校验日期格式{YYYYMMDD的 java代码

1. yyyy-MM-dd 格式校验

public class RegexpUtils {

    /**
     * 是否是 yyyy-MM-dd 日期格式 校验
     * @param date 日期
     * @return boolean
     */
    public static boolean isDateFormat(String date) {
        if (StringUtils.isBlank(date)) {
            return false;
        }
        String regexp = "[0-9]{4}-[0-9]{2}-[0-9]{2}";
        return Pattern.compile(regexp).matcher(date).matches();
    }

}

2. yyyy-MM-dd hh:mm:ss 格式校验

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class TimeUtil {
    /**
     * 验证时间字符串格式输入是否正确
     * @param timeStr
     * @return
     */
    public static boolean valiDateTimeWithLongFormat(String timeStr) {
        String format = "((19|20)[0-9]{2})-(0?[1-9]|1[012])-(0?[1-9]|[12][0-9]|3[01]) "
                + "([01]?[0-9]|2[0-3]):[0-5]?[0-9]:[0-5]?[0-9]";
        Pattern pattern = Pattern.compile(format);
        Matcher matcher = pattern.matcher(timeStr);
        if (matcher.matches()) {
            pattern = Pattern.compile("(\\d{4})-(\\d+)-(\\d+).*");
            matcher = pattern.matcher(timeStr);
            if (matcher.matches()) {
                int y = Integer.valueOf(matcher.group(1));
                int m = Integer.valueOf(matcher.group(2));
                int d = Integer.valueOf(matcher.group(3));
                if (d > 28) {
                    Calendar c = Calendar.getInstance();
                    c.set(y, m-1, 1);
                    int lastDay = c.getActualMaximum(Calendar.DAY_OF_MONTH);
                    return (lastDay >= d);
                }
            }
            return true;
        }
        return false;
    }
    
    public static void main(String[] args){
        System.out.println(TimeUtil.valiDateTimeWithLongFormat("2016-5-2 08:02:02"));
        System.out.println(TimeUtil.valiDateTimeWithLongFormat("2016-02-29 08:02:02"));
        System.out.println(TimeUtil.valiDateTimeWithLongFormat("2015-02-29 08:02:02"));
        System.out.println(TimeUtil.valiDateTimeWithLongFormat("2016-02-02 082:02"));
    }
}