KindEditor上传图片（后台）

@Controller
@RequestMapping(value = "sys/article")
public class FileUploadController {
    private static final ObjectMapper objectMapper = new ObjectMapper();

    @PostMapping(value = "/fileUpload")
    @ResponseBody
    public Map<String, Object> fileUpload(HttpServletRequest request, HttpServletResponse response) {
        ServletContext application = request.getSession().getServletContext();
        String savePath = "D:/attached/";

        // 文件保存目录URL
        String saveUrl = request.getContextPath() + "/images/";

        // 定义允许上传的文件扩展名
        HashMap<String, String> extMap = new HashMap<String, String>();
        extMap.put("image", "gif,jpg,jpeg,png,bmp");
        extMap.put("flash", "swf,flv");
        extMap.put("media", "swf,flv,mp3,wav,wma,wmv,mid,avi,mpg,asf,rm,rmvb");
        extMap.put("file", "doc,docx,xls,xlsx,ppt,htm,html,txt,zip,rar,gz,bz2");

        // 最大文件大小
        long maxSize = 1000000;

        response.setContentType("text/html; charset=UTF-8");

        if (!ServletFileUpload.isMultipartContent(request)) {
            return getError("请选择文件。");
        }
        // 检查目录
        File uploadDir = new File(savePath);
        if (!uploadDir.isDirectory()) {
            return getError("上传目录不存在。");
        }
        // 检查目录写权限
        if (!uploadDir.canWrite()) {
            return getError("上传目录没有写权限。");
        }

        String dirName = request.getParameter("dir");
        if (dirName == null) {
            dirName = "image";
        }
        if (!extMap.containsKey(dirName)) {
            return getError("目录名不正确。");
        }
        // 创建文件夹
        savePath += dirName + "/";
        saveUrl += dirName + "/";
        File saveDirFile = new File(savePath);
        if (!saveDirFile.exists()) {
            saveDirFile.mkdirs();
        }
        SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd");
        String ymd = sdf.format(new Date());
        savePath += ymd + "/";
        saveUrl += ymd + "/";
        File dirFile = new File(savePath);
        if (!dirFile.exists()) {
            dirFile.mkdirs();
        }

        FileItemFactory factory = new DiskFileItemFactory();
        ServletFileUpload upload = new ServletFileUpload(factory);
        upload.setHeaderEncoding("UTF-8");

        MultipartHttpServletRequest multipartRequest = (MultipartHttpServletRequest) request;

        Iterator item = multipartRequest.getFileNames();
        while (item.hasNext()) {

            String fileName = (String) item.next();

            MultipartFile file = multipartRequest.getFile(fileName);
            // 检查文件大小
            if (file.getSize() > maxSize) {
                return getError("上传文件大小超过限制。");
            }

            // 检查扩展名
            String fileExt = file.getOriginalFilename().substring(file.getOriginalFilename().lastIndexOf(".") + 1).toLowerCase();

            if (!Arrays.asList(extMap.get(dirName).split(",")).contains(fileExt)) {
                return getError("上传文件扩展名是不允许的扩展名。\n只允许"
                        + extMap.get(dirName) + "格式。");

            }
            SimpleDateFormat df = new SimpleDateFormat("yyyyMMddHHmmss");

            String newFileName = df.format(new Date()) + "_" + new Random().nextInt(1000) + "." + fileExt;

            try {

                File uploadedFile = new File(savePath, newFileName);

                ByteStreams.copy(file.getInputStream(), new FileOutputStream(uploadedFile));

            } catch (Exception e) {

                return getError("上传文件失败。");

            }
            Map<String, Object> msg = new HashMap<String, Object>();
            msg.put("error", 0);
            msg.put("url", saveUrl + newFileName);
            return msg;
        }
        return null;
    }

    private Map<String, Object> getError(String errorMsg) {
        Map<String, Object> errorMap = new HashMap<String, Object>();
        errorMap.put("error", 1);
        errorMap.put("message", errorMsg);
        return errorMap;
    }

    /**
     * 文件空间
     *
     * @param request  {@link HttpServletRequest}
     * @param response {@link HttpServletResponse}
     * @return json
     */
    @GetMapping(value = "/fileManager")
    @ResponseBody
    public Object fileManager(HttpServletRequest request, HttpServletResponse response) throws Exception {
        ServletContext application = request.getSession().getServletContext();
        ServletOutputStream out = response.getOutputStream();
        //根目录路径，可以指定绝对路径
        String rootPath = "D:/attached/";
        //根目录URL，可以指定绝对路径，比如 http://www.yoursite.com/attached/
        String rootUrl = request.getContextPath() + "/images/";
        //图片扩展名
        String[] fileTypes = new String[]{"gif", "jpg", "jpeg", "png", "bmp"};

