java中常用的日期格式化

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import java.text.DateFormat;  
import java.text.ParseException;  
import java.text.SimpleDateFormat;  
import java.util.Calendar;  
import java.util.Date;  
/** 
 * 获取当前的日期格式为:yyyy-MM-dd HH:mm:ss 
 *  
 * @author Arthur(user_006) 
 * @version 1.0.0 2010/04/24 14:00(星期六) 
 */  
public class TimerUtil {  
  
    /** 
     * 获取当前的日期 , 默认格式 
     *  
     * @return 当前的日期 
     */  
    public synchronized static Date getCurrentCalendar() {  
  
        Calendar calendar = Calendar.getInstance();  
        return calendar.getTime();  
    }  
  
    /** 
     * 获取当前日期 , 格式yyyy-MM-dd , 如: 2010-04-24 
     *  
     * @return 
     */  
    public synchronized static String getCurrentDate() {  
  
        Calendar calendar = Calendar.getInstance();  
  
        StringBuffer sb = new StringBuffer();  
  
        sb.append(calendar.get(Calendar.YEAR)).append("-");  
        sb.append(calendar.get(Calendar.MONTH) + 1).append("-");  
        sb.append(calendar.get(Calendar.DAY_OF_MONTH));  
        return sb.toString();  
    }  
  
    /** 
     * 把字符形式的日期转换成Date类型 , 格式yyyy-MM-DD 
     *  
     * @param date 
     *            日期的字符串形式 
     *  
     * @return Data类型的日期 
     */  
    public synchronized static Date convertToDate(String date) {  
  
        DateFormat format = new SimpleDateFormat("yyyy-MM-DD");  
  
        try {  
  
            return format.parse(date);  
  
        } catch (ParseException e) {  
  
            e.printStackTrace();  
        }  
        return null;  
    }  
  
    /** 
     * 把日期转换为指定的格式 
     *  
     * @param date 
     *            要转换的日期 
     * @param pattern 
     *            转换的格式 
     * @return 
     */  
    public synchronized static Date format(Date date, String pattern) {  
  
        if (pattern != null && pattern.trim().length() > 0) {  
  
            DateFormat format = new SimpleDateFormat(pattern);  
  
            String stringDate = format.format(date);  
  
            return TimerUtil.convertToDate(stringDate);  
        }  
        return null;  
    }  
  
    /** 
     * 将日期转换为字符串 , 格式yyyy-MM-dd HH:mm:ss 
     *  
     * @param date 
     *            要转换的日期 
     * @return 
     */  
    public synchronized static String convertToString(Date date) {  
  
        DateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");  
        return format.format(date);  
    }  
      
    /** 
     * 将日期转换为字符串 , 格式yyyy-MM-dd HH:mm:ss 
     *  
     * @param date 
     *            要转换的日期 
     * @return 
     */  
    public synchronized static String convertToStrShort(Date date) {  
  
        DateFormat format = new SimpleDateFormat("yyyy-MM-dd");  
        return format.format(date);  
    }  
  
    /** 
     * 将日期转换为字符串 , 格式yyyyMMddHHmmss 
     *  
     * @param date 
     *            要转换的日期 
     * @return 
     */  
    public synchronized static String convertToString2(Date date) {  
        DateFormat format = new SimpleDateFormat("yyyyMMddHHmmss");  
        return format.format(date);  
    }  
  
      
    /** 
     * 将日期转换为指定格式的字符串 
     *  
     * @param date 
     *            要转换的日期 
     * @param formatText 
     *            转换的格式 
     * @return 
     */  
    public synchronized static String convertToString(Date date,  
            String formatText) {  
  
        DateFormat format = new SimpleDateFormat(formatText);  
  
        Calendar calendar = Calendar.getInstance();  
  
        StringBuffer sb = new StringBuffer();  
  
        sb.append(calendar.get(Calendar.YEAR)).append("-");  
        sb.append(calendar.get(Calendar.MONTH) + 1).append("-");  
        sb.append(calendar.get(Calendar.DAY_OF_MONTH));  
  
        return format.format(date);  
    }  
  
    /** 
     * 获取本周一的日期 
     *  
     * @return 
     */  
    public synchronized static Date getMondayOFWeek() {  
  
