首先通过controller层进行业务数据访问如下:
@RequestMapping(value = "/generVerifyCode",method = RequestMethod.GET) void imageVerifyCode(HttpServletResponse response)throws Exception { response.setHeader("Pragma","No-cache"); response.setHeader("Cache-Control","no-cache"); response.setDateHeader("Expires",0); response.setContentType(MediaType.IMAGE_JPEG_VALUE); String code = ImageCodeUtils.generateVerifyCode(4); int w = 200,h = 80; ImageCodeUtils.outputImage(w, h, response.getOutputStream(), code); }
具体的业务生成代码如下:
public class ImageCodeUtils { //使用到Algerian字体,系统里没有的话需要安装字体,字体只显示大写,去掉了1,0,i,o几个容易混淆的字符 static final String VERIFY_CODES = "23456789ABCDEFGHJKLMNPQRSTUVWXYZ"; static Random random = new Random(); /** * 使用默认字符源码生成验证码 * @param verifySize * @return */ public static String generateVerifyCode(int verifySize){ return generateVerifyCode(verifySize,VERIFY_CODES); } /** * 使用指定源生成验证码 * @param verifySize * @param sources * @return */ public static String generateVerifyCode(int verifySize,String sources){ if(sources == null || sources.length() == 0){ sources = VERIFY_CODES; } int codesLen = sources.length(); Random rand = new Random(System.currentTimeMillis()); StringBuilder verifyCode = new StringBuilder(verifySize); for(Integer i=0;i<verifySize;i++){ verifyCode.append(sources.charAt(rand.nextInt(codesLen-1))); } return verifyCode.toString(); } /** * 输出置顶验证码图片流 * @param w * @param h * @param os * @param code * @throws Exception */ public static void outputImage(int w, int h, OutputStream os,String code)throws Exception{ int verifySize = code.length(); BufferedImage image = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB); Random rand = new Random(); Graphics2D gd = image.createGraphics(); gd.setRenderingHint(RenderingHints.KEY_ANTIALIASING,RenderingHints.VALUE_ANTIALIAS_ON); Color[] colors = new Color[5]; Color[] colorSpaces = new Color[] { Color.WHITE, Color.CYAN, Color.GRAY, Color.LIGHT_GRAY, Color.MAGENTA, Color.ORANGE, Color.PINK, Color.YELLOW }; float[] fractions = new float[colors.length]; for(int i = 0; i < colors.length; i++){ colors[i] = colorSpaces[rand.nextInt(colorSpaces.length)]; fractions[i] = rand.nextFloat(); } Arrays.sort(fractions); gd.setColor(new Color(250, 252, 253));// 设置边框色 gd.fillRect(0, 0, w, h); gd.setColor(Color.WHITE);// 设置背景色 gd.fillRect(0, 0, w, h); // 添加噪点 float yawpRate = 0.1f;// 噪声率 int area = (int) (yawpRate * w * h); for (int i = 0; i < area; i++) { int x = random.nextInt(w); int y = random.nextInt(h); int rgb = getRandomIntColor(); image.setRGB(x, y, rgb); } //绘制干扰线 Random random = new Random(); gd.setColor(Color.gray);// 设置线条的颜色 for (int i = 0; i < 16; i++) { int x = random.nextInt(w); int y = random.nextInt(h); int xl = random.nextInt(12); int yl = random.nextInt(12); gd.drawLine(x, y, x + xl, y + yl); } //shear(gd, w, h, Color.WHITE);// 使图片扭曲 gd.setColor(getRandColor(100, 160)); int fontSize = h-35; Font font = new Font("Fixedsys", Font.PLAIN,fontSize); gd.setFont(font); char[] chars = code.toCharArray(); for(Integer i = 0; i < verifySize; i++){ AffineTransform affine = new AffineTransform(); affine.setToRotation(Math.PI / 4 * rand.nextDouble() * (rand.nextBoolean() ? 1 : -1), (w / verifySize) * i + fontSize/2, h/2); gd.setTransform(affine); gd.setColor(new Color(20 + random.nextInt(110),20 + random.nextInt(110), 20 + random.nextInt(110))); gd.drawChars(chars, i, 1, (((w-10) / verifySize) * i + 5), h/2 + fontSize/2 - 10); } gd.dispose(); ImageIO.write(image, "jpg", os); } private static int getRandomIntColor() { int[] rgb = getRandomRgb(); int color = 0; for (int c : rgb) { color = color << 8; color = color | c; } return color; } private static int[] getRandomRgb() { int[] rgb = new int[3]; for (int i = 0; i < 3; i++) { rgb[i] = random.nextInt(255); } return rgb; } public static 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); }