menu 菜单层级关系MAP组装

来源：互联网发布：wps数据有效性设置取消编辑：程序博客网时间：2024/06/06 23:16

1、map 赋值

2、层级关系map 转换

3、获取某一层级的关系

4、首层排序

5、二层排序（有点冗余）

@ResponseBody@RequestMapping(value="subMenu", method = RequestMethod.POST)public Object submenu(String parent_id,Model model) {List<MenuNodeForm> subMenuList = new ArrayList<MenuNodeForm>();try {List<BaseMenu> subMenu = null;Map<String, MenuNodeForm> map = new HashMap<String, MenuNodeForm>();if(parent_id != null && !"".equals(parent_id)){subMenu = menuService.subMenu("0",this.getCurrentUser().roles);for (BaseMenu menu: subMenu) {if (menu.getId() != null && !"".equals(menu.getId())) {MenuNodeForm nodeForm = new MenuNodeForm();nodeForm.setId(menu.getId());nodeForm.setCaption(menu.getCaption());nodeForm.setMenu_type(menu.getMenu_type());nodeForm.setResource_url(menu.getResource_url());nodeForm.setParent_id(menu.getParent_id());nodeForm.setSort(menu.getSort());map.put(menu.getId(),nodeForm);}}for ( Entry<String, MenuNodeForm> entry : map.entrySet() ) {MenuNodeForm menuNodeForm = entry.getValue();String sParentId = menuNodeForm.getParent_id();MenuNodeForm nodeTree = map.get(sParentId);if ( nodeTree != null ) {nodeTree.getBaseMenu().add(menuNodeForm);}}Iterator<String> it = map.keySet().iterator();while (it.hasNext()) {String key = it.next().toString();if(map.get(key).getParent_id().equals(parent_id)){subMenuList.add(map.get(key));}}Collections.sort(subMenuList,new Comparator<MenuNodeForm>(){@Overridepublic int compare(MenuNodeForm arg0, MenuNodeForm arg1) {if(arg0.getSort() != null && arg1.getSort() != null){return arg0.getSort().compareTo(arg1.getSort());} else {return 0;}}});if(subMenuList != null && subMenuList.size() > 0){for(int i = 0; i < subMenuList.size(); i++){if(subMenuList.get(i).getBaseMenu() != null && subMenuList.get(i).getBaseMenu().size() > 0){Collections.sort(subMenuList.get(i).getBaseMenu(),new Comparator<MenuNodeForm>(){@Overridepublic int compare(MenuNodeForm arg0, MenuNodeForm arg1) {if(arg0.getSort() != null && arg1.getSort() != null){return arg0.getSort().compareTo(arg1.getSort());} else {return 0;}}});}}}System.out.println(JSONArray.fromObject(subMenuList));}} catch (SQLException e) {logger.error(e.getMessage());}return JSON.toJSON(subMenuList);}

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