java实现树形展示

最新推荐文章于 2025-07-14 23:14:22 发布

weixin_39703044

最新推荐文章于 2025-07-14 23:14:22 发布

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分类专栏： java 文章标签： java 目录树 tree

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本文介绍了一个基于Java的方法来构建组织结构树，通过递归获取所有子级部门，并将其转化为JSON格式的数据，便于前端展示。文章详细展示了如何从数据库中获取组织信息并构建树形结构。

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@RequestMapping("/getOrgTree")
	public void getOrgTree(HttpServletRequest request,HttpServletResponse response,HttpSession session) 
	{
		List<Map<String, Object>> childArray = new ArrayList<Map<String, Object>>();
		try 
		{
			Integer parentId=0;
			// 将节点信息转化成json串的树形结构
			AdminUser user = (AdminUser) session.getAttribute("user");
			//当前登录用户的组织机构
			if(user.getOrgId()==1)
			{
				parentId=0;
			}
			else 
			{
				parentId=user.getOrgParentId();
			}
			List<Organize> treeRootList = organizeService.getOrgRootList(parentId);
			for (Organize organize : treeRootList) 
			{
				Map<String, Object> imageCategory = new HashMap<String, Object>();
				Integer nodeId = Integer.valueOf(organize.getId());
				// 获取节点值
				imageCategory.put("id", nodeId);
				imageCategory.put("pId", organize.getParentId());
				imageCategory.put("name", organize.getOrgName());
				
				//获取子节点
				List<Map<String, Object>> childMap = getOrgChildren(nodeId);
				if(childMap.size()>0)
				{
					imageCategory.put("children", childMap);
					childArray.add(imageCategory);
				}
				else 
				{
					childArray.add(imageCategory);
				}
			}
			//System.out.println(childArray);
			String jsonStr = JSONArray.fromObject(childArray).toString();
	        JSONArray ja = JSONArray.fromObject(jsonStr);
			response.getWriter().print(ja);
		} 
		catch (IOException e) 
		{
			e.printStackTrace();
		}
	}
	
	private List<Map<String, Object>> getOrgChildren(Integer nodeId)
	{  
        List<Map<String, Object>> children = new ArrayList<Map<String, Object>>(); 
        //获取子组织机构
        List<Organize> treeChildList = organizeService.getTreeChildList(nodeId);
        for (Organize child : treeChildList) 
        {  
        	Map<String, Object> imageCategory = new HashMap<String, Object>();
			Integer id = child.getId();
			imageCategory.put("id", id);
			imageCategory.put("pId", child.getParentId());
        	imageCategory.put("name", child.getOrgName());
            
            List<Map<String, Object>> childMap = getOrgChildren(child.getId());
            if(childMap.size()>0)
			{
				imageCategory.put("children", childMap);
				children.add(imageCategory);
			}
            else 
            {
            	children.add(imageCategory);
			}
        }  
        return children;  
    }