JSF实现验证码

原文：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 image
            image = 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[random.nextInt(36)];
                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"/>

<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>

 

 

 

 

评论

2 楼 stenlylee 2009-05-11  

zhiblin 写道

facesUtil 这个是自己写的类吗

是的

1 楼 zhiblin 2009-05-09  

facesUtil 这个是自己写的类吗