java实现根据当前日期获取前一天的信息

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/**
* 根据当前日期获取昨天和前天的信息
* @param nowDay's format:2006-06-17
*/
public static Properties getYesterdayAndtheDayOfYesterday(String nowDate)
{
  Properties prop = new Properties();

  try
  {
         String yesterday = getLastDayInfo(nowDate);
         String theDayOfYesterday = getLastDayInfo(yesterday);

         prop.setProperty("yesterday",yesterday);
         prop.setProperty("theDayOfYesterday",theDayOfYesterday);
  }
  catch(Exception e)
  {
   e.printStackTrace();
  }

  return prop;
}

/**
* 获取上一天的信息
* @param nowDate format:2006-06-17
* @return
*/
public static String getLastDayInfo(String nowDate)
{
  String yesterday = "";
  int year = 0;
  int month = 0;
  int day = 0;
  try
  {
   System.out.println("0000000nowDate = " + nowDate);
         //2006-06-17
         year = Integer.parseInt(nowDate.substring(0,nowDate.indexOf("-")));
         month = Integer.parseInt(nowDate.substring(nowDate.indexOf("-")+1,nowDate.lastIndexOf("-")));
         day = Integer.parseInt(nowDate.substring(nowDate.lastIndexOf("-")+1));


         System.out.println("nowYear = " + year);
         System.out.println("nowMonth = " + month);
         System.out.println("dayDay = " + day);

         day = day - 1;
         if(day == 0)
         {
         month = month - 1;
         if(month == 0)
         {
           //January
           month = 12;
           day = 31;
           year = year - 1;
         }
         else
         {
           //not Jan.
           switch(month)
           {
           //1|3|5|7|8|10|12) day=31;;
            case 1:
             day = 31;
             break;
            case 3:
             day = 31;
             break;
            case 5:
             day = 31;
             break;
            case 7:
             day = 31;
             break;
            case 8:
             day = 31;
             break;
            case 10:
             day = 31;
             break;
            case 12:
             day = 31;
             break;
             //4|6|9|11) day=30;;
            case 4:
             day = 30;
             break;
            case 6:
             day = 30;
             break;
            case 9:
             day = 30;
             break;
            case 11:
             day = 30;
             break;
            case 2:
             if(year % 4 ==0 && year % 100 !=0 || year % 400 ==0)
             {
              //leap year
              day = 29;
             }
             else day = 28;

           }

         }
         }

         String monthStr = "";
         String dayStr = "";

   if(month < 10)
   {
    monthStr = "0" + String.valueOf(month);
   }
   else
   {
    monthStr = String.valueOf(month);
   }

   if(day < 10)
   {
    dayStr = "0" + String.valueOf(day);
   }
   else
   {
    dayStr = String.valueOf(day);
   }

         yesterday = String.valueOf(year) + "-" + monthStr + "-" + dayStr;
  }
  catch(Exception e)
  {
   e.printStackTrace();
  }
  return yesterday;
}

public static void main(String[] args)
{
  getYesterdayAndtheDayOfYesterday("2008-03-01");
}