package com.cn.util;

import java.text.SimpleDateFormat;
import java.util.Arrays;
import java.util.Calendar;
import java.util.Date;
import java.util.regex.Pattern;

public class IDCardUtils {
// 正则格式
private static Pattern pattern = Pattern.compile("^\d{17}[\d|X]$");

/**
 * 省、直辖市代码表，身份证号的前6位为地址信息，我们只验证前两位
 */
private static final String CITY_CODE[] = { "11", "12", "13", "14", "15", "21", "22", "23", "31", "32", "33", "34",
		"35", "36", "37", "41", "42", "43", "44", "45", "46", "50", "51", "52", "53", "54", "61", "62", "63", "64",
		"65", "71", "81", "82", "91" };

/**
 * 每位加权因子
 */
private static final int POWER[] = { 7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2 };

/**
 * 第18位校检码
 **/
private static final String VERIFY_CODE[] = { "1", "0", "X", "9", "8", "7", "6", "5", "4", "3", "2" };

/**
 * 验证身份证
 * 
 * @param idno
 * @return
 */
public static boolean verify(String idno) {
	// 1.格式验证
	if (idno == null || !pattern.matcher(idno = idno.toUpperCase()).matches()) {
		return false;
	}

	// 2.验证省、直辖市代码。市、区不作验证，没有规则限制，数字即可
	if (Arrays.binarySearch(CITY_CODE, idno.substring(0, 2)) == -1) {
		return false;
	}

	// 3.验证生日,生日可能存在输入20180231这种情况，所以使用Calendar处理校验
	String birthday = idno.substring(6, 14);
	// 如果输入的日期为20180231，通过转换的后realBirthday为20180303
	Date realBirthday = toBirthDay(birthday);
	// 转换失败或不相等
	if (realBirthday == null || !birthday.equals(new SimpleDateFormat("yyyyMMdd").format(realBirthday))) {
		return false;
	}

	// 4.顺序码不作验证，没有规则限制，数字即可
	// 5.验证位验证，计算规则为：身份证前17位数字，对应乘以每位的权重因子，然后相加得到数值X，与11取模获得余数，得到数值Y,通过Y得到校验码。
	String verifyCode = VERIFY_CODE[getPowerSum(idno) % 11];
	if (!verifyCode.equals(idno.substring(17, 18))) {
		return false;
	}
	return true;
}

/**
 * 取得身份证号前17位与对应的权重值相乘的和
 * 
 * @return
 */
private static int getPowerSum(String idno) {
	int sum = 0;
	// 身份证前17位
	char[] fix17 = idno.substring(0, 17).toCharArray();
	for (int i = 0; i <= 16; i++) {
		sum += (Integer.parseInt(fix17[i] + "") * POWER[i]);
	}
	return sum;
}

/**
 * 转换成日期
 * 
 * @param birthday
 * @return
 */
private static Date toBirthDay(String birthday) {
	try {
		Calendar calendar = Calendar.getInstance();
		calendar.set(Calendar.YEAR, Integer.parseInt(birthday.substring(0, 4)));
		calendar.set(Calendar.MONTH, Integer.parseInt(birthday.substring(4, 6)) - 1);// 月份从0开始，所以减1
		calendar.set(Calendar.DAY_OF_MONTH, Integer.parseInt(birthday.substring(6, 8)));
		// 以下设置意义不大
		calendar.set(Calendar.HOUR_OF_DAY, 0);
		calendar.set(Calendar.MINUTE, 0);
		calendar.set(Calendar.SECOND, 0);
		calendar.set(Calendar.MILLISECOND, 0);

		return calendar.getTime();
	} catch (Exception e) {
		return null;
	}
}

/**
 * 从身份证号码中获取生日
 * 
 * @param idno
 * @return null表示idno错误，未获取到生日
 */
public static Date getBirthDay(String idno) {
	if (!verify(idno)) {
		return null;
	}

	return toBirthDay(idno.substring(6, 14));
}

/**
 * 从身份证号中获取性别
 * 
 * @param idno
 * @return 0:获取失败，1:男，2:女
 */
public static int getGender(String idno) {
	if (!verify(idno)) {
		return 0;
	}
	// 奇男，偶女
	return (Integer.parseInt(idno.substring(16, 17)) % 2) == 0 ? 1 : 0;
}

// public static void main(String[] args) {
// SimpleDateFormat SDF = new SimpleDateFormat(“yyyy-MM-dd”);
// Date a = getBirthDay(“23012720000325161X”);
// System.out.println(SDF.format(a));
// }
public static void main(String[] args) {
int a = getGender(“23012720000325161X”);
System.out.println(a);
}
}