让注册时随机加盐

	public int insertSelective(Admin record){
		record.setSalt(getRandomNickname());
    	return adminDAO.insertSelective(record);
    }

	
public static String getRandomNickname() {
		String val = "";
		Random random = new Random();
		for (int i = 0; i < 8; i++) {
			// 输出字母还是数字
			String charOrNum = random.nextInt(2) % 2 == 0 ? "char" : "num";
			// 字符串
			if ("char".equalsIgnoreCase(charOrNum)) {
				// 取得大写字母还是小写字母
				int choice = random.nextInt(2) % 2 == 0 ? 65 : 97;
				val += (char) (choice + random.nextInt(26));
			} else if ("num".equalsIgnoreCase(charOrNum)) { // 数字
				val += String.valueOf(random.nextInt(10));
			}
		}

		return val;
	}