Map转List 数据库返回的Map数据转List

1.如图4列（一条数据）数据转为List

SELECT 27 '数量1', 30 '数量2', 60 '数量3', 20 '数量4' from dual;

 

2.Controller层具体实现

    @RequestMapping(value = {"getData"}, method = {RequestMethod.GET})
    public List<Map<String, Object>> getData() {
    	Map<String, Object> res = commondataService.getData();//从sql拿到的数据库数据
    	List<Map<String, Object>> r = new ArrayList<>();
    	res.forEach((k, v) -> r.add(new HashMap<String, Object>(){
   
   {put("num",v);put("name",k);}}));//转换为list 行搞定
    	return r;//返回list
    }