jsp生成验证码代码

<%@ 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 = 100;
    int height = 30;
    BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
    
    // 获取图形上下文
    Graphics g = image.getGraphics();
    g.setColor(new Color(255, 255, 255));
    g.fillRect(0, 0, width, height);
    
    // 设置字体和颜色
    g.setFont(new Font("Arial", Font.BOLD, 20));
    g.setColor(new Color(0, 0, 0));
    
    // 随机生成验证码
    Random random = new Random();
    String captcha = "";
    for (int i = 0; i < 5; i++) {
        captcha += random.nextInt(10);
    }
    
    // 将验证码保存到session中
    session.setAttribute("captcha", captcha);
    
    // 绘制验证码
    g.drawString(captcha, 10, 20);
    
    // 添加干扰线
    for (int i = 0; i < 10; i++) {
        int x1 = random.nextInt(width);
        int y1 = random.nextInt(height);
        int x2 = random.nextInt(width);
        int y2 = random.nextInt(height);
        g.setColor(new Color(random.nextInt(255), random.nextInt(255), random.nextInt(255)));
        g.drawLine(x1, y1, x2, y2);
    }
    
    // 输出图像到页面
    response.setContentType("image/jpeg");
    ImageIO.write(image, "jpeg", response.getOutputStream());
%>