JAVA RestTemplate MultipartFile多

1、GET请求

  /**
     * GET请求 - 获取Token
     *
     * @return java.lang.String
     */
    public String getToken() {
        String token = null;
        JSONObject result;
        try {
            String requestUrl = "xxx?client_id=" + clientId + "&client_secret=" + clientSecret;
            ResponseEntity<String> entity = restTemplate.getForEntity(requestUrl, String.class);
            log.info("请求返回=========={}", entity.getBody());
            result = JSONObject.parseObject(entity.getBody());
            if ("200".equals(result.getString("resCode"))) {
                JSONObject data = JSONObject.parseObject(result.getString("data"));
                token = data.getString("access_token");
            } else {
                log.info("请求TOKEN错误=========={}", result);
            }
        } catch (Exception e) {
            log.error("请求TOKEN异常=========={}", e.getMessage());
        }
        return token;
    }

2、POST请求

  /**
     * POS请求
     *
     * @param dto 传参
     * @return JSONObject
     */
    public JSONObject doPost(ExpenseDeleteDTO dto) {
        JSONObject result;
        try {
            String requestUrl = "xxx";
            HttpHeaders headers = new HttpHeaders();
            headers.setContentType(MediaType.APPLICATION_JSON);
            headers.add("branch_code", dto.getBranchCode());
            headers.add("user_code", dto.getUserCode());
            headers.add("system_type", systemType);
            headers.add("token", dto.getToken());

            HttpEntity<Object> request = new HttpEntity<>(dto, headers);
            ResponseEntity<String> entity = restTemplate.postForEntity(requestUrl, request, String.class);
            log.info("请求返回=========={}", entity.getBody());
            result = JSONObject.parseObject(entity.getBody());
        } catch (Exception e) {
            log.error("请求异常=========={}", e.getMessage());
        }
        return result;
    }

3、POST请求 附带MultipartFile

  /**
     * POST请求
     *
     * @param token token
     * @param files 多个文件
     * @return JSONObject
     */
    public JSONObject doPostUpload(String token, List<MultipartFile> files) {
        JSONObject result;
        try {
            String requestUrl = "xxx";
            HttpHeaders headers = new HttpHeaders();
            // 如果是文件，使用MULTIPART_FORM_DATA
            headers.setContentType(MediaType.MULTIPART_FORM_DATA);
            headers.add("token", token);

            MultiValueMap<String, Object> params = new LinkedMultiValueMap<>();
            for (MultipartFile file : files) {
                ByteArrayResource byteArrayResource = new ByteArrayResource(file.getBytes()) {
                    @Override
                    public long contentLength() {
                        return file.getSize();
                    }

                    @Override
                    public String getFilename() {
                        return file.getOriginalFilename();
                    }
                };
                params.add("files", byteArrayResource);
            }

            // 参数和请求头放到请求体
            HttpEntity<Object> request = new HttpEntity<>(params, headers);
            ResponseEntity<String> entity = restTemplate.postForEntity(requestUrl, request, String.class);
            log.info("请求返回=========={}", entity.getBody());
            result = JSONObject.parseObject(entity.getBody());
        } catch (Exception e) {
            log.error("请求上传OCR发票异常=========={}", e.getMessage());
        }
        return result;
    }

POSTMAN测试