Java 给定一个月份，获取该月份的前面12个月份

Java程序实现：给定一个月份，获取该月份的前面12个月份：

	/** 
	    *  
	    * @param time  支持 2017-01的时间字符串格式 
	    * @return 
	    */  
	   public static String[] getLast12Months(String time){    
	       //处理月份输入条件  
	       if(time.length()==7){  
	           time=time+"-01 00:00:00";  
	       }else if(time.length()==110){  
	           time=time.substring(0,7)+"-01 00:00:00";  
	       }  
	       Date date = new Date();  
	       SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");    
	       try {  
	            date= sdf.parse(time);  
	       } catch (Exception e) {  
	           return null;  
	       }   
	         
	       String[] last12Months = new String[12];    
	       Calendar cal = Calendar.getInstance();  
	       //设置输入条件时间  
	       cal.setTime(date);  
	         
	       cal.set(Calendar.MONTH, cal.get(Calendar.MONTH)+1); //要先+1,才能把本月的算进去  
	       for(int i=0; i<12; i++){   
	           cal.set(Calendar.MONTH, cal.get(Calendar.MONTH)-1); //逐次往前推1个月    
	           last12Months[11-i] = cal.get(Calendar.YEAR)+ "-" + addZeroForNum(String.valueOf(cal.get(Calendar.MONTH)+1), 2);    
	       }    
	         
	       return last12Months;    
	   }    
	   public static String addZeroForNum(String str, int strLength) {    
	       int strLen = str.length();    
	       if (strLen < strLength) {    
	           while (strLen < strLength) {    
	               StringBuffer sb = new StringBuffer();    
	               sb.append("0").append(str);// 左补0    
	               // sb.append(str).append("0");//右补0    
	               str = sb.toString();    
	               strLen = str.length();    
	           }    
	       }    
	       return str;    
	   }    
	     
	   public static void main(String[] args){  
	       String[] last12Months = getLast12Months("2017-12");  
	       for(String s:last12Months)
	       System.out.println(s);  
	   }  

转载出自：http://blog.csdn.net/marvel_cheng/article/details/68066636