JSF实现验证码
public class ImageData implements Serializable {private static final long serialVersionUID = -8161565799237268271L;private BufferedImage image;Integer width = 60;Integer height = 20;Color bankgroud = new Color(0xFFFFFF);Color drawColor = new Color(0x000000); Font textFont = new Font("Comic Sans ms", Font.PLAIN, 18); String str = "0,a,2,x,e,5,j,7,l,9,1,b,c,d,4,f,g,h,i,6,k,8,m,n,o,p,q,r,s,t,u,v,w,3,y,z";Random random = new Random();public void paint(OutputStream out, Object data) throws IOException {if (data instanceof ImageData) {// create the imageimage = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);Graphics graphics = image.getGraphics();graphics.setColor(bankgroud);graphics.fillRect(0, 0, width, height);graphics.setColor(drawColor);graphics.drawRect(0, 0, width - 1, height - 1);graphics.setFont(textFont);//绘制干扰线for (int i = 0; i < 160; i++) {int x = random.nextInt(width);int y = random.nextInt(height);int xl = random.nextInt(12);int yl = random.nextInt(12);graphics.setColor(getRandColor(100,250));graphics.drawLine(x, y, x + xl, y + yl);} //绘制验证码graphics.setColor(drawColor);String code="" ;String[] array = str.split(",");for (int i = 0; i < 4; i++) {String rand = array;code += rand;graphics.drawString(rand, 13 * i + 6, 16);} FacesUtil.getSession().setAttribute("code", code);graphics.dispose();}ImageIO.write(image, "JPEG", out);}private Color getRandColor(int fc, int bc) {Random random = new Random();if (fc > 255)fc = 255;if (bc > 255)bc = 255;int r = fc + random.nextInt(bc - fc);int g = fc + random.nextInt(bc - fc);int b = fc + random.nextInt(bc - fc);return new Color(r, g, b);}}<a4j:mediaOutput element="img" cacheable="flase" session="false" rendered="true" createContent="#{validateCodeImageData.paint}" value="#{validateCodeImageData}" mimeType="image/jpeg"> </a4j:mediaOutput>
<managed-bean> <managed-bean-name>validateCodeImageData</managed-bean-name> <managed-bean-class> com.jxh.common.view.ImageData </managed-bean-class> <managed-bean-scope>request</managed-bean-scope> </managed-bean>
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