常用时间工具类

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import java.sql.Timestamp;import java.text.DateFormat;import java.text.ParseException;import java.text.SimpleDateFormat;import java.util.Calendar;import java.util.Date;public class DateUtil {    public static String datePattern = "MM/dd/yyyy";    public static String timePattern = "HH:mm";    public static String datePatternCommon = "yyyy-MM-dd";    public static String datePatternAll = "yyyy-MM-dd HH:mm";    /*******yyyy-MM-dd HH:mm:sss*********/    public static String datePatternWithSecond = "yyyy-MM-dd HH:mm:ss";    /*******yyyyMMddHHmmss*********/    public static String datePatternWithSecond1 = "yyyyMMddHHmmss";    public static String hourPattern = "HH";    public static String minutePattern = "mm";    /**     * 获取当前日期时间（格式化到秒）     * @return     */     public static String getDateTime(){             String datestr="";            SimpleDateFormat df=new SimpleDateFormat(datePatternWithSecond);            java.util.Date date = new java.util.Date();            datestr=df.format(date);            return datestr;        }     /**      * 格式化时间（时分秒）      * @return      */        public static String getTime(){             String datestr = "";            DateFormat df=new SimpleDateFormat("HH:mm:ss");            java.util.Date date = new java.util.Date();            datestr=df.format(date);            return datestr;        }        /**         * 获取当前年份         * @return         */        public static String getYear(){            String datestr = "";            DateFormat df=new SimpleDateFormat("yyyy");            java.util.Date date = new java.util.Date();            datestr=df.format(date);            return datestr;        }        /**         * 获取当前月份         * @return         */        public static String getMonth(){            String datestr = "";            DateFormat df=new SimpleDateFormat("MM");            java.util.Date date = new java.util.Date();            datestr=df.format(date);            return datestr;        }        /**         * 获取在当前月中的天数         * @return         */        public static String getDay(){            String datestr = "";            DateFormat df=new SimpleDateFormat("dd");            java.util.Date date = new java.util.Date();            datestr=df.format(date);            return datestr;        }        /**         * 获取当前小时数         * @return         */        public static String getHour(){            String datestr = "";            DateFormat df=new SimpleDateFormat("HH");            java.util.Date date = new java.util.Date();            datestr=df.format(date);            return datestr;        }        /**         * 获取当前分钟数         * @return         */        public static String getMinute(){            String datestr = "";            DateFormat df=new SimpleDateFormat("mm");            java.util.Date date = new java.util.Date();            datestr=df.format(date);            return datestr;        }        /**         * 获取当前日期         * @return         */        public static String getDate(){             String datestr="";            DateFormat df=new SimpleDateFormat(datePatternCommon);            java.util.Date date = new java.util.Date();            datestr=df.format(date);            return datestr;        }        /**         * 获取当前日期精确到分钟         * @return         */        public static String getDateShortTime(){            String datestr="";            DateFormat df=new SimpleDateFormat(datePatternAll);            java.util.Date date = new java.util.Date();            datestr=df.format(date);            return datestr;        }        /**         * 获取当前时间精确到秒         * @return         */        public static String getDateTimeName(){            String datestr="";            DateFormat df=new SimpleDateFormat(datePatternWithSecond);            java.util.Date date = new java.util.Date();            datestr=df.format(date);            return datestr;        }    public static Date formatDateByString(String strDate) {        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");        Date date = null;        try {            date = sdf.parse(strDate);        } catch (ParseException e) {            e.printStackTrace();        }        return date;    }    public static Date formatDateByString4(String strDate) {        SimpleDateFormat sdf = new SimpleDateFormat(datePatternAll);        Date date = null;        try {            date = sdf.parse(strDate);        } catch (ParseException e) {            e.printStackTrace();        }        return date;    }    public static Date formatDateByString2(String strDate) {        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");        Date date = null;        try {            date = sdf.parse(strDate);        } catch (ParseException e) {            e.printStackTrace();        }        return date;    }    public static Date