fileType:文件类型；

filePath：文件所在路径

public JSONObject uploadMedia(String fileType, String filePath) throws Exception {
    // 返回结果
    String result = null;
    File file = new File(filePath);
    if (!file.exists() || !file.isFile()) {

        throw new IOException("文件不存在");
    }
    String token = publicService.getAppMedssageToken();
    if (token == null) {
        throw new IOException("未获取到token");
    }
    String uploadTempMaterial_url = "https://qyapi.weixin.qq.com/cgi-bin/media/upload?access_token=ACCESS_TOKEN&type=TYPE";
    uploadTempMaterial_url = uploadTempMaterial_url.replace("ACCESS_TOKEN", token).replace("TYPE", fileType);
    URL url = new URL(uploadTempMaterial_url);
    HttpsURLConnection conn = (HttpsURLConnection) url.openConnection();
    conn.setRequestMethod("POST");// 以POST方式提交表单
    conn.setDoInput(true);
    conn.setDoOutput(true);
    conn.setUseCaches(false);// POST方式不能使用缓存
    // 设置请求头信息
    conn.setRequestProperty("Connection", "Keep-Alive");
    conn.setRequestProperty("Charset", "UTF-8");
    // 设置边界
    String BOUNDARY = "----------" + System.currentTimeMillis();
    conn.setRequestProperty("Content-Type", "multipart/form-data; boundary=" + BOUNDARY);
    // 请求正文信息
    // 第一部分
    StringBuilder sb = new StringBuilder();
    sb.append("--");// 必须多两条道
    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");


    // 获得输出流
    OutputStream out = new DataOutputStream(conn.getOutputStream());
    // 输出表头
    out.write(sb.toString().getBytes("UTF-8"));
    // 文件正文部分
    // 把文件以流的方式 推送道URL中
    DataInputStream din = new DataInputStream(new FileInputStream(file));
    int bytes = 0;
    byte[] buffer = new byte[1024];
    while ((bytes = din.read(buffer)) != -1) {
        out.write(buffer, 0, bytes);
    }
    din.close();
    // 结尾部分
    byte[] foot = ("\r\n--" + BOUNDARY + "--\r\n").getBytes("UTF-8");// 定义数据最后分割线
    out.write(foot);
    out.flush();
    out.close();
    if (HttpsURLConnection.HTTP_OK == conn.getResponseCode()) {

        StringBuffer strbuffer = null;
        BufferedReader reader = null;
        try {
            strbuffer = new StringBuffer();
            reader = new BufferedReader(new InputStreamReader(conn.getInputStream()));
            String lineString = null;
            while ((lineString = reader.readLine()) != null) {
                strbuffer.append(lineString);

            }
            if (result == null) {
                result = strbuffer.toString();

            }
        } catch (IOException e) {

            e.printStackTrace();
        } finally {
            if (reader != null) {
                reader.close();
            }
        }

    }
    JSONObject jsonObject = JSONObject.parseObject(result);
    return jsonObject;

}