RestTemplate 文件上传

private JSONObject upload(File file) {
    // url
    String uploadUrl = "https://yinji.gaoshan.co/api/gs-enterprise-admin/gs/file/upload";
    // 请求头参数
    HttpHeaders headers = new HttpHeaders();
    headers.setContentType(MediaType.MULTIPART_FORM_DATA);
    headers.setConnection("Keep-Alive");
    headers.setCacheControl("no-cache");
    headers.add("Authorization", "Bearer eyJhbGciOiJSUzI1NiIsInR5cCI6IkpXVCJ9.eyJ1c2VyX25hbWUiOiIxNTY1NTE4OTE5OCIsInNjb3BlIjpbImFsbCJdLCJpZCI6OCwiZXhwIjoxNjM5MTg5MTg1LCJhdXRob3JpdGllcyI6WyI2X-aZrumAmueUqOaItyJdLCJqdGkiOiIxOGRkMWY1MS02MzhhLTRlOGYtYjdlOS1hOGM1OGNmNDk2NzQiLCJjbGllbnRfaWQiOiJlbnRlcnByaXNlLWFkbWluLWFwcCJ9.aOC_mUnjPwbvD_7jY7TuiA4_WM0Kcuiuqc49yPP-kSfXr-x_P5UrBbjw7id8I849sNwoJB6tIyF6Hpwow_MOIlVX0ErECAlcNPOEJQ2eefrUcmEf-wQ9l5MV_k_j1l7ndC0j4m7GBwfrSde3CcZbWU6myd4CVG3_OF5nmUKRtcQ");
    // 封装请求 body
    FileSystemResource resource = new FileSystemResource(file);
    MultiValueMap<String, Object> form = new LinkedMultiValueMap<>();
    form.add("file", resource);
    HttpEntity<MultiValueMap<String, Object>> httpEntity = new HttpEntity<>(form, headers);
    // 发起请求
    ResponseEntity<JSONObject> responseEntity = restTemplate.postForEntity(uploadUrl, httpEntity, JSONObject.class);
    final JSONObject jsonObject = responseEntity.getBody();
    log.info("jsonObject : {} ", jsonObject);
    return jsonObject;
}