formatDateByString(String strDate, String format) {        SimpleDateFormat sdf = new SimpleDateFormat(format);        Date date = null;        try {            date = sdf.parse(strDate);        } catch (ParseException e) {            e.printStackTrace();        }        return date;    }    public static String formatStringByDate(Date date) {        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");        String strDate = sdf.format(date);        return strDate;    }    public static String formatStringByDate(Date date, String format) {        SimpleDateFormat sdf = new SimpleDateFormat(format);        String strDate = sdf.format(date);        return strDate;    }    public static String formatStringByString(String date) {        String newDate = "";        Date d = formatDateByString(date);        newDate = formatStringByDate(d, "yyyyMMddHHmm");        return newDate;    }    public static String formatStringByString(String date, String pattern) {        String newDate = "";        Date d = formatDateByString(date);        newDate = formatStringByDate(d, pattern);        return newDate;    }    public static long getDateLong(String date) {        Date d = formatDateByString(date, "yyyy-MM-dd HH:mm:ss");        return d.getTime();    }    public static String getStringByLong(long date) {        Date d = new Date(date);        String sDate = formatStringByDate(d, "yyyy-MM-dd HH:mm:ss");        return sDate;    }    public static Date getDateByDate(Date date) {        String sDate = formatStringByDate(date, "yyyy-MM-dd HH:mm:ss");        Date sf = formatDateByString(sDate);        return sf;    }    public static String getDayweek(Date date) {        String[] weeks = { "星期日", "星期一", "星期二", "星期三", "星期四", "星期五", "星期六" };        Calendar cal = Calendar.getInstance();        cal.setTime(date);        int dayinweek = cal.get(Calendar.DAY_OF_WEEK) - 1;        return weeks[dayinweek];    }    public static Date getWeekStart(Date date) {        Calendar cal = Calendar.getInstance();        cal.setTime(date);        int day = cal.get(Calendar.DAY_OF_WEEK) - 1;        cal.add(Calendar.DATE, -day + 1);        return cal.getTime();    }    public static Date getWeekEnd(Date date) {        Calendar cal = Calendar.getInstance();        cal.setTime(date);        int day = cal.get(Calendar.DAY_OF_WEEK) - 1;        cal.add(Calendar.DATE, 6 - day + 1);        return cal.getTime();    }    /**     * 将指定的日期字符串按照指定的样式格式化成相应的日期型数据     *      * @param strDate     *            日期字符串     * @param strPattern     *            格式化样式     * @return 日期型数据实例或null[格式化错误]     */    public static boolean validate(String strDate, String strPattern)            throws Exception {        if (strDate == null || "".equals(strDate)) {            // throw new Exception("日期字符串为空：");            return false;        }        if (strPattern == null || "".equals(strPattern)) {            // throw new Exception("日期字符串的格式为空");            return false;        }        if (datePatternCommon.equals(strPattern)) {            if (!strDate.matches("^\\d{4}\\-\\d{2}\\-\\d{2}$")) {                // throw new Exception("日期字符串的格式与样式不符");                return false;            }        } else if (datePatternAll.equals(strPattern)) {            if (!strDate                    .matches("^\\d{4}\\-\\d{2}\\-\\d{2}\\s\\d{2}\\:\\d{2}$")) {                // throw new Exception("日期字符串的格式与样式不符");                return false;            }        }        SimpleDateFormat format = new SimpleDateFormat(strPattern);        format.setLenient(false);        try {            if (format.parse(strDate) != null)                return true;            else                return false;        } catch (ParseException e) {            // throw new Exception("日期字符串格式化失败");            return false;        }    }    /**     * 将String转换成TimeStamp     * @param datetime     * @return     */    public static Timestamp  getStringToTimestamp(String  datetime){        Timestamp ts = new Timestamp(System.currentTimeMillis());           try {               ts = Timestamp.valueOf(datetime);           } catch (Exception e) {               e.printStackTrace();           }         return ts;     }    public static Timestamp formatStringDate(String date){          String [] str = date.split(",");          StringBuffer str1=new StringBuffer();          for(int i=0;i<str.length;i++){              if(str[i].length()==1){                  str[i]="0"+str[i];              }              str1.append(str[i]+"-");          }          String str2=str1.substring(0, str1.length()-1);          str2=str2+" 00:00:00";          return Timestamp.valueOf(str2.toString());      }    public static Timestamp getTimeStampTime(){        Date date = new Date();               Timestamp nousedate = new Timestamp(date.getTime());        return nousedate;    }}
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