        String dirName = request.getParameter("dir");
        if (dirName != null) {
            if (!Arrays.<String>asList(new String[]{"image", "flash", "media", "file"}).contains(dirName)) {
                return "Invalid Directory name.";
            }
            rootPath += File.separator + dirName + File.separator;
            rootUrl += dirName + "/";
            File saveDirFile = new File(rootPath);
            if (!saveDirFile.exists()) {
                saveDirFile.mkdirs();
            }
        }
        //根据path参数，设置各路径和URL
        String path = request.getParameter("path") != null ? request.getParameter("path") : "";
        String currentPath = rootPath + path;
        String currentUrl = rootUrl + path;
        String currentDirPath = path;
        String moveupDirPath = "";
        if (!"".equals(path)) {
            String str = currentDirPath.substring(0, currentDirPath.length() - 1);
            moveupDirPath = str.lastIndexOf("/") >= 0 ? str.substring(0, str.lastIndexOf("/") + 1) : "";
        }

        //排序形式，name or size or type
        String order = request.getParameter("order") != null ? request.getParameter("order").toLowerCase() : "name";

        //不允许使用..移动到上一级目录
        if (path.indexOf("..") >= 0) {
            return "Access is not allowed.";
        }
        //最后一个字符不是/
        if (!"".equals(path) && !path.endsWith("/")) {
            return "Parameter is not valid.";
        }
        //目录不存在或不是目录
        File currentPathFile = new File(currentPath);
        if (!currentPathFile.isDirectory()) {
            return "Directory does not exist.";
        }

        //遍历目录取的文件信息
        List<Map<String, Object>> fileList = new ArrayList<Map<String, Object>>();
        if (currentPathFile.listFiles() != null) {
            for (File file : currentPathFile.listFiles()) {
                Hashtable<String, Object> hash = new Hashtable<String, Object>();
                String fileName = file.getName();
                if (file.isDirectory()) {
                    hash.put("is_dir", true);
                    hash.put("has_file", (file.listFiles() != null));
                    hash.put("filesize", 0L);
                    hash.put("is_photo", false);
                    hash.put("filetype", "");
                } else if (file.isFile()) {
                    String fileExt = fileName.substring(fileName.lastIndexOf(".") + 1).toLowerCase();
                    hash.put("is_dir", false);
                    hash.put("has_file", false);
                    hash.put("filesize", file.length());
                    hash.put("is_photo", Arrays.<String>asList(fileTypes).contains(fileExt));
                    hash.put("filetype", fileExt);
                }
                hash.put("filename", fileName);
                hash.put("datetime", new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(file.lastModified()));
                fileList.add(hash);
            }
        }

        if ("size".equals(order)) {
            Collections.sort(fileList, new SizeComparator());
        } else if ("type".equals(order)) {
            Collections.sort(fileList, new TypeComparator());
        } else {
            Collections.sort(fileList, new NameComparator());
        }
        Map<String, Object> result = new HashMap<String, Object>();
        result.put("moveup_dir_path", moveupDirPath);
        result.put("current_dir_path", currentDirPath);
        result.put("current_url", currentUrl);
        result.put("total_count", fileList.size());
        result.put("file_list", fileList);

        return result;
    }

    private class NameComparator implements Comparator<Map<String, Object>> {
        @Override
        public int compare(Map<String, Object> hashA, Map<String, Object> hashB) {
            if (((Boolean) hashA.get("is_dir")) && !((Boolean) hashB.get("is_dir"))) {
                return -1;
            } else if (!((Boolean) hashA.get("is_dir")) && ((Boolean) hashB.get("is_dir"))) {
                return 1;
            } else {
                return ((String) hashA.get("filename")).compareTo((String) hashB.get("filename"));
            }
        }
    }

    private class SizeComparator implements Comparator<Map<String, Object>> {
        @Override
        public int compare(Map<String, Object> hashA, Map<String, Object> hashB) {
            if (((Boolean) hashA.get("is_dir")) && !((Boolean) hashB.get("is_dir"))) {
                return -1;
            } else if (!((Boolean) hashA.get("is_dir")) && ((Boolean) hashB.get("is_dir"))) {
                return 1;
            } else {
                if (((Long) hashA.get("filesize")) > ((Long) hashB.get("filesize"))) {
                    return 1;
                } else if (((Long) hashA.get("filesize")) < ((Long) hashB.get("filesize"))) {
                    return -1;
                } else {
                    return 0;
                }
            }
        }
    }

    private class TypeComparator implements Comparator<Map<String, Object>> {
        @Override
        public int compare(Map<String, Object> hashA, Map<String, Object> hashB) {
            if (((Boolean) hashA.get("is_dir")) && !((Boolean) hashB.get("is_dir"))) {
                return -1;
            } else if (!((Boolean) hashA.get("is_dir")) && ((Boolean) hashB.get("is_dir"))) {
                return 1;
            } else {
                return ((String) hashA.get("filetype")).compareTo((String) hashB.get("filetype"));
            }
        }
    }
}
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