/*对图片进行处理的类和方法*/
public static StringdrawRandomText(int width, int height, BufferedImage verifyImg) {
Graphics2D graphics = (Graphics2D) verifyImg.getGraphics();
graphics.setColor(Color.WHITE);//设置画笔颜色-验证码背景色
graphics.fillRect(0, 0, width, height);//填充背景
graphics.setFont(new Font("微软雅黑", Font.BOLD, 40));
//数字和字母的组合
String baseNumLetter ="123456789abcdefghijklmnopqrstuvwxyzABCDEFGHJKLMNPQRSTUVWXYZ";
StringBuffer sBuffer =new StringBuffer();
int x =10; //旋转原点的 x 坐标
String ch ="";
Random random =new Random();
for (int i =0; i <4; i++) {
graphics.setColor(getRandomColor());
//设置字体旋转角度
int degree = random.nextInt() %30; //角度小于30度
int dot = random.nextInt(baseNumLetter.length());
ch = baseNumLetter.charAt(dot) +"";
sBuffer.append(ch);
//正向旋转
graphics.rotate(degree * Math.PI /180, x, 45);
graphics.drawString(ch, x, 45);
//反向旋转
graphics.rotate(-degree * Math.PI /180, x, 45);
x +=48;
}
//画干扰线
for (int i =0; i <6; i++) {
// 设置随机颜色
graphics.setColor(getRandomColor());
// 随机画线
graphics.drawLine(random.nextInt(width), random.nextInt(height),
random.nextInt(width), random.nextInt(height));
}
//添加噪点
for (int i =0; i <30; i++) {
int x1 = random.nextInt(width);
int y1 = random.nextInt(height);
graphics.setColor(getRandomColor());
graphics.fillRect(x1, y1, 2, 2);
}
return sBuffer.toString();
}
/**
* 随机取色
*/
private static ColorgetRandomColor() {
Random ran =new Random();
Color color =new Color(ran.nextInt(256),
ran.nextInt(256), ran.nextInt(256));
return color;
}
以上工具类，是生成噪点，干扰线等，可以直接粘贴到类中
@RequestMapping("getQrcode")
public void getQrcode(HttpServletRequest request, HttpServletResponse response) {
定义宽高和image对象
BufferedImage verifyImg=new BufferedImage(200,100,BufferedImage.TYPE_INT_RGB);
生成正确的验证码数字
String qrcodenumber = CodeUtil.drawRandomText(200, 100, verifyImg);
存到session以方便登陆时候验证
request.getSession().setAttribute("qrcodenumber",qrcodenumber);
设置返回到前端的格式
response.setContentType("image/png");
try {
OutputStream outputStream = response.getOutputStream();
写入
ImageIO.write(verifyImg,"png",outputStream);
}catch (IOException e) {
throw new BusinessException(BusinessStatus.FAIL,"IO异常");
}
}
