private List<String> getNearDate(String isYear){
		List<String> resultList = new ArrayList<String>();
		Calendar cal = Calendar.getInstance();
		if("0".equals(isYear)){
			//近六個月
			cal.set(Calendar.MONTH, cal.get(Calendar.MONTH)+1); //要先+1,才能把本月的算進去
			for(int i=0; i<6; i++){  
	            cal.set(Calendar.MONTH, cal.get(Calendar.MONTH)-1); //逐次往前推1個月  
	            resultList.add(String.valueOf(cal.get(Calendar.YEAR)) + (cal.get(Calendar.MONTH)+1 < 10 ? "0" + (cal.get(Calendar.MONTH)+1) : (cal.get(Calendar.MONTH)+1)));
	        }
		}else {
			//近兩年
			int nowYear = cal.get(Calendar.YEAR);
			int lastYear = nowYear - 1 ;
			resultList.add(String.valueOf(nowYear)); 
			resultList.add(String.valueOf(lastYear)); 
		}
		
		return resultList;
	} 
 

試試大月的31日和1月的最後幾天，會出錯的。

例如在3月31日執行：

cal.set(Calendar.MONTH, cal.get(Calendar.MONTH)+1); //要先+1,才能把本月的算進去

3月31日執行獲取近六個月時，會獲取到四月份。

笨辦法：

/**
	 * 獲取近兩年或者近六個月日期
	 * @param isYear
	 * @return
	 */
	private List<String> getDate(String isYear){
		List<String> resultList = new ArrayList<String>();
		Calendar cal = Calendar.getInstance();
		if("0".equals(isYear)){
			int MONTH_SIZE = 6 ;		  
		    
		    //獲取當前月
			int month = cal.get(Calendar.MONTH)+1;
			int year = cal.get(Calendar.YEAR);
			String aResult = "";
			if(month < 10){
				aResult = year + "0" + month;
			}else{
				aResult = "" + year + month;
			}
			resultList.add(aResult);
			//獲取之前五個月
			for(int i = 0; i<MONTH_SIZE - 1; i++){
				month = month - 1;
				if(0 == month){
					month = 12;
					year = year - 1;
				}
				
				if(month < 10){
					aResult = year + "0" + month;
				}else{
					aResult = "" + year + month;
				}
				
				resultList.add(aResult);
			}
		}else {
			//年度取近兩年
			int nowYear = cal.get(Calendar.YEAR);
			int lastYear = nowYear - 1 ;
			resultList.add(String.valueOf(nowYear)); 
			resultList.add(String.valueOf(lastYear)); 
		}
		return resultList;
	}