工具类---生成验证码图片工具类
/*** 可生成数字、大写、小写字母及三者混合类型的验证码。* 支持自定义验证码字符数量；* 支持自定义验证码图片的大小；* 支持自定义需排除的特殊字符；* 支持自定义干扰线的数量；* 支持自定义验证码图文颜色*/public class ValidateUtil {/** 验证码类型为仅数字 0~9 */public static final int TYPE_NUM_ONLY = 0;/** 验证码类型为仅字母，即大写、小写字母混合 */public static final int TYPE_LETTER_ONLY = 1;/** 验证码类型为数字、大写字母、小写字母混合 */public static final int TYPE_ALL_MIXED = 2;/** 验证码类型为数字、大写字母混合 */public static final int TYPE_NUM_UPPER = 3;/** 验证码类型为数字、小写字母混合 */public static final int TYPE_NUM_LOWER = 4;/** 验证码类型为仅大写字母 */public static final int TYPE_UPPER_ONLY = 5;/** 验证码类型为仅小写字母 */public static final int TYPE_LOWER_ONLY = 6;private ValidateUtil() {}/*** 生成验证码字符串** @param type 验证码类型，参见本类的静态属性* @param length 验证码长度，大于0的整数* @param exChars 需排除的特殊字符（仅对数字、字母混合型验证码有效，无需排除则为null）* @return 验证码字符串*/public static String generateTextCode(int type, int length, String exChars) {if (length <= 0)return "";StringBuffer code = new StringBuffer();int i = 0;Random r = new Random();switch (type) {// 仅数字case TYPE_NUM_ONLY:while (i < length) {int t = r.nextInt(10);if (exChars == null || exChars.indexOf(t + "") < 0) {// 排除特殊字符code.append(t);i++;}}break;// 仅字母（即大写字母、小写字母混合）case TYPE_LETTER_ONLY:while (i < length) {int t = r.nextInt(123);if ((t >= 97 || (t >= 65 && t <= 90)) && (exChars == null || exChars.indexOf((char) t) < 0)) {code.append((char) t);i++;}}break;// 数字、大写字母、小写字母混合case TYPE_ALL_MIXED:while (i < length) {int t = r.nextInt(123);if ((t >= 97 || (t >= 65 && t <= 90) || (t >= 48 && t <= 57))&& (exChars == null || exChars.indexOf((char) t) < 0)) {code.append((char) t);i++;}}break;// 数字、大写字母混合case TYPE_NUM_UPPER:while (i < length) {int t = r.nextInt(91);if ((t >= 65 || (t >= 48 && t <= 57)) && (exChars == null || exChars.indexOf((char) t) < 0)) {code.append((char) t);i++;}}break;// 数字、小写字母混合case TYPE_NUM_LOWER:while (i < length) {int t = r.nextInt(123);if ((t >= 97 || (t >= 48 && t <= 57)) && (exChars == null || exChars.indexOf((char) t) < 0)) {code.append((char) t);i++;}}break;// 仅大写字母case TYPE_UPPER_ONLY:while (i < length) {int t = r.nextInt(91);if ((t >= 65) && (exChars == null || exChars.indexOf((char) t) < 0)) {code.append((char) t);i++;}}break;// 仅小写字母case TYPE_LOWER_ONLY:while (i < length) {int t = r.nextInt(123);if ((t >= 97) && (exChars == null || exChars.indexOf((char) t) < 0)) {code.append((char) t);i++;}}break;}return code.toString();}/*** 已有验证码，生成验证码图片** @param textCode 文本验证码* @param width 图片宽度* @param height 图片高度* @param interLine 图片中干扰线的条数* @param randomLocation 每个字符的高低位置是否随机* @param backColor 图片颜色，若为null，则采用随机颜色* @param foreColor 字体颜色，若为null，则采用随机颜色* @param lineColor 干扰线颜色，若为null，则采用随机颜色* @return 图片缓存对象*/public static BufferedImage generateImageCode(String textCode, int width, int height, int interLine,boolean randomLocation, Color backColor, Color foreColor, Color lineColor) {BufferedImage bim = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);Graphics g = bim.getGraphics();// 画背景图g.setColor(backColor == null ? getRandomColor() : backColor);g.fillRect(0, 0, width, height);// 画干扰线Random r = new Random();if (interLine > 0) {int x = 0, y = 0, x1 = width, y1 = 0;for (int i = 0; i < interLine; i++) {g.setColor(lineColor == null ? getRandomColor() : lineColor);y = r.nextInt(height);y1 = r.nextInt(height);g.drawLine(x, y, x1, y1);}}// 写验证码// 字体大小为图片高度的80%int fsize = (int) (height * 0.8);int fx = height - fsize;int fy = fsize;g.setFont(new Font("Default", Font.PLAIN, fsize));// 写验证码字符for (int i = 0; i < textCode.length(); i++) {fy = randomLocation ? (int) ((Math.random() * 0.3 + 0.6) * height) : fy;// 每个字符高低是否随机g.setColor(foreColor == null ? getRandomColor() : foreColor);g.drawString(textCode.charAt(i) + "", fx, fy);fx += fsize * 0.9;}g.dispose();return bim;}/*** 生成图片验证码** @param type 验证码类型，参见本类的静态属性* @param length 验证码字符长度，大于0的整数* @param exChars 需排除的特殊字符* @param width 图片宽度* @param height 图片高度* @param interLine 图片中干扰线的条数* @param randomLocation 每个字符的高低位置是否随机* @param backColor 图片颜色，若为null，则采用随机颜色* @param foreColor 字体颜色，若为null，则采用随机颜色* @param lineColor 干扰线颜色，若为null，则采用随机颜色* @return 图片缓存对象*/public static BufferedImage generateImageCode(int type, int length, String exChars, int width, int height,int interLine, boolean randomLocation, Color backColor, Color foreColor, Color lineColor) {String textCode = generateTextCode(type, length, exChars);BufferedImage bim = generateImageCode(textCode, width, height, interLine, randomLocation, backColor, foreColor,lineColor);return bim;}/*** 产生随机颜色** @return*/private static Color getRandomColor() {Random r = new Random();Color c = new Color(r.nextInt(255), r.nextInt(255), r.nextInt(255));return c;}}
编写生成验证码图片的接口：
@RequestMapping(value = "/validateCode",method=RequestMethod.GET)public void validateCode(HttpServletRequest request,HttpServletResponse response) throws IOException {response.setHeader("Cache-Control", "no-cache");String verifyCode = ValidateUtil.generateTextCode(ValidateUtil.TYPE_ALL_MIXED, 4, "0Ooil"); //获取验证码request.getSession().setAttribute("validateCode", verifyCode); //验证码放到session中response.setContentType("image/jpeg");BufferedImage bim = ValidateUtil.generateImageCode(verifyCode, 100, 25,7, true, Color.WHITE, Color.BLACK, null); // 生成验证码图片ImageIO.write(bim, "JPEG", response.getOutputStream()); // 返回到前台}
前端使用：
<img src="/manager/validateCode">
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