Object转Map Map->list array->list list->Map

Map map1= new HashMap();
  map1 = BeanUtils.describe(obj); 

Map 转化为List

Map map=new HashMap();
  map.put("id", "root");
  map.put("name", "百货公司");
  List list=departMentService.showDepartmentNameList();
  list.add(map);//Map转化为List,且将“百货公司”这一数据存到list中

String sarray[]=idArr.split(",");
  //数组转化为List
  List<String> list = new ArrayList<String>(Arrays.asList(sarray));
  //List转化为Map
  Map idMap = new HashMap();
  idMap.put("id", list);