jsp漂亮验证码

<%@ page import="java.awt.*, java.awt.image.*, javax.imageio.*, java.util.*, javax.servlet.*" %>
<%
    // 设置验证码长度和宽度
    int width = 150, height = 30;
    BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
    Graphics g = image.getGraphics();
    Random random = new Random();

    // 填充背景色
    g.setColor(getRandColor(200, 250));
    g.fillRect(0, 0, width, height);

    // 绘制干扰线
    for (int i = 0; i < 155; i++) {
        int x = random.nextInt(width);
        int y = random.nextInt(height);
        int xl = random.nextInt(12);
        int yl = random.nextInt(12);
        g.drawLine(x, y, x + xl, y + yl);
    }

    // 生成随机字符
    String captcha = "";
    for (int i = 0; i < 4; i++) {
        String rand = String.valueOf(random.nextInt(10));
        captcha += rand;
        g.setColor(new Color(20 + random.nextInt(110), 20 + random.nextInt(110), 20 + random.nextInt(110)));
        g.drawString(rand, 30 * i + 6, 20);
    }

    // 将验证码存入session
    session.setAttribute("captcha", captcha);

    // 输出图像
    response.setContentType("image/jpeg");
    ImageIO.write(image, "JPEG", response.getOutputStream());
    out.clear();
    out = pageContext.pushBody();
%>
<%!
    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);
    }
%>