/* 获取验证码图片*/@RequestMapping("/getVerifyCode ")public void getVerificationCode(HttpServletResponse response,HttpServletRequest request) {try {int width=200;int height=69;BufferedImage verifyImg=new BufferedImage(width,height,BufferedImage.TYPE_INT_RGB);//生成对应宽高的初始图片String randomText = VerifyCode.drawRandomText(width,height,verifyImg);//单独的一个类方法，出于代码复用考虑，进行了封装。//功能是生成验证码字符并加上噪点，干扰线，返回值为验证码字符                   request.getSession().setAttribute("verifyCode", randomText);response.setContentType("image/png");//必须设置响应内容类型为图片，否则前台不识别OutputStream os = response.getOutputStream(); //获取文件输出流    ImageIO.write(verifyImg,"png",os);//输出图片流os.flush();os.close();//关闭流} catch (IOException e) {this.logger.error(e.getMessage());e.printStackTrace();}}

/*对图片进行处理的类和方法*/public class VerifyCode {  public static  String drawRandomText(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 Color getRandomColor() {Random ran = new Random();Color color = new Color(ran.nextInt(256),ran.nextInt(256), ran.nextInt(256));return color;}}