/** * Build a multipart (file uploading) request body with the given form parameters, * which could contain text fields and file fields. * * @param formParams Form parameters in the form of Map * @return RequestBody */ public RequestBody buildRequestBodyMultipart(Map<String, Object> formParams) { MultipartBuilder mpBuilder = new MultipartBuilder().type(MultipartBuilder.FORM); for (Entry<String, Object> param : formParams.entrySet()) { if (param.getValue() instanceof File) { File file = (File) param.getValue(); Headers partHeaders = Headers.of("Content-Disposition", "form-data; name=\"" + param.getKey() + "\"; filename=\"" + file.getName() + "\""); MediaType mediaType = MediaType.parse(guessContentTypeFromFile(file)); mpBuilder.addPart(partHeaders, RequestBody.create(mediaType, file)); } else { Headers partHeaders = Headers.of("Content-Disposition", "form-data; name=\"" + param.getKey() + "\""); mpBuilder.addPart(partHeaders, RequestBody.create(null, parameterToString(param.getValue()))); } } return mpBuilder.build(); }