下拉列表树形结构

上级菜单<select id="cc" class="easyui-combotree" style="width:223px;" name=‘parentid‘
        data-options="url:‘<%=request.getContextPath()%>/sysMenu/combolist‘">

    @RequestMapping("/combolist")
    public void combolist(HttpServletRequest request,HttpServletResponse response){

        List<SysMenu> list = null;
        Map<String,Object> params = new HashMap<String,Object>();
        HashMap<String,Object> dataMap = new HashMap<String,Object>();

        //查询列表
        list = this.sysMenuService.list(params);

        List menuList = new ArrayList<Map>();
        //根菜单
        HashMap<String,Object> menuRootMap = new HashMap<>();

        ArrayList<Map<String,Object>> modalArray = new ArrayList<Map<String,Object>>();
        for(SysMenu menuParent : list){

            if(menuParent.getParentid() == null || menuParent.getParentid() == 0){
                menuRootMap.put("id", menuParent.getId());
                menuRootMap.put("text", menuParent.getName());
            }

            //二级模块
            if(menuParent.getParentid() == 13){
                HashMap<String,Object> menuParentMap = new HashMap<String,Object>();
                ArrayList<Map<String,Object>> childrenList = new ArrayList<Map<String,Object>>() ;
                menuParentMap.put("id", menuParent.getId());
                menuParentMap.put("text", menuParent.getName());

                //菜单
                for(SysMenu menuChildren : list){

                    if(menuChildren.getParentid().intValue() == menuParent.getId().intValue()){
                        HashMap<String,Object> menuChildrenMap = new HashMap<>();
                        menuChildrenMap.put("id", menuChildren.getId());
                        menuChildrenMap.put("text", menuChildren.getName());

                        childrenList.add(menuChildrenMap);
                    }
                }
                menuParentMap.put("children", childrenList);
                modalArray.add(menuParentMap);
            }
        }

        menuRootMap.put("children", modalArray);

        menuList.add(menuRootMap);

        //HashMap<String,Object> messageMap = new HashMap<String,Object>();
        //messageMap.put("rows", list);

        //this.out(response, messageMap);
        this.webOut(response, menuList);
        return;
    }