DateUtil时间工具类

import java.math.BigDecimal;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
import java.util.Objects;
import java.util.regex.Matcher;
import java.util.regex.Pattern;


/**
 * @Description:DateUtil 提供一些常用的时间想法的方法
 */
public final class DateUtil {

    //日期时间类型格式
    private static final String DATETIME_FORMAT = "yyyy-MM-dd HH:mm:ss";

    //日期时间类型格式
    private static final String DATEHOUR_FORMAT = "yyyy-MM-dd HH:mm";

    //日期类型格式
    private static final String DATE_FORMAT = "yyyy-MM-dd";

    //时间类型的格式
    private static final String TIME_FORMAT = "HH:mm:ss";
    
    //时间类型的格式(小时/分)
    private static final String TIME_FORMAT_HOUR = "HH:mm";

    //注意SimpleDateFormat不是线程安全的
    private static ThreadLocal<SimpleDateFormat> ThreadDateTime = new ThreadLocal<SimpleDateFormat>();
    private static ThreadLocal<SimpleDateFormat> ThreadDate = new ThreadLocal<SimpleDateFormat>();
    private static ThreadLocal<SimpleDateFormat> ThreadTime = new ThreadLocal<SimpleDateFormat>();
    private static ThreadLocal<SimpleDateFormat> ThreadHourTime = new ThreadLocal<SimpleDateFormat>();
    private static ThreadLocal<SimpleDateFormat> ThreadDateHour = new ThreadLocal<SimpleDateFormat>();
    
   /**
     * 时间date1和date2的时间差-单位分钟
     *
     * @param date1
     * @param date2
     * @return 分钟
     */
    public  static int subtractMinute(Date date1, Date date2) {
        long cha = date2.getTime() - date1.getTime();
        return (int) (cha / (1000 * 60));
    }
    /**
     * 讲指定的时间格式化成出返回
     *
     * @param date
     * @return
     */
    public  static String timeHour(Date date) {
        return TimeHourInstance().format(date);
    }
    private static SimpleDateFormat TimeHourInstance() {
        SimpleDateFormat df = ThreadHourTime.get();
        if (df == null) {
            df = new SimpleDateFormat(TIME_FORMAT_HOUR);
            ThreadHourTime.set(df);
        }
        return df;
    }
   /**
     * 将指定的字符串解析为时间类型
     *
     * @param dateStr
     * @return
     * @throws ParseException
     */
    public  static Date timeHour(String dateStr) throws ParseException {
        return TimeHourInstance().parse(dateStr);
    }
}