseInt(hex, 2);

written by objects \\ tags: binary, conversion, convert, int, integer, parse

// Load the image

image = new ImageIcon(image).getImage();

// Determine transparency for BufferedImage
// http://helpdesk.objects.com.au/java/how-to-determine-if-image-supports-alpha

boolean hasAlpha = hasAlpha(image);
int transparency = hasAlpha ? Transparency.BITMASK : Transparency.OPAQUE;

// Create the buffered image

GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
GraphicsDevice gs = ge.getDefaultScreenDevice();
GraphicsConfiguration gc = gs.getDefaultConfiguration();
BufferedImage bufferedImage = gc.createCompatibleImage(image.getWidth(null),
		image.getHeight(null), transparency);

if (bufferedImage == null) {
	
	// if that failed then use the default color model
	
	int type = hasAlpha ? BufferedImage.TYPE_INT_ARGB : BufferedImage.TYPE_INT_RGB;
	bufferedImage = new BufferedImage(image.getWidth(null), image.getHeight(null), type);
}

// Copy image

Graphics g = bufferedImage.createGraphics();
g.drawImage(image, 0, 0, null);
g.dispose();

written by objects \\ tags: BufferedImage, ColorModel, convert, image