话不多说，看代码

1，客户端调用代码

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@PostMapping("/uploadAttachBase64")
public Result uploadAttachBase64(HttpServletRequest request, @RequestParam(value = "file",required = false) MultipartFile file,
                                 @RequestParam(value = "orgId",required = false) String orgId) throws IOException {
    //  校验登录
    Map<String,Object> params = this.getLoginInfoMap(request);
    if(StringUtils.isEmpty(orgId) || orgId.equals("")){
        return Result.error("入参为空");
    }
    if(ObjectUtils.isEmpty(file) || file.getSize() <=0 ){
        return Result.error("上传文件为空");
    }
    MultiValueMap valueMap = new LinkedMultiValueMap(1);
    // 此处从multipartFile获取byte[],如果是上传本地文件可以使用io获取byte[]
    ByteArrayResource is = new ByteArrayResource(file.getBytes()) {
        @Override
        public String getFilename() {
            return file.getOriginalFilename();
        }
    };
    valueMap.add("file", is);
    valueMap.add("orgId",orgId);
    String s = null;
    RestTemplate restTemplate = new RestTemplate();
    try {
        s = restTemplate.postForObject(asiaInfoUrl + uploadAttachBase64, valueMap, String.class);
    } catch (RestClientException e) {
        e.printStackTrace();
    }
    return Result.success(JSONObject.parseObject(s));
}
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2，服务端接口

 

参考：https://blog.csdn.net/qq_32513795/article/details/107958713