public int  IntegertimeTag(Date date){ 
        int time=0;
        Calendar c = Calendar.getInstance();
        SimpleDateFormat   simpledate   =   new   SimpleDateFormat( "yyyy-MM-dd HH:mm:ss "); 
        String   Send_date   =   simpledate.format(date);
        
        try {
            time = (int) simpledate.parse(Send_date).getTime();
        } catch (ParseException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } 
        return time;
    } 
    public Date DatetimeTag(int date){ 
        String time=null;
        SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");

        Long now=new Long((long)date); //int  转 long 
          Calendar calendar = Calendar.getInstance();
          calendar.setTimeInMillis(now);
        
          time= formatter.format(calendar.getTime());
          Date date11=null;
          try {
            date11 = formatter.parse(time);
        } catch (ParseException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } 
          
          return date11;
    } 

public class Test {
    public static void main(String[] args){
         Date date = null;
         date = new Date();
         System.out.println(getDateString(date));
         System.out.println(getDateLong(date));
         System.out.println(getDate(getDateLong(date)));
         try {
            System.out.println(getDate(getDateString(date)));
        } catch (ParseException e) {
            e.printStackTrace();
        }
    }
    
    public static String getDateString(Date date){
        return new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(date);
    }
    public static Date getDate(String dateStr) throws ParseException{
        return new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").parse(dateStr);
    }
    public static Long getDateLong(Date date){
        return date.getTime();
    }
    public static Date getDate(Long time){
        Calendar calendar = Calendar.getInstance();
        calendar.setTimeInMillis(time);
        return calendar.getTime();
    }
}

------解决方案--------------------
 public static Date getDate(Long time){
       Calendar calendar = Calendar.getInstance();
       calendar.setTimeInMillis(time);
       return calendar.getTime();
   }
可以这样写啊
  public static Date getDate(Long time){
              return new Date(time);
   }


------解决方案--------------------