SPRING - REST模板 - 使用文件输入流和其他原始数据上传文件

我知道这已经讨论了很多次了，我在Google / Stackoverflow上搜索了很多，但似乎无法让它运行起来 .

我有一个Spring MVC Web应用程序，JSP发送媒体文件和一些文本字段，控制器捕获输入流和其他表单数据（一些文本字段），并创建一个FileUploadRequest类型的POJO对象 . 必须将完整数据（文件文本字段）原样传递给另一个服务（第三方服务）以进行上载 .

我使用Spring REST模板连接到第三方服务 . 以下是代码段：

RestTemplate初始化（Java配置）

@Bean
public ClientHttpRequestFactory httpRequestFactory() {
    final HttpComponentsClientHttpRequestFactory requestFactory = new HttpComponentsClientHttpRequestFactory(httpClient());
    requestFactory.setBufferRequestBody(false);
    return requestFactory;
}

@Bean
public RestTemplate getRestTemplate() {
    final RestTemplate restTemplate = new RestTemplate();
    restTemplate.setRequestFactory(httpRequestFactory()); // apache http library
    restTemplate.setMessageConverters(getMessageConverters());
}


private List<HttpMessageConverter<?>> getMessageConverters() {
    final List<HttpMessageConverter<?>> converters = new ArrayList<HttpMessageConverter<?>>();
    final FormHttpMessageConverter e = new FormHttpMessageConverter();
    e.addPartConverter(new MappingJackson2HttpMessageConverter());
    converters.add(e);
    return converters;
}

@Bean
public CommonsMultipartResolver multipartResolver() {
    final CommonsMultipartResolver commonsMultipartResolver = new CommonsMultipartResolver();
    return commonsMultipartResolver;
}

控制器代码：

public APPResponse uploadFile(final HttpServletRequest request) {
    final FileUploadRequest uploadRequest = new FileUploadRequest();
    final List<FileItem> items = new ServletFileUpload(new DiskFileItemFactory()).parseRequest(request);
    for (final FileItem item : items) {
         if (item.isFormField()) {
             String fieldValue = item.getString();
             uploadRequest.setEnabled(Boolean.valueOf(fieldValue));
         } else {
             String fileName = FilenameUtils.getName(item.getName());
             InputStream fileContent = item.getInputStream();
             uploadRequest.setFileName(fileName);
             uploadRequest.setFileStream(fileContent);
         }
    }
    uploadFileToService(uploadRequest); 
}

POJO课程：

public class FileUploadRequest {
    private String fileName;
    private InputStream fileStream;
    private boolean enabled;
    // getter setters...
}

uploadFileToService方法实现

public FileUploadResponse uploadFileToService(final FileUploadRequest uploadRequest) {
    final HttpHeaders headers = new HttpHeaders();
    headers.setContentType(MediaType.MULTIPART_FORM_DATA);

    final String url = <URL where the file is to passed as is>;
    MultiValueMap<String, Object> parameters = new LinkedMultiValueMap<String, Object>();
    parameters.set("Content-Type","multipart/form-data");
    parameters.add("file", uploadRequest.getFileStream());
    parameters.add("someOtherParam", uploadRequest.isEnabled());

    final HttpEntity<MultiValueMap<String, Object>> httpEntity = new HttpEntity<MultiValueMap<String, Object>>(
            parameters, headers);
    final ResponseEntity<T> exchange = template.exchange(url,
                HttpMethod.POST, httpEntity, FileUploadResponse.class);
}

现在，当我运行我的应用程序时，我收到以下错误：

引起：java.lang.UnsupportedOperationException：org.springframework.http.client.HttpComponentsStreamingClientHttpRequest.getBodyInternal（HttpComponentsStreamingClientHttpRequest.java:84）org.springframework.http.client.AbstractClientHttpRequest.getBody（AbstractClientHttpRequest.java:47）不支持getBody ）org.springframework.http.converter.FormHttpMessageConverter.writeMultipart（FormHttpMessageConverter.java:299）org.springframework.http.converter.FormHttpMessageConverter.write（FormHttpMessageConverter.java:238）at org.springframework.http.converter.FormHttpMessageConverter . 在Org.springframework.web.client.RestTemplate $ HttpEntityRequestCallback.doWithRequest（RestTemplate.java:777）中的org.springframework.web.client.RestTemplate.doExecute（RestTemplate.java:566）写一下（FormHttpMessageConverter.java:87） .springframework.web.client.RestTemplate.execute（RestTemplate.java:529）org.springframework.web.client.RestTemplate.exchange（RestTemplate.java:447）

请让我知道我错过了什么，我无法弄清楚这个问题 .

如果需要进一步的细节，我可以分享

谢谢！！