jquery-ztree从后台获取数据的例子

引入：

前台：

脚本：

 var setting = {};
    $(document).ready(function(){
        $.fn.zTree.init($("#treeDemo"), setting, getTree());
    });


 function getTree() {
        var tree = {};
        $.ajax({
            url: "/tree/query5",
            type: "post",
            contentType: "application/json",
            timeout: 30000, //超时时间：30秒
            async: false,//false-同步（当这个ajax执行完后才会继续执行其他代码）；异步-与其他代码互不影响，一起运行。
            dataType: "json",
            success: function (data) {
                console.log(data);
                tree = data;
            }, error: function (data) {
                console.log(data);
            }
        });
        return tree;
    }

后台：

   @RequestMapping("/query5")
    public String queryForZtree() {
        String path = System.getProperty("user.dir");
        File f = new File(path+"//fillforztree.json");
        if(f.exists()){
           return  FileUtil.fileToString(path+"//fillforztree.json",null,"utf-8");
        }else{
            List> list = new ArrayList<>();
            String content = getTreeForZtree(null, list);
            FileUtil.writeFile(path+"//fillforztree.json", content,false);
            return content;
        }
    }

public static String getTreeForZtree(String path, List> list) {
        String newPath = " ";
        if (path == null) {
            path = "E:\\test";
        }
        Listobjs = FileUtil.getFiles(path);
        for (File s : objs) {
            if (String.valueOf(s).indexOf(".") == -1) {//如果是目录
                Map map = new HashMap();
                map.put("id", path+"\\"+s.getName());
                map.put("name", s.getName());
                map.put("isParent", "true");
                newPath = path.concat("\\").concat(s.getName());
                if (FileUtil.isDirectory(newPath)) {//如果是目录，往下搜索
                    List> childList = new ArrayList>();
                    map.put("children", childList);
                    getTreeForZtree(newPath, childList);
                }
                list.add(map);
            } else {//如果是文件
                Map map = new HashMap();
                map.put("id", path+"\\"+s.getName());
                map.put("name", s.getName());
                list.add(map);
            }
        }

        return JSONArray.toJSONString(list);
    }

工具FileUtil：

	public static List getFiles(String folderPath) {
		File fileDir = new File(folderPath);
        File[] files = fileDir.listFiles();
		List fileList = new ArrayList();
		for (File f : files) {
			fileList.add(f);
		}
		Collections.sort(fileList, new Comparator() {
			@Override
			public int compare(File o1, File o2) {
				if (o1.isDirectory() && o2.isFile())
					return -1;
				if (o1.isFile() && o2.isDirectory())
					return 1;
				return o1.getName().compareTo(o2.getName());
			}
		});
		return fileList;
	}

public static String fileToString(String file,String addRow, String charSet) {
		BufferedReader buf = null;
		String str = null;
		StringBuffer sb = new StringBuffer();
		try {
			buf = new BufferedReader(new InputStreamReader(new FileInputStream(file), charSet));

			while ((str = buf.readLine()) != null) {
				sb.append(str);
				if(addRow!=null)
				sb.append(addRow);
			}
			buf.close();
		} catch (IOException e) {
			e.printStackTrace();
		} finally {
			if (buf != null) {
				try {
					buf.close();
				} catch (IOException e) {
					e.printStackTrace();
				}
			}
		}
		String result = sb.toString();
		// return result.substring(0, result.lastIndexOf("\r\n"));
		return result;
	}


public static void writeFile(String filePath, String content, boolean needRename) {
		String realPath = null;
		if (needRename) {
			realPath = rename(filePath);
		} else {
			realPath = filePath;
		}
		// FileOutputStream会出现中文乱码,用 OutputStreamWriter
		OutputStreamWriter osw = null;
		try {
			osw = new OutputStreamWriter(new FileOutputStream(realPath), "utf-8");
			osw.write(content);
			osw.close();
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		} finally {
			try {
				osw.close();
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
	}

效果图：