工具类

public static int ceil(int a,int b){
		double t1=a;
		double t2=b;
		int c=(int) Math.ceil(t1/t2);
		return c;
	}

ceil()方法执行的是向上取整计算，它返回的是大于或等于函数参数，并且与之最接近的整数
 
3,2---->2

转成负数
public static int zhuanfu(int i){
		if(i>0){
			String str=String.valueOf(i);
			str="-"+str;
			return Integer.valueOf(str);
		}else return i;
	}

获取现在时间
public static String getNowTime(){
		Date date = new Date(System.currentTimeMillis());
		return FastDateFormat.getInstance("yyyyMMddHHmmss").format(date);
	}	

1-10之间随机取6位数
public static String getRandom(long l){  
        char[] randoms = {'1', '2', '3', '4', '5', '6', '7', '8', '9'};
        Random random = new Random(l);   
        StringBuffer ret = new StringBuffer();   
        for (int i = 0; i < 6; i++) {   
            ret.append(randoms[random.nextInt(randoms.length)]);
        }   
        random = null;   
        return ret.toString();		
	}

获取年份
public static int getYear(Date date){
		Calendar calendar = Calendar.getInstance();
		calendar.setTime(date);
		return calendar.get(Calendar.YEAR);
	}

获取星期数
public static int getWeekNumber(Date date) {
		Calendar calendar = Calendar.getInstance();
		calendar.setFirstDayOfWeek(Calendar.MONDAY);

		calendar.setTime(date);
		return calendar.get(Calendar.WEEK_OF_YEAR);
	}

public static Date getFirstDayOfWeek(Date date) {
		Calendar c = new GregorianCalendar();
		c.setFirstDayOfWeek(Calendar.MONDAY);
		c.setTime(date);
		c.set(Calendar.DAY_OF_WEEK, c.getFirstDayOfWeek()); // Monday 
		return c.getTime();
	} 
	
	public static Date getLastDayOfWeek(Date date) {
		Calendar c = new GregorianCalendar();
		c.setFirstDayOfWeek(Calendar.MONDAY);
		c.setTime(date);
		c.set(Calendar.DAY_OF_WEEK, c.getFirstDayOfWeek() + 6); // Sunday 
		return c.getTime();
	}