方式一：HttpClient

public static String uploadFile(String url, Map<String, FileWrapper> fileParam, Map<String,String> otherParam){long start = System.currentTimeMillis();log.info("uploadFile url: {}.",url);HttpClient client = HttpClients.createDefault();HttpPost post = new HttpPost(url);//设置参数post.setProtocolVersion(HttpVersion.HTTP_1_1);RequestConfig requestConfig = RequestConfig.custom().setConnectTimeout(CONN_TIMEOUT).setSocketTimeout(READ_TIMEOUT).build();post.setConfig(requestConfig);try {ContentType contentType = ContentType.create("multipart/form-data", StandardCharsets.UTF_8);MultipartEntityBuilder builder = MultipartEntityBuilder.create().setMode(HttpMultipartMode.RFC6532).setCharset(StandardCharsets.UTF_8).setContentType(contentType);//添加文件参数for (Map.Entry<String, FileWrapper> fileWrapperEntry : fileParam.entrySet()) {String k = fileWrapperEntry.getKey();FileWrapper v = fileWrapperEntry.getValue();log.info("fileName: {}, fileMd5: {}",k, MD5Util.md5(FileUtils.readFileToByteArray(v.getFile())));builder.addPart(k,new FileBody(v.getFile(),contentType, v.getFileName()));}//添加其他参数if (MapUtils.isNotEmpty(otherParam)){otherParam.forEach((k,v) -> builder.addTextBody(k,v,contentType));}// 设置请求实体post.setEntity(builder.build());HttpResponse response = client.execute(post);return EntityUtils.toString(response.getEntity(),StandardCharsets.UTF_8);} catch (Exception e) {log.error("uploadFile fail. url: {}",url,e);throw new RuntimeException("uploadFile exception ", e);}finally {log.info("uploadFile cost {}ms",System.currentTimeMillis()-start );}}public static class FileWrapper{private File file;private String fileName;private String contentType;public FileWrapper() {}public FileWrapper(File file, String fileName, String contentType) {this.file = file;this.fileName = fileName;this.contentType = contentType;}public File getFile() {return file;}public void setFile(File file) {this.file = file;}public String getFileName() {return fileName;}public void setFileName(String fileName) {this.fileName = fileName;}public String getContentType() {return contentType;}public void setContentType(String contentType) {this.contentType = contentType;}}

方式二：RestTemplate

public String uploadFile(byte[] fileData, String fileName, LocalDateTime time) {//构建请求头HttpHeaders headers = new HttpHeaders();MediaType type = MediaType.parseMediaType("multipart/form-data");headers.setContentType(type);headers.setContentLength(fileData.length);headers.setContentDispositionFormData("media", fileName);DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyyMMddHH");String format = time.format(formatter);String date = format.substring(0, 8);String hourPart = format.substring(8, 10);//构建请求体MultiValueMap<String, Object> parts = new LinkedMultiValueMap<>();ByteArrayResource fileAsResource = new ByteArrayResource(fileData){@Overridepublic String getFilename() {return fileName;}@Overridepublic long contentLength() {return fileData.length;}};//其他参数parts.add("file", fileAsResource);parts.add("fileName", fileName);parts.add("date", date);parts.add("hour", hourPart);parts.add("fileType", config.getFileType());parts.add("businessType", config.getBusinessType());HttpEntity<MultiValueMap<String, Object>> formEntity = new HttpEntity<>(parts, headers);//发送post请求上传文件ResponseEntity<String> responseEntity = restTemplate.postForEntity(config.getUrl() + "/uploadFile", formEntity, String.class);JSONObject response= JSONObject.parseObject(responseEntity.getBody());if (response!= null && Integer.parseInt(response.get("code").toString()) == 0) {//得到存储地址return (String) response.get("path");} else {log.error("response is null and file name is {}", fileName);return "";}}