import org.junit.jupiter.api.Test;

import java.io.IOException;
import java.util.regex.Pattern;

/**
 * Created by zengxc on 2018/1/30.
 */

public class DatePatternUtils {

    private Boolean checkDate(String dateStr) throws IOException {
        // 4种分隔符
        String sep = "[-\\./_]";
        // 年份
        String strPattern = "^(19[4-9]\\d|20\\d{2})";
        strPattern += "(";
        // 月（1,3,5,7,8,10,12)
        strPattern += "((0?[13578]|1[02])(0?[1-9]|[12][0-9]|3[01]))|";
        // 月(4,6,9,11)
        strPattern += "((0?[469]|11)(0?[1-9]|[12][0-9]|30))|";
        // 月（2）
        strPattern += "((0?[2]|11)(0?[1-9]|[12][0-9]|29))|";
        strPattern += ")$";
        System.out.println(strPattern);
        Pattern p = Pattern.compile(strPattern);
        return p.matcher(dateStr).matches();
    }

    /**
     * 正则校验时间格式尽量完善版 ,适用格式(yyyyMMdd),二月只能控制到29号，无法区分平年、闰年。
     * @param dateStr
     * @return
     */
    private Boolean checkDates(String dateStr){
        String datePattern = "^(19[4-9]\\d|20\\d{2})(((0?[13578]|1[02])(0?[1-9]|[12][0-9]|3[01]))" +
                            "|((0?[469]|11)(0?[1-9]|[12][0-9]|30))|((0?[2]|11)(0?[1-9]|[12][0-9]|29))|)$";
        Pattern pattern = Pattern.compile(datePattern);
        return pattern.matcher(dateStr).matches();
    }

    @Test
    public void test01() throws IOException {
        String dateStr = "20180229";

        Boolean bool = checkDates(dateStr);
        System.out.println(bool);
    }