Spring Boot 1.5：在文件上传中接受“multipart/*”答案

【问题标题】：Spring Boot 1.5: accept "multipart/*" in file uploadSpring Boot 1.5：在文件上传中接受“multipart/*”
【发布时间】：2017-08-08 00:26:23
【问题描述】：

我的 Spring Boot 1.5.1 + Commons Fileupload 1.3.2 文件上传请求映射失败并显示 multipart/form-data。我的请求映射如下所示：

@RequestMapping(method=RequestMethod.POST, value="/api/users/uploads")
public @ResponseBody ResponseEntity<?> uploadUsers(
    @RequestParam(value="file", required=true) MultipartFile file
    ) throws IOException {
    String uploadFilename = file.getName();

    try(InputStream input = file.getInputStream()) {
        usersConverter.read(input);
    }

    return ResponseEntity.ok("Uploaded " + uploadFilename + " successfully.");
}

curl:

curl -v -u 'username:password'
     -H "Content-Type: multipart/mixed"
     -X POST -F file=@users.csv
     http://localhost:8080/api/users/uploads

工作正常：

*   Trying ::1...
* Connected to localhost (::1) port 8080 (#0)
* Server auth using Basic with user 'username'
> POST /api/users/uploads HTTP/1.1
> Host: localhost:8080
> Authorization: Basic cGFzc3dvcmQ=
> User-Agent: curl/7.42.1
> Content-Length: 8237
> Expect: 100-continue
> Content-Type: multipart/mixed; boundary=-------------------4c6cae60d33268be
> 
< HTTP/1.1 100 Continue
< HTTP/1.1 200 
< X-Content-Type-Options: nosniff
< X-XSS-Protection: 1; mode=block
< Cache-Control: no-cache, no-store, max-age=0, must-revalidate
< Pragma: no-cache
< Expires: 0
< X-Frame-Options: DENY
< Set-Cookie: JSESSIONID=8F80A63F1B83982DA1614ADD7BCB6C16;path=/;HttpOnly
< Content-Type: text/plain;charset=UTF-8
< Content-Length: 27
< Date: Thu, 16 Mar 2017 17:39:51 GMT
< 
* Connection #0 to host localhost left intact

但我有一些客户端发送multipart/form-data 而不是multipart/mixed，我希望这个请求映射能够同时处理这两个问题。我尝试将以下内容添加到@RequestMapping：

consumes="multipart/*"
consumes={"multipart/mixed", "multipart/form-data"
headers="content-type=multipart/*"
headers={"content-type=multipart/mixed", "content-type=multipart/form-data"}

但在每种情况下：

curl -v -u 'username:password'
     -H "Content-Type: multipart/form-data"
     -X POST -F file=@users.csv
     http://localhost:8080/api/users/uploads

以400 失败：

*   Trying ::1...
* Connected to localhost (::1) port 8080 (#0)
* Server auth using Basic with user 'username'
> POST /api/users/uploads HTTP/1.1
> Host: localhost:8080
> Authorization: Basic cGFzc3dvcmQ=
> User-Agent: curl/7.42.1
> Content-Length: 8237
> Expect: 100-continue
> Content-Type: multipart/form-data; boundary=-------------------85d8a22839d9bc08
> 
< HTTP/1.1 100 Continue
< HTTP/1.1 400 
< X-Content-Type-Options: nosniff
< X-XSS-Protection: 1; mode=block
< