Question

标题可能看起来很常见，但它们都不适合我的问题。

我有一个休息服务，它接受普通参数和多部分形式的文件。

我想使用resttemplate将数据和文件发送到上述休息服务。

直到我发送正常的字符串数据时没有问题。一旦我添加了发送字节的代码，我就开始收到 400 Bad request error。

如果我评论代码发送ByteArrayResource，那么它就开始正常参数。

下面是示例代码

休息服务控制器

@RestController
@RequestMapping(value="/ticket")
public class UserTicketController {

 @RequestMapping(value="/createTicket.do",method={RequestMethod.POST},
        consumes = {MediaType.MULTIPART_FORM_DATA_VALUE},headers={"content-type="+MediaType.MULTIPART_FORM_DATA_VALUE})
public void createTicket(@ModelAttribute ServiceDeskRequest serviceDeskRequest, HttpServletRequest request,HttpServletResponse response) throws Exception{

 }

 }

Servicedeskrequest模型属性是

 public class ServiceDeskRequest implements Serializable{


private String jsonData;
private MultipartFile attachment;
}

应用context.xml中

 <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
</bean>

客户端代码

RestTemplate restTemplate = new RestTemplate();
        MultiValueMap<String, Object> requestParamerterMap = new LinkedMultiValueMap<String, Object>();

        requestParamerterMap.add("jsonData", jsonData);
        MultipartFile attachment = userRequest.getAttachment();

        if(attachment!=null && attachment.getOriginalFilename()!=null) {
            ByteArrayResource byteArrayResource = new ByteArrayResource(attachment.getBytes(), attachment.getOriginalFilename());
            requestParamerterMap.add("attachment", byteArrayResource);
        }

        HttpHeaders headers = new HttpHeaders();
        headers.setContentType(MediaType.MULTIPART_FORM_DATA);

        HttpEntity<MultiValueMap<String, Object>> requestEntity = new HttpEntity<MultiValueMap<String, Object>>(requestParamerterMap, headers);


        String response = restTemplate.postForObject(targetUrl, requestEntity, String.class);

Answer 1

我明白了。这个难题有两个部分。服务代码没有变化。

提供正确的转换器来重新模板。在默认转换列表中，spring不会添加FormHttpMessageConverter。

    FormHttpMessageConverter converter = new FormHttpMessageConverter();

    RestTemplate restTemplate = new RestTemplate();
    restTemplate.getMessageConverters().add(converter);

覆盖bytearrayresource类。请注意，您需要覆盖 getFilename 方法，以便在服务端接收文档名称。

     public class MultipartByteArrayResource extends ByteArrayResource{

     private String fileName;

      public MultipartByteArrayResource(byte[] byteArray) {
             super(byteArray);
         }

      public String getFilename() { 
          return fileName; 
        }

      public void setFilename(String fileName) {
          this.fileName= fileName;
       }

   }

经过上述更改后，客户端代码将

       FormHttpMessageConverter converter = new FormHttpMessageConverter();

        RestTemplate restTemplate = new RestTemplate();
        restTemplate.getMessageConverters().add(converter);

        MultiValueMap<String, Object> requestParamerterMap = new LinkedMultiValueMap<String, Object>();

        requestParamerterMap.add("jsonData", jsonData);

        MultipartFile attachment = userRequest.getAttachment();

        if(attachment!=null && attachment.getOriginalFilename()!=null) {
            //ByteArrayResource byteArrayResource = new ByteArrayResource(attachment.getBytes(), attachment.getOriginalFilename());

            MultipartByteArrayResource resource = new MultipartByteArrayResource(attachment.getBytes());

           //pass file name sepratly 
           resource.setFilename(attachment.getOriginalFilename());

            requestParamerterMap.add("attachment", resource);
        }

        HttpHeaders headers = new HttpHeaders();
        headers.setContentType(MediaType.MULTIPART_FORM_DATA);

        HttpEntity<MultiValueMap<String, Object>> requestEntity = new HttpEntity<MultiValueMap<String, Object>>(requestParamerterMap, headers);

        String response = restTemplate.postForObject(targetUrls.get("sdCreateTicketsUrl"), requestEntity, String.class);

Answer 2

首先，value="/createTicket.do"远离REST约定。同样适用于/ticket。应通过POST到URL来创建故障单：.../tickets/

通过resttemplate在spring rest服务上发送文件

2 个答案: