工具类

 /*** 生成任意长度 指定类型验证码** @param length* @param codeEnum* @return*/public static String getVerifyCode(int length, VerifyCodeEnum codeEnum) {StringBuffer code = new StringBuffer(SysConstants.DEFAULT_VERIFY_CODE);switch (codeEnum) {case NUMBER:return getRandomNum(length).toString();case MIX:return getRandomMix(length);case CHAR:return getRandomChar(length);default:return code.toString();}}/*** 生成指定长度混合验证码** @param length* @return*/private static String getRandomMix(int length) {StringBuffer code = new StringBuffer();while (length-- > 0) {code.append(new Random().nextInt(100) % 2 == 0 ? getRandomNum(1) : getRandomChar(1));}return code.toString();}/*** 生成指定长度 字符验证码** @param length* @return*/private static String getRandomChar(int length) {StringBuffer code = new StringBuffer();while (length-- > 0) {code.append((char) (new Random().nextInt(26) + 97));}return code.toString();}/*** 随机生成指定长度数字验证码** @return*/public static Integer getRandomNum(int length) {return (int) ((Math.random() + 1) * Math.pow(10d, length - 1));}

枚举类

public enum VerifyCodeEnum {NUMBER("数字",0),CHAR("字母",1),MIX("数字字母混合",2);public String name;public int code;VerifyCodeEnum(String name, int code) {this.name=name;this.code=code;}
}