根据身份证号判断证件持有人的性别、年龄、生日。废话不多说，直接上代码。
public class IdentifyCard {private static final Integer[] ODD_NUMS = {1, 3, 5, 7, 9};private static final Integer[] EVEN_NUMS = {0, 2, 4, 6, 8};private static final ThreadLocal<SimpleDateFormat> DATE_FORMAT_THREAD_LOCAL =ThreadLocal.withInitial(() -> new SimpleDateFormat("yyyyMMdd"));/*** @param area地区码，如：110101* @param birthday 出生日期：20000101* @param sex性别：0=男；1=女* @param size最小1；最大500* @return results 生成结果集*/public static String[] generator(String area, Date birthday, int sex, int size) {SexEnum.checkSex(sex);checkSize(size);List<String> resultList = new ArrayList<>(size);String simpleBirthday = DATE_FORMAT_THREAD_LOCAL.get().format(birthday);Set<String> numbers = ordinalNumbers(sex, size);for (String seqNo : numbers) {String prefix = area + simpleBirthday + seqNo;String cardNo = prefix + getCheckCode(prefix);resultList.add(cardNo);}String[] results = resultList.toArray(new String[size]);new RandomSort<String>(results).changePosition();return results;}private static void checkSize(int size) {if (size < 1 || size > 500) {throw new IllegalArgumentException("The size min 1, max 500.");}}// prefix = area + birthdayFormat + seqNoprivate static String getCheckCode(String prefix) {int sum = 0;for (int i = 0; i < prefix.length(); i++) {DigitsEnum digitsEnum = DigitsEnum.get(i + 1);int seatVal = Integer.parseInt(prefix.substring(i, i + 1));sum = sum + seatVal * digitsEnum.getValue();}return CheckCode.get(sum);}// generated ordinal numbers by sex and size.private static Set<String> ordinalNumbers(int sex, int size) {Set<String> results = new HashSet<>();String[] sequenceArrays = sequenceArrays();Integer[] nums = SexEnum.getNums(sex);new RandomSort<Integer>(nums).changePosition();int count = 0;for (String sequence : sequenceArrays) {for (int sexNum : nums) {results.add(sequence + sexNum);count ++;if (count == size) {break;}}if (count == size) {break;}}return results;}// generated disorder sequence arrays.public static String[] sequenceArrays() {Set<String> resultSet = new HashSet<>();String[] numbers = sequenceNumbers();new RandomSort<String>(numbers).changePosition();for (String first : numbers) {for (String second : numbers) {resultSet.add(first + second);}}String[] array = resultSet.toArray(new String[]{});new RandomSort<String>(array).changePosition();return array;}// generated orderly sequence numbers.private static String[] sequenceNumbers() {String[] numbers = new String[10];for (int i = 0; i <= 9; i++) {numbers[i] = Integer.toString(i);}return numbers;}/*** sex enum*/private enum SexEnum {male(0, ODD_NUMS, "male"),female(1, EVEN_NUMS, "female");private int code;private Integer[] nums;private String desc;public static void checkSex(int sex) {for (SexEnum sexEnum : SexEnum.values()) {if (sexEnum.getCode() == sex) {return;}}throw new IllegalArgumentException("The sex 0:male 1:female.");}public static Integer[] getNums(int code) {for (SexEnum sexEnum : SexEnum.values()) {if (sexEnum.getCode() == code) {return sexEnum.getNums();}}throw new IllegalArgumentException("Sex code not match.");}SexEnum(int code, Integer[] nums, String desc) {this.code = code;this.nums = nums;this.desc = desc;}public int getCode() {return code;}public void setCode(int code) {this.code = code;}public Integer[] getNums() {return nums;}public void setNums(Integer[] nums) {this.nums = nums;}public String getDesc() {return desc;}public void setDesc(String desc) {this.desc = desc;}}/*** check code*/private enum CheckCode {zero(0, "1"),one(1, "0"),two(2, "X"),three(3, "9"),four(4, "8"),five(5, "7"),six(6, "6"),seven(7, "5"),eight(8, "4"),nine(9, "3"),ten(10, "2"),;/* remainder */private int remainder;private String code;public static String get(int sum) {int remainder = sum % 11;for (CheckCode checkCode : CheckCode.values()) {if (checkCode.getRemainder() == remainder) {return checkCode.getCode();}}throw new IllegalArgumentException("not found.");}CheckCode(int remainder, String code) {this.remainder = remainder;this.code = code;}public int getRemainder() {return remainder;}public void setRemainder(int remainder) {this.remainder = remainder;}public String getCode() {return code;}public void setCode(String code) {this.code = code;}}/*** digits factor*/private enum DigitsEnum {one(1, 7),two(2, 9),three(3, 10),four(4, 5),five(5, 8),six(6, 4),seven(7, 2),eight(8, 1),nine(9, 6),ten(10, 3),eleven(11, 7),twelve(12, 9),thirteen(13, 10),fourteen(14, 5),fifteen(15, 8),sixteen(16, 4),seventeen(17, 2),eighteen(18, -1);/* What's the number one. */private int seat;private int value;DigitsEnum(int seat, int value) {this.seat = seat;this.value = value;}public static DigitsEnum get(int seat) {if (seat < 0 || seat > 17) {throw new IllegalArgumentException("The seat value min 1, max 17.");}for (DigitsEnum digitsEnum : DigitsEnum.values()) {if (digitsEnum.getSeat() == seat) {return digitsEnum;}}throw new IllegalArgumentException("not found.");}public int getSeat() {return seat;}public void setSeat(int seat) {this.seat = seat;}public int getValue() {return value;}public void setValue(int value) {this.value = value;}}private static class RandomSort<T> {private final Random random = new Random();private final T[] positions;private final int SIZE;public RandomSort(T[] positions) {this.positions = positions;this.SIZE = positions.length;}public void changePosition() {for (int index = SIZE - 1; index >= 0; index--) {exchange(random.nextInt(index + 1), index);}}private void exchange(int p1, int p2) {T temp = positions[p1];positions[p1] = positions[p2];positions[p2] = temp;}}}
