验证码

class Pair<K, E> {
	private K key;
	private E value;
}



	private static final int WIDTH = 62;
	private static final int HEIGHT = 20;

	private static Color getRandomColor() {
		Random random = new Random();
		return new Color(50 + random.nextInt(100), 50 + random.nextInt(100),
				50 + random.nextInt(100));
	}

	
	private static int getRandomBgInt() {
		Random random = new Random();
		return 180 + random.nextInt(60);
	}

	
	private static Font getRandomFont() {
		Random random = new Random();
		return new Font("Times New Roman", Font.PLAIN, 10 + random.nextInt(8));
	}

	
	public static char getRandomChar() {
		Random random = new Random();
		if (random.nextInt(6) < 3) {
			return (char) (65 + random.nextInt(26));
		}
		if (random.nextInt(6) < 3) {
			return (char) (48 + random.nextInt(10));
		}
		return (char) (97 + random.nextInt(26));
	}

	public static Pair<String, BufferedImage> getImage() {
		BufferedImage image = new BufferedImage(WIDTH, HEIGHT,
				BufferedImage.TYPE_INT_RGB);
		Graphics2D g = image.createGraphics();
		g.setColor(new Color(255, getRandomBgInt(), 255));
		g.fillRect(0, 0, WIDTH, HEIGHT);
		StringBuilder s = new StringBuilder();
		for (int i = 0; i < 4; i++) {
			String t = String.valueOf(getRandomChar());
			s.append(t);
			g.setColor(getRandomColor());
			g.setFont(getRandomFont());
			g.drawString(t, 3 + 16 * i, 18);
		}
		g.dispose();
		return new Pair<String, BufferedImage>(s.toString(), image);
	}

 

<%  
Pair<String, BufferedImage> p = ImageOut.getImage();  
ImageIO.write(p.getValue(), "JPEG", response.getOutputStream());  
out.clear();  
out = pageContext.pushBody();  
session.setAttribute("valid", p.getKey());  
%>  

<img alt="看不清？单击更换！" src="<%=path%>/validateImage.jsp" onclick="changeValidateCode(this)" />  

 

评论

2 楼 wangtong40 2010-06-08  

quxiaoyong 写道

兄弟你是不是没把代码贴完呀？

只是一些核心片段代码，以后注意...将代码以附件形式上传上去，方便大家~~~

1 楼 quxiaoyong 2010-06-08  

兄弟你是不是没把代码贴完呀？