/*** 获取随机字符** @param length* @return java.lang.String**/
public static String getStringRandom(int length) {String val = "";Random random = new Random();// 参数length，表示生成几位随机数for (int i = 0; i < length; i++) {String charOrNum = random.nextInt(2) % 2 == 0 ? "char" : "num";// 输出字母还是数字if ("char".equalsIgnoreCase(charOrNum)) {// 输出是大写字母还是小写字母int temp = random.nextInt(2) % 2 == 0 ? 65 : 97;val += (char) (random.nextInt(26) + temp);} else if ("num".equalsIgnoreCase(charOrNum)) {val += String.valueOf(random.nextInt(10));}}return val;
}

/*** 获取三位随机数** @return*/
public static int getThreeRandomNumber(){Random random = new Random();return random.nextInt(900)+100;
}