| | |
| | | import java.awt.image.BufferedImage; |
| | | import java.io.ByteArrayOutputStream; |
| | | import java.io.IOException; |
| | | import java.util.Map; |
| | | import java.util.*; |
| | | import java.awt.*; |
| | | |
| | | @Component |
| | | public class CaptchaUtil { |
| | |
| | | //生成文字验证码 |
| | | String text = producer.createText(); |
| | | //生成文字对应的图片验证码 |
| | | BufferedImage image = producer.createImage(text); |
| | | BufferedImage image = creatImage(text); |
| | | //将图片写出 |
| | | ByteArrayOutputStream outputStream = new ByteArrayOutputStream(); |
| | | ImageIO.write(image, "jpg", outputStream); |
| | |
| | | token.put("img", encoder.encode(outputStream.toByteArray())); |
| | | return Result.ok(token); |
| | | } |
| | | |
| | | private static final long serialVersionUID = 1L; |
| | | |
| | | //给定范围获得随机颜色 |
| | | 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); |
| | | } |
| | | |
| | | public BufferedImage creatImage(String code) { |
| | | int width = 150, height = 42; |
| | | //生成随机类 |
| | | Random random = new Random(); |
| | | BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB); |
| | | //获取图形上下文 |
| | | Graphics g = image.getGraphics(); |
| | | // 设定背景色 |
| | | g.setColor(getRandColor(200, 250)); |
| | | g.fillRect(0, 0, width, height); |
| | | //设定字体 第二个参数为字体为加粗 |
| | | g.setFont(new Font("Times New Roman", Font.BOLD, 45)); |
| | | // 随机产生155条干扰线,使图象中的认证码不易被其它程序探测到 |
| | | g.setColor(getRandColor(160, 200)); |
| | | 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); |
| | | } |
| | | // 取随机产生的认证码(4位数字) |
| | | for (int i = 0; i < code.length(); i++) { |
| | | String rand = code.substring(i, i + 1); |
| | | // 将认证码显示到图象中 |
| | | g.setColor(new Color(20 + random.nextInt(110), 20 + random.nextInt(110), 20 + random.nextInt(110))); |
| | | //调用函数出来的颜色相同,可能是因为种子太接近,所以只能直接生成 |
| | | g.drawString(rand, 30 * i + 18, 35); |
| | | } |
| | | // 图象生效 |
| | | g.dispose(); |
| | | return image; |
| | | } |
| | | |
| | | } |