JAVA实现企业微信上传/下载临时素材

1、上传临时素材文件，获取media_id

 

 

 废话不多说，直接上代码：

@Override
    public Result<?> mediaUpload(MultipartFile file,String touser) {

        //使用forest去获取token
        String fetchToKen = sanXiaXingYunClient.fetchToken(corpid,corpsecret);
        String accessToken = JSON.parseObject(fetchToKen).get("access_token").toString();
        String line = null;//接口返回的结果
        try {
            // 换行符
            final String newLine = "\r\n";
            final String boundaryPrefix = "--";
            // 定义数据分隔线
            String BOUNDARY = "========7d4a6d158c9";
            //使用时注意更换ip域名
            String upUrl = "https://wwlocal.qq.com/cgi-bin/media/upload?access_token="+accessToken+"&type=image";

            // 服务器的域名
            URL url = new URL(upUrl);
            HttpURLConnection conn = (HttpURLConnection) url.openConnection();
            // 设置为POST情
            conn.setRequestMethod("POST");
            // 发送POST请求必须设置如下两行
            conn.setDoOutput(true);
            conn.setDoInput(true);
            conn.setUseCaches(false);
            // 设置请求头参数
            conn.setRequestProperty("connection", "Keep-Alive");
            conn.setRequestProperty("Charsert", "UTF-8");
            conn.setRequestProperty("Content-Type","multipart/form-data; boundary=" + BOUNDARY);
            conn.setRequestProperty("User-Agent","Mozilla/5.0 (iPhone; CPU iPhone OS 11_0 like Mac OS X) AppleWebKit/604.1.38 (KHTML, like Gecko) Version/11.0 Mobile/15A372 Safari/604.1");
            OutputStream out = new DataOutputStream(conn.getOutputStream());

            // 上传文件
            StringBuilder sb = new StringBuilder();
            sb.append(boundaryPrefix);
            sb.append(BOUNDARY);
            sb.append(newLine);
            // 文件参数,photo参数名可以随意修改
            sb.append("Content-Disposition: form-data;name=\"image\";filename=\""
                    + file.getOriginalFilename() + "\"" + newLine);
            sb.append("Content-Type:application/octet-stream");
            // 参数头设置完以后需要两个换行，然后才是参数内容
            sb.append(newLine);
            sb.append(newLine);

            // 将参数头的数据写入到输出流中
            out.write(sb.toString().getBytes());

            // 读取文件数据
            out.write(file.getBytes());
            // 最后添加换行
            out.write(newLine.getBytes());

            // 定义最后数据分隔线，即--加上BOUNDARY再加上--。
            byte[] end_data = (newLine + boundaryPrefix + BOUNDARY
                    + boundaryPrefix + newLine).getBytes();
            // 写上结尾标识
            out.write(end_data);
            out.flush();
            out.close();
            // 定义BufferedReader输入流来读取URL的响应
            BufferedReader reader = new BufferedReader(new InputStreamReader(
                    conn.getInputStream()));

            while ((line = reader.readLine()) != null) {
                //通过JSON获取响应码中的media_id
                String media_id = JSON.parseObject(line).get("media_id").toString();
               
                return Result.OK(media_id);
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
        return Result.OK("发送失败");

    }

2、获取临时素材

 

 

代码：

@Override
    public File imageFetch(String mediaId) {
        //通过forest获取token
        String fetchToKen = sanXiaXingYunClient.fetchToken(corpid,corpsecret);
        String toKen = JSON.parseObject(fetchToKen).get("access_token").toString();
        try {
            String url = null;
            //GET_TMP_MATERIAL为你访问的地址
            url = String.format(GET_TMP_MATERIAL, toKen, mediaId);
            URL u = new URL(url);
            HttpURLConnection  conn = (HttpURLConnection) u.openConnection();
            conn.setRequestMethod("POST");
            conn.connect();
            BufferedInputStream bis = new BufferedInputStream(conn.getInputStream());
            String content_disposition = conn.getHeaderField("content-disposition");
            //微信服务器生成的文件名称
            String file_name ="";
            String[] content_arr = content_disposition.split(";");
            if(content_arr.length  == 2){
                String tmp = content_arr[1];
                int index = tmp.indexOf("\"");
                file_name =tmp.substring(index+1, tmp.length()-1);
            }
            //生成不同文件名称
            File file = new File(file_name);
            BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(file));
            byte[] buf = new byte[2048];
            int length = bis.read(buf);
            while(length != -1){
                bos.write(buf, 0, length);
                length = bis.read(buf);
            }
            bos.close();
            bis.close();
            return file;
        } catch (IOException e) {
            e.printStackTrace();
        }
        return null;
    }

 这是我之前看过的方法，实测可用，分享给大家！