验证身份证是否合法

package com.guohuai.mmp.investor.baseaccount.util;


import java.util.Calendar;

public class CardUtil {

	public static boolean vIDNumByRegex(String idNum) {

		String curYear = "" + Calendar.getInstance().get(Calendar.YEAR);
		int y3 = Integer.valueOf(curYear.substring(2, 3));
		int y4 = Integer.valueOf(curYear.substring(3, 4));
		// 43 0103 1973 0 9 30 051 9
		return idNum.matches("^(1[1-5]|2[1-3]|3[1-7]|4[1-6]|5[0-4]|6[1-5]|71|8[1-2])\\d{4}(19\\d{2}|20([0-" + (y3 - 1)
				+ "][0-9]|" + y3 + "[0-" + y4 + "]))(((0[1-9]|1[0-2])(0[1-9]|[1-2][0-9]|3[0-1])))\\d{3}([0-9]|x|X)$");
		// 44 1825 1988 0 7 1 3 003 4
	}

	private static int ID_LENGTH = 17;

	public static boolean vIDNumByCode(String idNum) {

		// 系数列表
		int[] ratioArr = { 7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2 };

		// 校验码列表
		char[] checkCodeList = { '1', '0', 'X', '9', '8', '7', '6', '5', '4', '3', '2' };

		// 获取身份证号字符数组
		char[] cIds = idNum.toCharArray();

		// 获取最后一位（身份证校验码）
		char oCode = cIds[ID_LENGTH];
		int[] iIds = new int[ID_LENGTH];
		int idSum = 0;// 身份证号第1-17位与系数之积的和
		int residue = 0;// 余数(用加出来和除以11，看余数是多少？)

		for (int i = 0; i < ID_LENGTH; i++) {
			iIds[i] = cIds[i] - '0';
			idSum += iIds[i] * ratioArr[i];
		}

		residue = idSum % 11;// 取得余数

		return Character.toUpperCase(oCode) == checkCodeList[residue];
	}

	public static boolean vId(String idNum) {
		return vIDNumByCode(idNum) && vIDNumByRegex(idNum);
	}

	public static void main(String[] args) {
		String idNum = "18位身份证号码";
        
		if(vId(idNum)){system.out.println("合法！")};
		if (Integer.parseInt(idNum.substring(16).substring(0, 1)) % 2 == 0) {// 判断性别
			System.out.println("女");
		} else {
			System.out.println("男");
		}
	}
}