Java 给定一个月份，获取该月份的前面12个月份

快来打我* 2023-02-16 12:13 116阅读 0赞

> Java 给定一个月份，获取该月份的前面12个月份

*  参考代码：
    
        /** * * @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;    
             }