常用时间转换方法

    /**

     * 将java.util.Date 将换成java.sql.Timestamp

     * @paramdate

     */

    public static Timestamp getTimestampByDate(Date date){

       if(date ==null){

           returnnull;

       }

       Timestamp timestamp = new Timestamp(date.getTime());

       return timestamp;

    }

    /**

     * 将字符串转换成java.sql.Timestamp

     * @param time时间格式的字符串，比如：2013-08-25 12:12:00

     * @param pattern时间格式，比如：yyyy-MM-dd HH:mm:ss

     */

    public static Timestamp getTimestampByString(String time, String pattern){

       if(time == null || pattern == null){

           return null;

       } 

       Timestamp timestamp = null;

       try {

           Format f = new SimpleDateFormat(pattern);

           Date d = null;

           try {

              d = (Date) f.parseObject(time);

           } catch (java.text.ParseException e) {

              e.printStackTrace();

           }  

           timestamp = new Timestamp(d.getTime());

       } catch (ParseException e) {

           e.printStackTrace();

       }

       return timestamp;

    }

    /**

     * 获取时间的字符串

     * @param date时间参数比如 new Date()

     * @param pattern时间格式，比如yyyy-MM-dd HH:mm:ss

     * @return时间date在格式pattern下的字符串，比如：date = new Date(),pattern =yyyy-MM-dd则返回2013-08-25

     */

    public static String getTime(Date date, String pattern){

       if(date ==null || pattern ==null){

           return null;

       }

       Format format = new SimpleDateFormat(pattern);

       String dateString = format.format(date); 

       return dateString;

    }