Java 微信公众号上传永久素材的方法

@RequestMapping(value="create")
    public String create(@RequestParam MultipartFile  file, HttpServletRequest request, HttpServletResponse response, HttpSession httpSession, RedirectAttributes attr){
        try {
            String fileName = file.getOriginalFilename();
            fileName = URLEncoder.encode(fileName, "UTF-8");// 进行中文处理
            String UPLOAD_PATH = File.separator + "upload" + File.separator + "img" + File.separator;
            String path = request.getSession().getServletContext().getRealPath(UPLOAD_PATH);
            String pathFileName = path + File.separator + fileName;
            file.transferTo(new File(pathFileName));
            JSONObject mediaJson = addMaterialEver(pathFileName, "image", accessToken.getAccessToken());
            if (mediaJson != null) {
                Media media = new Media();
                media.setMediaId(mediaJson.getString("media_id"));
                media.setUrl(mediaJson.getString("url"));
                media.setUpdateTime(new Date());
                media.setUrl2(fileUpload.fileUpload(file, "", request, response));
                
                mediaMapper.insertSelective(media);
                attr.addFlashAttribute("message", "成功添加图片信息！");
                
            } else {
                attr.addFlashAttribute("message", "添加图片出现问题，请与管理员联系！");
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return "redirect:index.do";
    }
/**
     * 上传其他永久素材(图片素材的上限为5000，其他类型为1000)
     *
     * @return
     * @throws Exception
     */
    public  JSONObject addMaterialEver(String fileurl, String type, String token) {
        try {
            File file = new File(fileurl);
            //上传素材
            String path = "https://api.weixin.qq.com/cgi-bin/material/add_material?access_token=" + token + "&type=" + type;
            String result = connectHttpsByPost(path, null, file);
            result = result.replaceAll("[\\\\]", "");
            System.out.println("result:" + result);
            JSONObject resultJSON = JSONObject.fromObject(result);
            if (resultJSON != null) {
                if (resultJSON.get("media_id") != null) {
                    System.out.println("上传" + type + "永久素材成功");
                    return resultJSON;
                } else {
                    Integer errcode = (Integer) resultJSON.get("errcode");
                    if(errcode -40001 == 0 ){
                        accessToken.delAccessToken();
                    }
                    System.out.println("上传" + type + "永久素材失败");
                }
            }
            return null;
        } catch (Exception e) {
            e.printStackTrace();
        } 
        return null;
    }
    public static  String connectHttpsByPost(String path, String KK, File file) throws IOException, NoSuchAlgorithmException, NoSuchProviderException, KeyManagementException {
        URL urlObj = new URL(path);
        //连接
        HttpURLConnection con = (HttpURLConnection) urlObj.openConnection();
        String result = null;
        con.setDoInput(true);

        con.setDoOutput(true);

        con.setUseCaches(false); // post方式不能使用缓存

        // 设置请求头信息
        con.setRequestProperty("Connection", "Keep-Alive");
        con.setRequestProperty("Charset", "UTF-8");
        // 设置边界
        String BOUNDARY = "----------" + System.currentTimeMillis();
        con.setRequestProperty("Content-Type",
                "multipart/form-data; boundary="
                        + BOUNDARY);

        // 请求正文信息
        // 第一部分：
        StringBuilder sb = new StringBuilder();
        sb.append("--"); // 必须多两道线
        sb.append(BOUNDARY);
        sb.append("\r\n");
        sb.append("Content-Disposition: form-data;name=\"media\";filelength=\"" + file.length() + "\";filename=\""

                + file.getName() + "\"\r\n");
        sb.append("Content-Type:application/octet-stream\r\n\r\n");
        byte[] head = sb.toString().getBytes("utf-8");
        // 获得输出流
        OutputStream out = new DataOutputStream(con.getOutputStream());
        // 输出表头
        out.write(head);

        // 文件正文部分
        // 把文件已流文件的方式 推入到url中
        DataInputStream in = new DataInputStream(new FileInputStream(file));
        int bytes = 0;
        byte[] bufferOut = new byte[1024];
        while ((bytes = in.read(bufferOut)) != -1) {
            out.write(bufferOut, 0, bytes);
        }
        in.close();
        // 结尾部分
        byte[] foot = ("\r\n--" + BOUNDARY + "--\r\n").getBytes("utf-8");// 定义最后数据分隔线
        out.write(foot);
        out.flush();
        out.close();
        StringBuffer buffer = new StringBuffer();
        BufferedReader reader = null;
        try {
            // 定义BufferedReader输入流来读取URL的响应
            reader = new BufferedReader(new InputStreamReader(con.getInputStream()));
            String line = null;
            while ((line = reader.readLine()) != null) {
                buffer.append(line);
            }
            if (result == null) {
                result = buffer.toString();
            }
        } catch (IOException e) {
            System.out.println("发送POST请求出现异常！" + e);
            e.printStackTrace();
        } finally {
            if (reader != null) {
                reader.close();
            }
        }
        return result;
    }