        Calendar calendar = Calendar.getInstance();  
        calendar.set(Calendar.DAY_OF_WEEK, Calendar.MONDAY);// 这里设置从周一开始,若需要根据系统时区自动获取，则采用下边的方式  
  
        return calendar.getTime();  
    }  
  
    /** 
     * 获取本周日日期 
     *  
     * @return 
     */  
    public synchronized static Date getCurrentWeekday() {  
  
        Calendar calendar = Calendar.getInstance();  
        calendar.add(Calendar.DATE, getCurrentPlus());// 把当前日期的DATE加上当前日期与本周日之间相差的天数  
        return calendar.getTime();  
    }  
  
    /** 
     * 获取上周日的日期 
     *  
     * @return 
     */  
    public synchronized static Date getPreviousWeekday() {  
  
        Calendar calendar = Calendar.getInstance();  
        // calendar.set(Calendar.DAY_OF_WEEK, Calendar.SUNDAY+7);  
        calendar.add(Calendar.DATE, getCurrentPlus() - 7);// 把当前日期的DATE加上当前日期与本周日之间相差的天数  
        return calendar.getTime();  
    }  
  
    /** 
     * 获取上周日的日期 
     *  
     * @return 
     */  
    public synchronized static Date getPreviousMonday() {  
  
        Calendar calendar = Calendar.getInstance();  
        // calendar.set(Calendar.DAY_OF_WEEK, Calendar.SUNDAY+7);  
        calendar.add(Calendar.DATE, getCurrentPlus() - 13);// 把当前日期的DATE加上当前日期与本周日之间相差的天数  
        return calendar.getTime();  
    }  
  
    /** 
     * 获取上周日的日期 
     *  
     * @return 
     */  
    public synchronized static Date getNextWeekday() {  
  
        Calendar calendar = Calendar.getInstance();  
        // calendar.set(Calendar.DAY_OF_WEEK, Calendar.SUNDAY+7);  
        calendar.add(Calendar.DATE, getCurrentPlus() + 1 + 6);// 把当前日期的DATE加上当前日期与本周日之间相差的天数  
        return calendar.getTime();  
    }  
  
    /** 
     * 获取上周日的日期 
     *  
     * @return 
     */  
    public synchronized static Date getNextMonday() {  
  
        Calendar calendar = Calendar.getInstance();  
        // calendar.set(Calendar.DAY_OF_WEEK, Calendar.SUNDAY+7);  
        calendar.add(Calendar.DATE, getCurrentPlus() + 1);// 把当前日期的DATE加上当前日期与本周日之间相差的天数  
        return calendar.getTime();  
    }  
  
    /** 
     * 获取当前日期与本周周日之间相差的天数 
     *  
     * @return 
     */  
    public synchronized static int getCurrentPlus() {  
  
        Calendar calendar = Calendar.getInstance();  
        int days = calendar.get(Calendar.DAY_OF_WEEK) - 1;// 在中国是已星期一作为一周的第一天,所以这里减1  
        return 7 - days;  
    }  
  
    public synchronized static int getCurrentYear() {  
  
        Calendar calendar = Calendar.getInstance();  
        return calendar.get(Calendar.YEAR);  
    }  
  
    /** 
     * 返回指定日期的当月第一天 
     *  
     * @param date 
     * @return 
     */  
    @SuppressWarnings("static-access")  
    public synchronized static Date getFirstDayInMonth(Date date) {  
  
        Calendar calendar = Calendar.getInstance();  
        calendar.setTime(date);  
        calendar.set(calendar.DATE, 1);  
        return calendar.getTime();  
    }  
  
    /** 
     * 返回指定日期的当月最后一天 
     *  
     * @param date 
     * @return 
     */  
    @SuppressWarnings("static-access")  
    public synchronized static Date getLastDayInMonth(Date date) {  
  
