DateFormatUtil

import java.text.ParseException;
import java.util.Date;
 
import javax.validation.constraints.NotNull;
 
import org.apache.commons.lang3.StringUtils;
import org.apache.commons.lang3.time.FastDateFormat;
 
public class DateFormatUtil {
 
    public static final String DATE_REGEX_YYYYMM = "^\\d{4}-\\d{1,2}$";//日期正则yyyy-MM
    public static final String DATE_REGEX_YYYYMMDD = "^\\d{4}-\\d{1,2}-\\d{1,2}$";//日期正则yyyy-MM-dd
    public static final String DATE_REGEX_YYYYMMDDHHMM = "^\\d{4}-\\d{1,2}-\\d{1,2} {1}\\d{1,2}:\\d{1,2}$";//日期正则yyyy-MM-dd hh:mm
    public static final String DATE_REGEX_YYYYMMDDHHMMSS = "^\\d{4}-\\d{1,2}-\\d{1,2} {1}\\d{1,2}:\\d{1,2}:\\d{1,2}$";//日期正则yyyy-MM-dd hh:mm:ss
 
 
    public static final String PATTERN_ISO_ON_DATE = "yyyy-MM-dd";
    public static final String PATTERN_ISO_ON_MONTH = "yyyy-MM";
 
    public static final String PATTERN_DEFAULT_ON_SECOND = "yyyy-MM-dd HH:mm:ss";
    public static final String PATTERN_DEFAULT_ON_MINUTE = "yyyy-MM-dd HH:mm";
 
 
    public static final FastDateFormat ISO_ON_DATE_FORMAT = FastDateFormat.getInstance(PATTERN_ISO_ON_DATE);
    public static final FastDateFormat ISO_ON_MONTH_FORMAT = FastDateFormat.getInstance(PATTERN_ISO_ON_MONTH);
 
    public static final FastDateFormat DEFAULT_ON_SECOND_FORMAT = FastDateFormat.getInstance(PATTERN_DEFAULT_ON_SECOND);
    public static final FastDateFormat DEFAULT_ON_MINUTE_FORMAT = FastDateFormat.getInstance(PATTERN_DEFAULT_ON_MINUTE);
 
    public static Date pareDate(@NotNull String dateString) throws ParseException {
        String source = dateString.trim();
        if (StringUtils.isNotBlank(source)) {
            if(source.matches(DATE_REGEX_YYYYMM)){
                return ISO_ON_MONTH_FORMAT.parse(source);
            }else if(source.matches(DATE_REGEX_YYYYMMDD)){
                return ISO_ON_DATE_FORMAT.parse(source);
            }else if(source.matches(DATE_REGEX_YYYYMMDDHHMM)){
                return DEFAULT_ON_MINUTE_FORMAT.parse(source);
            }else if(source.matches(DATE_REGEX_YYYYMMDDHHMMSS)){
                return DEFAULT_ON_SECOND_FORMAT.parse(source);
            }else {
                throw new IllegalArgumentException("Invalid date value '" + source + "'");
            }
        }
        return null;
    }
 
}