弹簧 - 休息模板 - 使用文件输入流和其他原始数据上传文件

Question

我知道这已经讨论了很多次，我在Google/Stackoverflow上搜索了很多，但似乎无法让它工作。

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），并创建一个类型为FileUploadRequest的POJO对象。完整的数据（文件+文本字段）必须原样传递给另一个服务（第三方服务）进行上传。

我正在使用Spring REST模板连接到第三方服务。以下是在代码段：

RestTemplate初始化（爪哇配置）

@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类：

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，当我跑我的申请，我得到以下错误：

Caused by: java.lang.UnsupportedOperationException: getBody not supported at org.springframework.http.client.HttpComponentsStreamingClientHttpRequest.getBodyInternal(HttpComponentsStreamingClientHttpRequest.java:84) at org.springframework.http.client.AbstractClientHttpRequest.getBody(AbstractClientHttpRequest.java:47) at org.springframework.http.converter.FormHttpMessageConverter.writeMultipart(FormHttpMessageConverter.java:299) at org.springframework.http.converter.FormHttpMessageConverter.write(FormHttpMessageConverter.java:238) at org.springframework.http.converter.FormHttpMessageConverter.write(FormHttpMessageConverter.java:87) at org.springframework.web.client.RestTemplate$HttpEntityRequestCallback.doWithRequest(RestTemplate.java:777) at org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:566) at org.springframework.web.client.RestTemplate.execute(RestTemplate.java:529) at org.springframework.web.client.RestTemplate.exchange(RestTemplate.java:447)

请让我知道它是什么，我的思念，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！

Answer 1

所以，看起来像我解决了它。这个问题是由于Spring 4.1.1发行版上的一个错误。它在4.2.0中得到解决 将pom依赖改为使用4.2.0，现在它工作正常。

Answer 2

使用Spring Web的MultipartFile，然后在控制器中使用@RequestParam("file") MultipartFile file作为参数。然后，您将可以访问该流以及上传时附带的所有其他属性。