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前台的实现我们可以参考

图片上传地址:

/** 上传图片素材*/    public static final String URL_UPLOAD = "https://api.weixin.qq.com/cgi-bin/material/add_material?type=image&access_token=token"

后台部分我们可以在后面进行添加

@PostMapping("/uploadImages")@ResponseBodypublic String uploadImages(HttpServletRequest request,MultipartFile file){    try{        String filename = file.getOriginalFilename();        //上传的路径        String path = "d:\\upload";        filename = changeName(filename);        String rappendix = "upload/" + filename;        filename = path + File.separator + filename;        File file1 = new File(filename);        file.transferTo(file1);        String str = "{\"src\":\"" + rappendix + "\"}";        //将本地的路径上传到服务器上        String imgUrl = WxCardUtil.postFile(UrlConstant.URL_UPLOAD, filename);        //将返回的imgUrl保存到数据库中        imgService.save(imgUrl);        return str;    }catch (Exception e){        e.printStackTrace();        throw new AuthorizationException("上传文件失败");    }}

向微信服务器发起请求postFile方法：

/* * 调微信接口上传永久图片 */public static String postFile(String url, String filePath) throws IOException {    File file = new File(filePath);    if (!file.exists()) {        throw new IOException("文件不存在");    }    String result = null;    try {        URL url1 = new URL(url);        // 连接        HttpURLConnection conn = (HttpURLConnection) url1.openConnection();        /**         * 设置关键值         */        conn.setConnectTimeout(5000);        conn.setReadTimeout(30000);        conn.setDoOutput(true);        conn.setDoInput(true);        conn.setUseCaches(false);  // post方式不能使用缓存        conn.setRequestMethod("POST");  // 以Post方式提交表单，默认get方式        // 设置请求头信息        conn.setRequestProperty("Connection", "Keep-Alive");        conn.setRequestProperty("Cache-Control", "no-cache");        // 设置边界        String boundary = "-----------------------------" + System.currentTimeMillis();        conn.setRequestProperty("Content-Type", "multipart/form-data; boundary=" + boundary);        // 请求正文信息        OutputStream output = conn.getOutputStream();        output.write(("--" + boundary + "\r\n").getBytes());        output.write(                String.format("Content-Disposition: form-data; name=\"media\"; filename=\"%s\"\r\n", file.getName())                        .getBytes());        output.write("Content-Type: image/jpeg \r\n\r\n".getBytes());        byte[] data = new byte[1024];        int len = 0;        FileInputStream input = new FileInputStream(file);        while ((len = input.read(data)) > -1) {            output.write(data, 0, len);        }        output.write(("\r\n--" + boundary + "\r\n\r\n").getBytes());        output.flush();        output.close();        input.close();        InputStream resp = conn.getInputStream();        StringBuffer sb = new StringBuffer();        while ((len = resp.read(data)) > -1)            sb.append(new String(data, 0, len, "utf-8"));        resp.close();        result = sb.toString();        //System.out.println(result);    } catch (ClientProtocolException e) {        log.error("postFile，不支持http协议", e);    } catch (IOException e) {        log.error("postFile数据传输失败", e);    }    System.out.println(result);    //将字符串转换成jsonObject对象    JSONObject jsonObject = JSONObject.fromObject(result);    String imgurl = jsonObject.getString("url");    log.info(imgurl);    return imgurl;}

结果如下:

上传之后我们可以在微信公众号的素材管理中看到