java获取昨天日期字符串的方法

本文实例讲述了java获取昨天日期字符串的方法。分享给大家供大家参考，具体如下：

import java.text.simpledateformat;
import java.util.date;
public class test
{
  /**
   * 获取昨天的日期字符串
   *
   * @param nowdate
   *      当前日期的字符串
   * @return
   */
  public static string getlastdayinfo(string nowdate)
  {
    string yesterday = "";
    int year = 0;
    int month = 0;
    int day = 0;
    try
    {
      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) throws exception
  {
    system.out.println(getlastdayinfo("2008-03-01"));
    system.out.println(getlastdayinfo("2008-01-01"));
    simpledateformat sdf = new simpledateformat("mmmm-dd-yyyy");
    date date;
    string datetime = "02-14-1984";
    try
    {
      date = sdf.parse(datetime);
      system.out.println(sdf.format(date));
    } catch (exception e)
    {
      system.out.println(e.getmessage());
    }
    date d = java.sql.date.valueof("2008-07-06");
    system.out.println(d.tostring());
  }
}

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希望本文所述对大家java程序设计有所帮助。