借助hutool的Tree和TreeNode数据结构,快速构建树形集合

	/**
	 * 返回树形菜单集合
	 * @return 树形菜单
	 */
	@GetMapping(value = "/tree")
	public R listDeptTrees() {
		return R.ok(sysDeptService.listDeptTrees());
	}

	/**
	 * 查询全部部门树
	 * @return 树
	 */
	@Override
	public List<Tree<Integer>> listDeptTrees() {
		return getDeptTree(this.list(Wrappers.emptyWrapper()));
	}

	/**
	 * 构建部门树
	 * @param depts 部门
	 * @return
	 */
	private List<Tree<Integer>> getDeptTree(List<SysDept> depts) {
		List<TreeNode<Integer>> collect = depts.stream()
				.filter(dept -> dept.getDeptId().intValue() != dept.getParentId())
				.sorted(Comparator.comparingInt(SysDept::getSort))
				.map(dept -> {
					TreeNode<Integer> treeNode = new TreeNode<>();
					treeNode.setId(dept.getDeptId());
					treeNode.setParentId(dept.getParentId());
					treeNode.setName(dept.getName());
					return treeNode;
				}).collect(Collectors.toList());

		return TreeUtil.build(collect, 0);
	}

这种方法比10行代码搞定树形结构数据更容易看懂