电子发票插入微信卡包之PDF上传

项目中需要将开具的电子发票插入到微信的卡包中，采用的是微信自建平台模式。

因为是自己的开的票，所以调用插卡接口前，需要上传PDF文件，代码如下：

/**
     * 将电子发票PDF文件上传至微信
     * @param accessToken 微信的access_token 
     * @param file 本地的pdf文件
     * @return<br>
     * @author xxx, 2019年9月23日.<br>
     */
    public String uploadPdfFile(String accessToken, File file){
        HttpPost httpPost = new HttpPost("https://api.weixin.qq.com/card/invoice/platform/setpdf?access_token="+accessToken);
        CloseableHttpResponse response = null;
        CloseableHttpClient httpClient = HttpClients.createDefault();
        RequestConfig requestConfig = RequestConfig.custom().setSocketTimeout(5000).setConnectTimeout(5000).build();
        httpPost.setConfig(requestConfig);

        //2.3 设置请求实体，封装了请求参数
        HttpEntity requestEntity = MultipartEntityBuilder.create().addPart("pdf",
                new FileBody(file, ContentType.create("multipart/form-data", Consts.UTF_8), file.getName())).build();

        httpPost.setEntity(requestEntity);
        try {
            response = httpClient.execute(httpPost, new BasicHttpContext());
            log.info("\n上传PDF文件至微信返回参数：{}",JSON.toJSONString(response));
            if (response.getStatusLine().getStatusCode() != 200) {
                throw new InsertWxInvoiceCardException(2013,"上传PDF文件至微信,请求失败");
            }
            HttpEntity entity = response.getEntity();
            if (entity != null) {
                String resultStr = EntityUtils.toString(entity, "utf-8");
                log.info("\n上传PDF文件至微信返回参数：{}",resultStr);
                JSONObject result = JSON.parseObject(resultStr);
                int errcode = (Integer)result.get("errcode");
                if(errcode != 0){
                    throw new InsertWxInvoiceCardException(2013,"上传PDF文件至微信失败");
                }
                return result.getString("s_media_id");
            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (response != null)
                try {
                    response.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
        }
        return null;
    }

返回的是上传pdf成功后的s_media_id，这个参数可以在本地存储，因为在后续的插卡接口中需要使用。