纵表变树结构

import lombok.Data;

@Data
public class Menu {
    //菜单ID
    private Long privilegeId;
    //菜单链接
    private String url;
    //当前菜单code
    private String privilegeCode;
    //当前菜单名称
    private String privilegeName;
    //父菜单code
    private String parentCode;
    //是否显示菜单
    private String displayOrder;
    //菜单类型
    private Integer menuType;
    //子菜单列表
    private List<Menu> children;
}

      /**
       * 根据parentCode获取子菜单想
       *
       * @param parentCode  父菜单code
       * @param queryAllMenuEntityList 子菜单列表
       * @return
       */
      private List<Menu> getSubMenu(String parentCode, List<Menu> queryAllMenuEntityList) {
          if (queryAllMenuEntityList != null) {
              List<Menu> childrenMenu = new ArrayList<>();
              for (QueryAllMenuEntity queryAllMenuEntity : queryAllMenuEntityList) {
                  if (queryAllMenuEntity.getParentCode().equalsIgnoreCase(parentCode)) {
                      childrenMenu.add(queryAllMenuEntity);
                  }
              }
              for (Menu menu : childrenMenu) {
                  menu.setChildren(getSubMenu(menu.getCode(), queryAllMenuEntityList));
              }
              return childrenMenu;
          } else {
              return null;
          }
      }

    
   //获取菜单树
   public List<Menu> getTreeMenu(){
      //从表中获取纵表菜单数据
      List<Menu> allMenuEntityList = menuService.leftMenu(userCode);
      //构建菜单树 rootMenuCode 根菜单code
      List<Menu> menuTree = getSubMenu(rootMenuCode, allMenuEntityList);
      
      return menuTree;
   }