자바 주민등록번호 검증

/**
	 *        
	 * 
	 * @param papersNumber
	 *                 
	 */
	public static boolean checkPapersNumber(String papersNumber) {
		if (StringUtils.isBlank(papersNumber)) {
			return false;
		} else if (papersNumber.length() < 15) {
			return false;
		}
		String dt = papersNumber.substring(6, 14);
		if (!checkDate(dt, "yyyyMMdd")) {
			return false;
		}
		// 18        
		if (papersNumber.length() == 18) {
			int a, b, c = 0;
			String d = "";
			if (!checkNumber(papersNumber.substring(0, 17))) {
				return false;
			}
			a = Integer.parseInt(papersNumber.substring(0, 1)) * 7 
                            + Integer.parseInt(papersNumber.substring(1, 2)) * 9 
                            + Integer.parseInt(papersNumber.substring(2, 3)) * 10;
			a = a + Integer.parseInt(papersNumber.substring(3, 4)) * 5 
                            + Integer.parseInt(papersNumber.substring(4, 5)) * 8 
                            + Integer.parseInt(papersNumber.substring(5, 6)) * 4;
			a = a + Integer.parseInt(papersNumber.substring(6, 7)) * 2 
                            + Integer.parseInt(papersNumber.substring(7, 8)) * 1 
                            + Integer.parseInt(papersNumber.substring(8, 9)) * 6;
			a = a + Integer.parseInt(papersNumber.substring(9, 10)) * 3 
                            + Integer.parseInt(papersNumber.substring(10, 11)) * 7 
                            + Integer.parseInt(papersNumber.substring(11, 12)) * 9;
			a = a + Integer.parseInt(papersNumber.substring(12, 13)) * 10 
                            + Integer.parseInt(papersNumber.substring(13, 14)) * 5 
                            + Integer.parseInt(papersNumber.substring(14, 15)) * 8;
			a = a + Integer.parseInt(papersNumber.substring(15, 16)) * 4 
                            + Integer.parseInt(papersNumber.substring(16, 17)) * 2;
			b = a % 11;
			if (b == 2) //         
			{
				d = papersNumber.substring(17, 18).toUpperCase(); 
                                //     X
			} else {
				c = Integer.parseInt(papersNumber.substring(17, 18));
			}

			String JYM = "10X98765432";
			String m = JYM.substring(b, b + 1);
			if ("X".equals(m)) {
				if (!"X".equals(d)) {
					//System.out.println("         :       :X");
					return false;
				}
			} else {
				if (c != Integer.parseInt(m)) {
					//System.out.println("          :       :" + m);
					return false;
				}
			}
		} else {
			// 15     
			if (!checkNumber(papersNumber)) {
				//System.out.println("       , 15         ！");
				return false;
			}
		}
		return true;
	}

	/**
	 *       
	 * 
	 * @param date
	 *                 
	 * @param format
	 *                 
	 * @return
	 */
	public static boolean checkDate(String date, String format) {
		SimpleDateFormat sdf = new SimpleDateFormat(format);
		try {
			sdf.parse(date);
		} catch (ParseException e) {
			return false;
		}
		return true;
	}

	/**
	 *       
	 * 
	 * @param num
	 * @return
	 */
	public static boolean checkNumber(String num) {
		String regex = "^\\d+$";
		Pattern patten = Pattern.compile(regex);
		Matcher m = patten.matcher(num);
		boolean b = m.matches();
		if (b) {
			return true;
		}
		return false;
	}