java实现字符串数字部分自增

1 <select id="getLastNo" resultType="string">
2 
3   SELECT  no from t_staff ORDER BY no DESC LIMIT 0,1
4 
5 </select>

 1 @RequestMapping("/staff/staffno.do")
 2 @ResponseBody
 3 public JsonLayBean getNo(){
 4     String no = staffService.getLastNo();
 5     System.out.println(no);
 6 
 7     String num=no.substring(2);// no.substring(2)去掉前两个字符
 8     System.out.println(num);
 9     int num1=Integer.parseInt(num);
10 
11     num1++;
12     String str = String.format("%06d", num1);//如果小于6位左边补0
13     System.out.println(str);
14 
15     String ret=no.substring(0,2)+str;
16     System.out.println(ret);
17 
18     return JsonUtils.createJsonBean(1,ret,0,ret);
19 }