java日期工具类

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import java.text.SimpleDateFormat;import java.util.Calendar;import java.util.Date;import java.util.GregorianCalendar;import org.apache.commons.httpclient.util.DateUtil;import com.zgxcw.framework.util.Assert;/** * @Title: DateUtils * @Description: 日期相关工具类 */public final class DateUtils {  // 短日期格式  public static String DATE_FORMAT = "yyyy-MM-dd";  // 长日期格式  public static String TIME_FORMAT = "yyyy-MM-dd HH:mm:ss";  /**   * 将数字转成日期字符串   *    * @param num   * @return   */  public static String num2Date(Long num) {    if (null == num || num == 0) {      return "";    }    SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");    String dateStr = df.format(new Date(num));    return dateStr;  }  /**   * 获取当天0点的毫秒数   *    * @return   */  public static long todayStartMillis() {    Calendar cal = Calendar.getInstance();    cal.set(Calendar.HOUR_OF_DAY, 0);    cal.set(Calendar.SECOND, 0);    cal.set(Calendar.MINUTE, 0);    cal.set(Calendar.MILLISECOND, 0);    return (cal.getTimeInMillis());  }  /**   * 获取当天24点的毫秒数   *    * @return   */  public static long todayEndMillis() {    Calendar cal = Calendar.getInstance();    cal.set(Calendar.HOUR_OF_DAY, 24);    cal.set(Calendar.SECOND, 0);    cal.set(Calendar.MINUTE, 0);    cal.set(Calendar.MILLISECOND, 0);    return (cal.getTimeInMillis());  }  /**   * 获取当月0点的毫秒数   *    * @return   */  public static long monthStartMillis() {    Calendar cal = Calendar.getInstance();    cal.set(cal.get(Calendar.YEAR), cal.get(Calendar.MONDAY), cal.get(Calendar.DAY_OF_MONTH), 0, 0,        0);    cal.set(Calendar.DAY_OF_MONTH, cal.getActualMinimum(Calendar.DAY_OF_MONTH));    return (cal.getTimeInMillis());  }  /**   * 获取当月24点的毫秒数   *    * @return   */  public static long monthEndMillis() {    Calendar cal = Calendar.getInstance();    cal.set(cal.get(Calendar.YEAR), cal.get(Calendar.MONDAY), cal.get(Calendar.DAY_OF_MONTH), 0, 0,        0);    cal.set(Calendar.DAY_OF_MONTH, cal.getActualMaximum(Calendar.DAY_OF_MONTH));    cal.set(Calendar.HOUR_OF_DAY, 24);    return (cal.getTimeInMillis());  }  /**   * 30天前0点毫秒数   *    * @return   */  public static long before30DayStartMillis() {    return DateUtils.todayEndMillis() - (86400000l * 30);  }  /**   * 获取时间的毫秒数   *    * @param date   * @param format   * @return   */  public static long convert2long(String date, String format) {    try {      if (!Assert.isNull(date)) {        if (Assert.isNull(format)) {          format = DateUtils.TIME_FORMAT;        }        SimpleDateFormat sf = new SimpleDateFormat(format);        return sf.parse(date).getTime();      }    } catch (Exception e) {      e.printStackTrace();    }    return 0l;  }  /**   * 返回两个日期相差的天数   *    * @param startDate 开始日期   * @param endDate 结束日期   * @return 相差天数   */  public static int getDateSpace(Long startDate, Long endDate) {    Calendar calst = Calendar.getInstance();;    Calendar caled = Calendar.getInstance();    calst.setTimeInMillis(startDate);    caled.setTimeInMillis(endDate);    // 设置时间为0时    calst.set(Calendar.HOUR_OF_DAY, 0);    calst.set(Calendar.MINUTE, 0);    calst.set(Calendar.SECOND, 0);    caled.set(Calendar.HOUR_OF_DAY, 0);    caled.set(Calendar.MINUTE, 0);    caled.set(Calendar.SECOND, 0);    // 得到两个日期相差的天数    int days =        ((int) (caled.getTime().getTime() / 1000) - (int) (calst.getTime().getTime() / 1000)) / 3600 / 24;    return days;  }  /**   * 将毫秒数转成 几天几小时几分几秒   *    * @param mss   * @return   */  public static String formatDuring(long mss) {    long days = mss / (1000 * 60 * 60 * 24);    long hours = (mss % (1000 * 60 * 60 * 24)) / (1000 * 60 * 60);    long minutes = (mss % (1000 * 60 * 60)) / (1000 * 60);    long seconds = (mss % (1000 * 60)) / 1000;    return days + " 天 " + hours + " 小时 " + minutes + " 分 " + seconds + " 秒 ";  }     /**   * @Description:日期格式转换Long型   * @return:Long   * @param:String   * @Date:2015-10-23 上午10:31:55   */  public static Long strToLong(String source) {  if (!Assert.isNull(source)) {  if (source.matches("^\\d{4}-\\d{1,2}-\\d{1,2}$")) {  return DateUtils.convert2long(source, DateUtils.DATE_FORMAT);  }else if(source.matches("^\\d{4}-\\d{1,2}-\\d{1,2} {1}\\d{1,2}:\\d{1,2}:\\d{1,2}$")) {  return DateUtils.convert2long(source, DateUtils.TIME_FORMAT);  }  }  return null;  }     /**    * 获取时间指定格式的时间字符串    *    * @param format 需要显示字符串的指定格式   * @param date 时间   * @return   */  public static String getDateStrByFormat(String format,Date date){  SimpleDateFormat df = new SimpleDateFormat(format);  String dateStr = df.format(date);  return dateStr;  }       /**    * 获取yyyy-MM-dd HH:mm:ss格式的时间字符串    *    * @param date   * @return   */  public static String getFullAppointDateStr(Date date){  SimpleDateFormat df = new SimpleDateFormat(TIME_FORMAT);  String dateStr = df.format(date);  return dateStr;  }  /**   * 时间 加 某月   * @param dateTime   * @param month   * @return   */  public static Long addMonth(Long dateTime,int month){  GregorianCalendar gc=new GregorianCalendar();   gc.setTimeInMillis(dateTime);  gc.add(2,+3);  return gc.getTimeInMillis();  }  }
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