java.text.SimpleDateFormat  

          sdf=new   java.text.SimpleDateFormat("yyyy-MM-dd");  
          java.util.Calendar   calendar=java.util.Calendar.getInstance();  
          calendar.setTime(new   java.util.Date());  

          //取得现在时间
          System.out.println(sdf.format(new   java.util.Date()));  

         //取得上一个时间
          calendar.set(Calendar.MONDAY,calendar.get(Calendar.MONDAY)-1);  

         //取得上一个月的下一天
          calendar.set(Calendar.DAY_OF_MONTH,calendar.get(Calendar.DAY_OF_MONTH)+1);  
          System.out.println(sdf.format(calendar.getTime()));

         //运行结果：

         2009-08-24
         2008-07-25

我现在要用到在下拉菜单中循环取出最近一年的yyyymm格式的时间   

    java.text.SimpleDateFormat   sdf=new   java.text.SimpleDateFormat("yyyyMM");  
    java.util.Calendar   calendar=java.util.Calendar.getInstance();  
    calendar.setTime(new   java.util.Date());  
    for (int i = 0 ; i < 12 ;i++){
        calendar.set(Calendar.MONDAY,calendar.get(Calendar.MONDAY)-1);
        System.out.println("sdf========="+sdf.format(calendar.getTime())+"=="+i);
    }

这种就能取出了

运行结果：

sdf=========2009-07-24==0
sdf=========2009-06-24==1
sdf=========2009-05-24==2
sdf=========2009-04-24==3
sdf=========2009-03-24==4
sdf=========2009-02-24==5
sdf=========2009-01-24==6
sdf=========2008-12-24==7
sdf=========2008-11-24==8
sdf=========2008-10-24==9
sdf=========2008-09-24==10
sdf=========2008-08-24==11