Java 日历组件java.util.Calendar以及时间戳 java.sql.Timestamp

几年前有写过该类的工具类，但没有放到博客上。当然，要找关于该日历的使用，网上一搜就大把。but,我还是记录下，以后可以直接自己博客上拿来用。

日历:java.util.Calendar

import java.sql.Timestamp;
import java.util.Calendar;

public class TimeHandler {
    /**
     * 获得当前年份
     * @return
     */
    public static int getYear(){
        return Calendar.getInstance().get(Calendar.YEAR);
    }
    /**
        * 计算指定日期为当年第几周
        * @param year       指定的年份
        * @param month      指定的月份
        * @param day        指定的日
        * @return           指定日期为当年的第几周
        */ 
       public static int caculateWeekOfYear(int year,int month,int day){ 
        Calendar c = Calendar.getInstance(); 
        c.set(Calendar.YEAR, year); 
        c.set(Calendar.MONTH, month - 1); 
        c.set(Calendar.DATE, day); 
        return c.get(Calendar.WEEK_OF_YEAR); 
       } 
        
       /**
        * 获取本月第一天是星期几
        * @return
        */ 
       public static int getWeekOfFirstDay(Calendar c){ 
        Calendar calendar = c; 
        calendar.set(Calendar.DAY_OF_MONTH, 1); 
        return calendar.get(Calendar.DAY_OF_WEEK); 
       } 
        
       /**
        * 获取本月1号是该年的第几周
        * @return
        */ 
       public static int getMonthStartWeek(Calendar c){ 
        Calendar calendar = c; 
        calendar.set(Calendar.DATE, 1); 
        return calendar.get(Calendar.WEEK_OF_YEAR); 
       } 
        
       /**
        * 获取当天是该年的第几周
        */ 
       public static int getCurrentWeekOfYear(){ 
        Calendar calendar = Calendar.getInstance(); 
        return calendar.get(Calendar.WEEK_OF_YEAR); 
       } 
        
       /**
        * 获取上月的总天数
        * @return
        */ 
       public static int getLastMonthDays(Calendar c){ 
        Calendar calendar = c; 
        calendar.set(Calendar.MONTH, calendar.get(Calendar.MONTH) - 1); 
        return calendar.getActualMaximum(Calendar.DAY_OF_MONTH); 
       } 
        
       /**
        * 获取指定月份的总天数
        * @return
        */ 
       public static int getCurrentMonthDays(int month){ 
        Calendar c = Calendar.getInstance(); 
        c.set(Calendar.MONTH, month - 1); 
        return c.getActualMaximum(Calendar.DAY_OF_MONTH); 
       } 
        
       /**
        * 获取指定年份有多少周
        * @param year
        * @return
        */ 
       public static int getTotalWeekOfYear(int year){ 
        Calendar c = Calendar.getInstance(); 
        return c.getActualMaximum(Calendar.WEEK_OF_YEAR); 
       } 
        
       /**
        * 判断指定月份是否是当前月
        * @param month
        * @return
        */ 
       public static boolean isCurrentMonth(int month){ 
        Calendar c = Calendar.getInstance(); 
        return (c.get(Calendar.MONTH) == month - 1)?true:false; 
    } 
        
       /**
        * 计算指定的月份共有多少天
        */ 
       public static int getTotalDaysOfMonth(int year, int month){ 
        Calendar c = Calendar.getInstance(); 
        c.set(Calendar.YEAR, year); 
        c.set(Calendar.MONTH, month-1); 
        c.set(Calendar.DATE, 1); 
        /**
         * 计算这个月有多少天
         */ 
        return c.getActualMaximum(Calendar.DAY_OF_MONTH); 
       } 

       /**
        * 指定日期零点(一天的开始)来获取毫秒数
        * @param year
        * @param month
        * @param day
        * @return
        */
       public static long getStartTimeByDay(int year, int month, int day){
           Calendar calendar = Calendar.getInstance();
           calendar.set(Calendar.YEAR, year);
           calendar.set(Calendar.DAY_OF_MONTH, day);
           calendar.set(Calendar.MONTH, month - 1);
           calendar.set(Calendar.HOUR_OF_DAY, 0);
           calendar.set(Calendar.MINUTE, 0);
           calendar.set(Calendar.SECOND, 0);
           return  calendar.getTimeInMillis();
       }
       
