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| public class ImageCodeUtil {
public static final String RANDOMCODEKEY = "RANDOMVALIDATECODEKEY"; private static final Logger logger = LoggerFactory.getLogger(ImageCodeUtil.class);
private String randString = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
private int width = 95; private int height = 25; private int lineSize = 40; private int stringNum = 4; private Random random = new Random();
private Font getFont() { return new Font("Fixedsys", Font.CENTER_BASELINE, 18); } private Color getRandColor(int fc, int bc) { if (fc > 255) { fc = 255; } if (bc > 255) { bc = 255; } int r = fc + random.nextInt(bc - fc - 16); int g = fc + random.nextInt(bc - fc - 14); int b = fc + random.nextInt(bc - fc - 18); return new Color(r, g, b); } public void getRandomCode(HttpServletRequest request, HttpServletResponse response) { HttpSession session = request.getSession(); BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_BGR); Graphics g = image.getGraphics(); g.fillRect(0, 0, width, height); g.setFont(new Font("Times New Roman", Font.ROMAN_BASELINE, 18)); g.setColor(getRandColor(110, 133)); for (int i = 0; i <= lineSize; i++) { drawLine(g); } String randomString = "";
for (int i = 1; i <= stringNum; i++) { randomString = drawString(g, randomString, i); } session.removeAttribute(RANDOMCODEKEY); session.setAttribute(RANDOMCODEKEY, randomString); g.dispose();
try { ImageIO.write(image, "JPEG", response.getOutputStream()); } catch (Exception e) { logger.error("将内存中的图片通过流动形式输出到客户端失败>>>> ", e); }
} private String drawString(Graphics g, String randomString, int i) { g.setFont(getFont()); g.setColor(new Color(random.nextInt(101), random.nextInt(111), random .nextInt(121))); String rand = String.valueOf(getRandomString(random.nextInt(randString .length()))); randomString += rand; g.translate(random.nextInt(3), random.nextInt(3)); g.drawString(rand, 13 * i, 16); return randomString; } private void drawLine(Graphics g) {
int x = random.nextInt(width); int y = random.nextInt(height);
int xl = random.nextInt(13); int yl = random.nextInt(15);
g.drawLine(x, y, x + xl, y + yl);
} public String getRandomString(int num) { return String.valueOf(randString.charAt(num)); } }
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