        Calendar calendar = Calendar.getInstance();  
  
        calendar.setTime(date);  
        calendar.add(calendar.MONTH, 1);  
        calendar.set(calendar.DATE, 1);  
        calendar.add(calendar.DATE, -1);  
  
        return calendar.getTime();  
    }  
  
    /* 
     * 计算两个日期之间的天数 
     */  
    public static int getDaysBetween(Calendar d1, Calendar d2) {  
        if (d1.after(d2)) {  
            java.util.Calendar swap = d1;  
            d1 = d2;  
            d2 = swap;  
        }  
        int days = d2.get(Calendar.DAY_OF_YEAR) - d1.get(Calendar.DAY_OF_YEAR);  
        int y2 = d2.get(Calendar.YEAR);  
        if (d1.get(Calendar.YEAR) != y2) {  
            d1 = (Calendar) d1.clone();  
            do {  
                days += d1.getActualMaximum(Calendar.DAY_OF_YEAR);// 得到当年的实际天数  
                d1.add(Calendar.YEAR, 1);  
            } while (d1.get(Calendar.YEAR) != y2);  
        }  
        return days;  
    }  
    /* 
     * 计算两个日期之间的时间 
     */  
    public static String getGapTime(Date createTime) {  
        // TODO Auto-generated method stub  
        Calendar d2 = Calendar.getInstance();  
        Calendar d1 = Calendar.getInstance();  
        d1.setTime(createTime);  
        int days = d2.get(Calendar.DAY_OF_YEAR) - d1.get(Calendar.DAY_OF_YEAR);  
        if (days < 1) {  
            int hour = d2.get(Calendar.HOUR_OF_DAY)  
                    - d1.get(Calendar.HOUR_OF_DAY);  
            if (hour < 1) {  
                int munites = d2.get(Calendar.MINUTE) - d1.get(Calendar.MINUTE);  
                if (munites == 0) {  
                    return "刚刚";  
                } else {  
                    return munites + "分钟前";  
                }  
            } else {  
                return hour + "小时前";  
            }  
  
        } else {  
            return days + "天前";  
        }  
    }  
      
    //加天数  
    public static String addDays(int day){  
        Calendar calendar = Calendar.getInstance();  
        calendar.add(Calendar.DAY_OF_MONTH, day);  
        StringBuffer sb = new StringBuffer();  
        sb.append(calendar.get(Calendar.YEAR)).append("-");  
        sb.append(calendar.get(Calendar.MONTH) + 1).append("-");  
        sb.append(calendar.get(Calendar.DAY_OF_MONTH));  
        return sb.toString();  
    }  
      
    //加年份  
    public static String addYears(String now, int year) throws ParseException{  
          Calendar fromCal=Calendar.getInstance();  
           
           DateFormat dateFormat=new SimpleDateFormat("yyyy-MM-dd");  
       Date date=dateFormat.parse(now);  
       fromCal.setTime(date);  
       fromCal.add(Calendar.YEAR, year);  
         
       return dateFormat.format(fromCal.getTime());  
     }  
      
    //加天数(特定时间)  
    public static String addDate(String now, int day) throws ParseException{  
          Calendar fromCal=Calendar.getInstance();  
           
           DateFormat dateFormat=new SimpleDateFormat("yyyy-MM-dd");  
       Date date=dateFormat.parse(now);  
       fromCal.setTime(date);  
       fromCal.add(Calendar.DATE, day);  
         
       return dateFormat.format(fromCal.getTime());  
     }  
  
    /** 
     * 格多少时间 
     * @throws ParseException  
     */  
  
    @SuppressWarnings("deprecation")  
    public static void main(String[] args) throws ParseException {  
        System.out.println(TimerUtil.addYears("2008-12-01",7));  
    }  
        /*public static void main(String[] args) { 
               String createDate = "2008-12-01"; 
               SimpleDateFormat sdf = new SimpleDateFormat("yyyy-mm-dd"); 
               try { 
                Date date = sdf.parse(createDate); 
                Calendar cl = Calendar.getInstance(); 
                cl.setTime(date); 
                cl.add(Calendar.DATE,31); 
                String temp = ""; 
                temp = sdf.format(cl.getTime()); 
                System.out.println(temp); 
               } catch (ParseException e) { 
                // TODO Auto-generated catch block 
                e.printStackTrace(); 
               } 
            }*/  
}