       /**
        * 获取year对应的今天的零点时的毫秒数
        * @param year
        * @return
        */
       public static long getOtherYearInTodayMinTime(int year){
           Calendar calendar = Calendar.getInstance();
           calendar.set(Calendar.YEAR, year);
           calendar.set(Calendar.HOUR_OF_DAY, 0);
           calendar.set(Calendar.MINUTE, 0);
           calendar.set(Calendar.SECOND, 0);
           long time = calendar.getTimeInMillis();
           return time;
       }
       
       /**
        * 获取year对应的今天23:59:59(一天的结束)来获取毫秒数
        * @param year
        * @return
        */
       public static long getOtherYearInTodayMaxTime(int year){
           Calendar calendar = Calendar.getInstance();
           calendar.set(Calendar.YEAR, year);
           calendar.set(Calendar.HOUR_OF_DAY, 23);
           calendar.set(Calendar.MINUTE, 59);
           calendar.set(Calendar.SECOND, 59);
           return calendar.getTimeInMillis();
       }
       
       /**
        * 根据时间获取对应的日历时间
        * @param time
        * @return
        */
       public static Calendar getCalendar(long time){
           Calendar calendar = Calendar.getInstance();
           calendar.setTimeInMillis(time);
           return calendar;
       }
       /**
        * 根据指定日历查找年份
        * @param calendar
        * @return
        */
       public static int getYearByCalendar(Calendar calendar){
           return calendar.get(Calendar.YEAR);
       }
       /**
        * 根据指定日历及年份修改日历年份后的对应的时间(毫秒)
        * @param calendar
        * @param year
        * @return
        */
       public static long getTimeByCalendarNewYear(Calendar calendar, int year){
           calendar.set(Calendar.YEAR, year);
           return calendar.getTimeInMillis();
       }
       /**
        * 根据指定日历及增减年数修改日历年份后的对应的时间(毫秒)
        * @param calendar
        * @param v
        * @return
        */
       public static long getTimeByCalendarAddYearsAfter(Calendar calendar,int v ){
           calendar.set(Calendar.YEAR, calendar.get(Calendar.YEAR) + v);
           return calendar.getTimeInMillis();
       }
       /**
        * 
        * @param calendar
        * @return
        */
       public static long getTimeByCalendar(Calendar calendar){
           return calendar.getTimeInMillis();
       }
       
       /**
        * 获取当前所在的月份
        * @return
        */
       public static int getCurrentMonth(){
           Calendar calendar = Calendar.getInstance();
           return calendar.get(Calendar.MONTH) + 1;
       }
       
       /**
        * 指定日期23:59:59(一天的结束)来获取毫秒数
        * @param year
        * @param month
        * @param day
        * @return
        */
       public static long getEndTimeByDay(int year, int month, int day){
           Calendar calendar = Calendar.getInstance();
           calendar.set(Calendar.YEAR, year);
           calendar.set(Calendar.DAY_OF_MONTH, day);
           calendar.set(Calendar.MONTH, month - 1);
           calendar.set(Calendar.HOUR_OF_DAY, 23);
           calendar.set(Calendar.MINUTE, 59);
           calendar.set(Calendar.SECOND, 59);
           long time = calendar.getTimeInMillis();
           return time;
       }
       
       /**
        * 获取今天0点的毫秒数
        * @return
        */
       public static long getTime(){
           Calendar calendar = Calendar.getInstance();
           calendar.set(Calendar.HOUR_OF_DAY, 0);
           calendar.set(Calendar.MINUTE, 0);
           calendar.set(Calendar.SECOND, 0);
           long time = calendar.getTimeInMillis();
           return time;
       }
       
       /**
        * 获取当前天为几号
        * @return
        */
       public static int getCurrentDay(){
           Calendar calendar = Calendar.getInstance();
           return calendar.get(Calendar.DAY_OF_MONTH);
       }
       
       /**
        * 获取当前日期:yyyy-mm-dd
        * @return
        */
       public static String getDate(){
           Calendar calendar = Calendar.getInstance();
           int year = calendar.get(Calendar.YEAR);
           int month = calendar.get(Calendar.MONTH) + 1;
           int day = calendar.get(Calendar.DAY_OF_MONTH);
           String date = "" + year + "-" + (month >= 10?month:"0"+month) + "-" + (day >= 10?day:"0"+day);
           return date;
       }
       

       /**
        * 获取指定日历下的日期:yyyy-mm-dd
        * @return
        */
       public static String getDate(Calendar calendar){
           int year = calendar.get(Calendar.YEAR);
           int month = calendar.get(Calendar.MONTH) + 1;
           int day = calendar.get(Calendar.DAY_OF_MONTH);
           String date = "" + year + "-" + (month >= 10?month:"0"+month) + "-" + (day >= 10?day:"0"+day);
           return date;
       }
       
