整理日期，整理时间段，将日期集合整理为时间段

/**
     * 根据传入的日期集合  整理成时间段
     */
    public static String getDayToTimeSlot(List<String> list){
        String time="";

       Collections.sort(list, new Comparator<String>() {
           @Override
           public int compare(String o1, String o2) {
               if(compareDate(o1,o2)){
                   return 1;
               }
               return -1;
           }
       });
        String time1="";
        String time2="";
       for(int i=0;i<list.size();i++){
           if(i==0){
               time1=list.get(i);
               time2=list.get(i);
           }
            if(i+1<list.size()){
                if(getAfterDayDate(list.get(i),"1").equals(list.get(i+1))){
                    time2=list.get(i+1);

                }else{
                    time+=time1+"至"+time2+",";
                    time1=list.get(i+1);
                    time2=list.get(i+1);

                }
            }else{
                    if(i==0){
                        time+=time1+"至"+time2+",";
                    }else{
                        if(getAfterDayDate(list.get(i-1),"1").equals(list.get(i))){
                            time+=time1+"至"+time2+",";
                        }else{
                            time+=time2+"至"+time2+",";
                        }
                    }


            }


       }


        return time;
    }

    /**
     * 得到当前时间n天之后的日期
     *
     * @param days
     * @return
     */
    public static String getAfterDayDate(String time, String days) {
        int daysInt = Integer.parseInt(days);
        Calendar canlendar = Calendar.getInstance(); // java.util包
        Date date = fomatDate(time);
        canlendar.setTime(date);
        canlendar.add(Calendar.DATE, daysInt); // 日期减 如果不够减会将月变动
        Date time2 = canlendar.getTime();
        if(time.length()>=12){
            SimpleDateFormat sdfd = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
            String dateStr = sdfd.format(time2);
            return dateStr;
        }else{
            SimpleDateFormat sdfd = new SimpleDateFormat("yyyy-MM-dd");
            String dateStr = sdfd.format(time2);
            return dateStr;
        }

    }