登陆验证码代码,Java代码库,德仔网

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【Java】登陆验证码
作者:高国清 / 发布于2014/7/17/ 756

	public final class ImageUtil {
	 private static final String[] chars = { "0", "1", "2", "3", "4", "5", "6",
	 "7", "8", "9", "A", "B", "C", "D", "E", "F", "H", "M", "N", "X", "Y", "W", "T" };
	 private static final int SIZE = 4;
	 private static final int LINES =6;
	 private static final int WIDTH = 100;
	 private static final int HEIGHT = 30;
	 private static final int FONT_SIZE = 20;
	
	 public static Map<String,BufferedImage> getImage() {
	 StringBuffer sb = new StringBuffer();
	 BufferedImage image = new BufferedImage(WIDTH, HEIGHT,
	 BufferedImage.TYPE_INT_RGB);
	 Graphics graphic = image.getGraphics();
	 graphic.setColor(Color.LIGHT_GRAY);
	 graphic.fillRect(0, 0, WIDTH, HEIGHT);
	 Random ran = new Random();
	
	 for(int i=1;i<=SIZE;i++){
	 int r = ran.nextInt(chars.length);
	 graphic.setColor(getRandomColor());
	 graphic.setFont(new Font(null,Font.BOLD+Font.ITALIC,FONT_SIZE));
	 graphic.drawString(chars[r],(i-1)*WIDTH/SIZE , HEIGHT/2);
	 sb.append(chars[r]);
	 }
	
	 for(int i=1;i<=LINES;i++){
	 graphic.setColor(getRandomColor());
	 graphic.drawLine(ran.nextInt(WIDTH), ran.nextInt(HEIGHT), ran.nextInt(WIDTH),ran.nextInt(HEIGHT));
	 }
	 Map<String,BufferedImage> map = new HashMap<String,BufferedImage>();
	 map.put(sb.toString(), image);
	 return map;
	 }
	
	 public static Color getRandomColor(){
	 Random ran = new Random();
	 Color color = new Color(ran.nextInt(256),ran.nextInt(256),ran.nextInt(256));
	 return color;
	 }
	--------------------------------------------------
	public class ImageAction extends BaseAction{
	 private InputStream imageStream;
	
	 public String execute(){
	 Map<String,BufferedImage> map =
	 ImageUtil.getImage();
	
	 String code =
	 map.keySet().iterator().next();
	
	 session.put("code", code);
	
	 BufferedImage image = map.get(code);
	
	 ByteArrayOutputStream bos =
	 new ByteArrayOutputStream();
	 JPEGImageEncoder encoder =
	 JPEGCodec.createJPEGEncoder(bos);
	 try {
	 encoder.encode(image);
	
	 byte[] bytes = bos.toByteArray();
	 imageStream = new ByteArrayInputStream(bytes);
	 return "success";
	 } catch (Exception e) {
	 e.printStackTrace();
	 return "f";
	 }
	 }
	
	 public InputStream getImageStream() {
	 return imageStream;
	 }
	
	 public void setImageStream(InputStream imageStream) {
	 this.imageStream = imageStream;
	 }
	
	-------------------------------------------------------
	public class BaseAction implements SessionAware{
	 protected Map<String,Object> session;
	 public void setSession(Map<String, Object> session) {
	 this.session = session;
	 }
	
	}
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