获取随机数
private String getCharacterAndNumber(int length) { String password = ""; Random random = new Random(); 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)){ // 字符串 int choice = random.nextInt(2) % 2 == 0 ? 65 : 97; //取得大写字母还是小写字母 password += (char) (choice + random.nextInt(26)); }else if("num".equalsIgnoreCase(charOrNum)) { // 数字 password += String.valueOf(random.nextInt(10)); } } return password; } private String getCharacterAndNumber(i 
