验证码的生成

布满荆棘的人生 2023-06-13 09:25 124阅读 0赞

import java.awt.Color;
    import java.awt.Font;
    import java.awt.Graphics;
    import java.awt.image.BufferedImage;
    import java.io.IOException;
    import java.util.Random;
    
    import javax.imageio.ImageIO;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    
    import org.springframework.stereotype.Controller;
    import org.springframework.web.bind.annotation.RequestMapping;
    
    import com.lutongnet.constant.AbstractSessionData;
    
    /** * 验证码控制器 * @author lizhangyu * @Date 2019-11-14 */
    @Controller
    public class VerifyCodeController { 
    
        /** * 获取随机颜色 * @param fc 种子数 * @param bc 种子数 * @return 颜色对象 */
        public 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);
        }
     /** * 生成校验码 * @param request HttpServletRequest对象 * @param response HttpServletResponse对象 * @throws IOException IO操作异常 */
        @RequestMapping(value = "/login/verifyCode")
        public void genereate(HttpServletRequest request, HttpServletResponse response) throws IOException { 
            int width = 60;
            int height = 20;
            BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
    
            Graphics g = image.getGraphics();
    
            Random random = new Random();
    
            g.setColor(getRandColor(200, 250));
            g.fillRect(0, 0, width, height);
    
            g.setFont(new Font("Times New Roman", Font.PLAIN, 18));
    
            g.setColor(getRandColor(160, 200));
    				for (int i = 0; i < 10; 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);
            }String sRand = "";
            for (int i = 0; i < 4; i++) { 
                String rand = String.valueOf(random.nextInt(10));
                sRand += rand;
                g.setColor(new Color(20 + random.nextInt(110), 20 + random.nextInt(110), 20 + random.nextInt(110)));
                g.drawString(rand, 13 * i + 6, 16);
            }
    
            request.getSession().setAttribute(AbstractSessionData.VERIFY_CODE, sRand);
    
            g.dispose();
    
            response.setHeader("Pragma", "No-cache");
            response.setHeader("Cache-Control", "no-cache");
            response.setDateHeader("Expires", 0);
    
            ImageIO.write(image, "JPEG", response.getOutputStream());
            response.getOutputStream().close();
        }
    }