• 申请测试公众号
• 利用测试公重号发布消息，报{"errcode":40113,"errmsg":"unsupported file type hint: [xxa009498677] rid: 6285f41d-0d4c84df-20472d8c"}

不支持文件类型，新增永久封面图不支持？thumb

//代码如下
public  String testUpload(String path, String type) {
    File file = new File(path);
    //地址
    //String url = "https://api.weixin.qq.com/cgi-bin/media/upload?access_token=ACCESS_TOKEN&type=TYPE";
    url = url.replace("ACCESS_TOKEN", token).replace("TYPE", type);

    try {
        URL urlObj = new URL(url);

        HttpsURLConnection urlConnection = (HttpsURLConnection) urlObj.openConnection();

        //设置属性,设置链接的信息
        urlConnection.setDoInput(true);
        urlConnection.setDoOutput(true);
        urlConnection.setUseCaches(false);
        //设置请求头信息
        urlConnection.setRequestProperty("Connection", "Keep-Alive");
        urlConnection.setRequestProperty("Charset", "utf8");
        //数据的边界,什么都可以，相对而言设置成随机的
        String boundary = "-----" + System.nanoTime();
        urlConnection.setRequestProperty("Content-Type", "multipart/form-data;boundary=" + boundary);
        //获取输出流
        out = urlConnection.getOutputStream();
        //创建文件的输入流
        InputStream inputStream = new FileInputStream(file);

        //第一部分，头部信息
            //准备头部信息
        StringBuilder sb = new StringBuilder();
        sb.append("--");//post表单要求
        sb.append(boundary);
        sb.append("\r\n");
        sb.append("Content-Disposition:form-data;name=\"media\";filename=\"" + file.getName() +"\"\r\n");
        sb.append("Content-Type:application/octet-stream\r\n\r\n");
        System.out.println("stringBuilder is: "+ sb);
        out.write(sb.toString().getBytes());

        //第二部分，文件内容
        byte[] b= new byte[1024];
        int len;
        while ((len = inputStream.read(b)) != -1){
            out.write(b,0,len);
        }
        //第三部分，尾部信息
        String foot = "\r\n--"+boundary + "--\r\n";
        out.write(foot.getBytes());

        //整个写完
        out.flush();
        out.close();

        StringBuilder res = new StringBuilder();
        //读取信息
        InputStream ins = urlConnection.getInputStream();
        while ((len = ins.read(b)) != -1){
            res.append(new String(b,0,len));
        }
        return res.toString();
    } catch (Exception e) {
        e.printStackTrace();
    }

    return "no";
}

/**
 * 测试上传临时素材
 */
@Test
public  void testUploadTmpFile(){
    String path = "C:\\Users\\34743\\Desktop\\ma.jpg";
    String res = testUpload(path, "thumb");
    System.out.println(res);
}