       /**
        * 获取指定时间对应的日期:yyyy-mm-dd
        * @return
        */
       public static String getDate(long time){
           Calendar calendar = Calendar.getInstance();
           calendar.setTimeInMillis(time);
           int year = calendar.get(Calendar.YEAR);
           int month = calendar.get(Calendar.MONTH) + 1;
           int day = calendar.get(Calendar.DAY_OF_MONTH);
           String date = "" + year + "-" + (month >= 10?month:"0"+month) + "-" + (day >= 10?day:"0"+day);
           return date;
       }
       
}

时间戳: java.sql.Timestamp

import java.sql.Timestamp;
import java.text.SimpleDateFormat;
import java.util.TimeZone;
import java.util.Date;

public class TimestampUtil {

    private static SimpleDateFormat tsdf = null ;  //timestamp date formatter
    private static SimpleDateFormat dtdf  = null ; //date time date formatter
    private static SimpleDateFormat tsdp = null ;  //timestamp date parser
    private static SimpleDateFormat dtdp  = null ; //date time date parser
    private static SimpleDateFormat tp_dt = null;//日期时间格式 yyyy-MM-dd HH:mm:ss
   
    private static void init(){        
        if( null == dtdp ){
            
//          TimeZone utcTz= TimeZone.getTimeZone("GMT+0:00");
            TimeZone cnTz = TimeZone.getTimeZone("GMT+8:00");
            
            tsdf = new SimpleDateFormat("yyyyMMddHHmmss");
            tsdf.setTimeZone(cnTz);
            dtdf = new SimpleDateFormat("yyyyMMdd");
            dtdf.setTimeZone(cnTz);
            
            tsdp = new SimpleDateFormat("yyyyMMddHHmmss");
//          tsdp.setTimeZone(utcTz);
            tsdp.setTimeZone(cnTz);
            dtdp = new SimpleDateFormat("yyyyMMdd");
//          dtdp.setTimeZone(utcTz);
            dtdp.setTimeZone(cnTz);
            
            tp_dt = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
            tp_dt.setTimeZone(cnTz);
        }        
    }

    public static String toTimestamp(Timestamp ts) {
        init();
        return tsdf.format(ts);
    }

    public static String toTimestamp(Date ts) {
        init();
        return tsdf.format(ts);
    }

    public static String toDateStr(Timestamp ts) {
        init();
        return dtdf.format(ts);
    }

    public static String toDateStr(Date ts) {
        init();
        return dtdf.format(ts);
    }

  //String2Timestamp: 
    public static Timestamp parse(String str){
        init();

        if( null == str || 8 > str.length()){
            return null ; 
        }
        
        if( 14 < str.length() ){
            str = str.substring(0,14);
        }
        int size = str.length();
        for( int i = 0 ;i< size;++i){
            char ch = str.charAt(i);
            if( ch <'0' || ch >'9' ){
                return null;
            }
        }
        
        Date ret = null ;         
        if( 8 == str.length()){
            try{
                ret = dtdp.parse(str);
            }
            catch(Exception ex){
                ret = null;
            }
            
            return new Timestamp( ret.getTime());
        }
        
        if( 14 > size) {
            for( int i = size ;i<14; i++){
                str += "0";
            }
        }
        
        try{
            ret = tsdp.parse(str);
        }
        catch(Exception ex){
            ret = null;
        }
        
        return new Timestamp( ret.getTime());
    }    
    
    /**
     * 当前年月日-yyyyMMdd
     * @return
     */
    public static String getTimeIsDate(){
        init();
        return dtdp.format(System.currentTimeMillis());
    }
    /**
     * 当前年月日-yyyyMMdd HH:mm:ss
     * @return
     */
    public static String getTimeInDateTime(){
        init();
        return tp_dt.format(System.currentTimeMillis());
    }
    /**
     * 获取当前的时间戳yyyy-MM-dd HH:mm:ss
     * @return
     */
    public static Timestamp getTimestampByCurrentTime(){
        return new Timestamp(System.currentTimeMillis());
    }
    /**
     * 根据time获取时间戳yyyy-MM-dd HH:mm:ss
     * @param time
     * @return
     */
    public static Timestamp getTimestampByTimeMillis(long time){
        return new Timestamp(time);
    }
    /**
     * 获取当前的时间yyyyMMddHHmmss
     * @return
     */
    public static String getTimeInTime(){
        return new SimpleDateFormat("yyyyMMddHHmmss").format(new Date(System.currentTimeMillis())).toString();
    }
    
}