验证码的生成-蒲公英云

验证码的生成

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();
    }
}