Java生成动态图形验证码

dome

/*** @ClassName : VerifyCodeController* @Description : 图片验证码* @Author : llh* @Date: 2024-03-22 10:48*/
@Controller
@RequestMapping("/verifycode")
public class VerifyCodeController {@Resourceprivate StringRedisTemplate stringRedisTemplate;@GetMappingpublic void verifyCode(String username , HttpServletResponse response ) throws IOException {//字体只显示大写，去掉了1,0,i,o几个容易混淆的字符String VERIFY_CODES = "23456789ABCDEFGHJKLMNPQRSTUVWXYZ";//宽int IMG_WIDTH = 72;//高int IMG_HEIGTH = 27;Random random = new Random();//创建图片BufferedImage image = new BufferedImage(IMG_WIDTH, IMG_HEIGTH, BufferedImage.TYPE_INT_RGB);//画板Graphics g = image.getGraphics();//填充背景g.setColor(Color.WHITE);//填充边框g.fillRect(1,1,IMG_WIDTH-2,IMG_HEIGTH-2);//设置字体g.setFont(new Font("楷体", Font.BOLD,25));StringBuilder stringCode = new StringBuilder();//写字for(int i = 1 ; i <= 4 ; i ++){//随机颜色g.setColor(new Color(random.nextInt(255),random.nextInt(255),random.nextInt(255)));//随机位置int len = random.nextInt(VERIFY_CODES.length());//随机字母String str = VERIFY_CODES.substring(len,len+1);//追加stringCode.append(str);//写入g.drawString(str, IMG_WIDTH / 6 * i , 22 );}//将验证码存放到redis数据库中stringRedisTemplate.opsForValue().set( "login" + username , stringCode.toString() , 1 , TimeUnit.HOURS);// 干扰线for (int i = 0; i < 30; i++) {//随机颜色g.setColor(new Color(random.nextInt(255),random.nextInt(255),random.nextInt(255)));//随机位置int x = random.nextInt(IMG_WIDTH - 1);int y = random.nextInt(IMG_HEIGTH - 1);int x1 = random.nextInt(12) + 1;int y1 = random.nextInt(6) + 1;g.drawLine(x, y, x - x1, y - y1);}//响应到浏览器ImageIO.write(image,"jpeg", response.getOutputStream());}
}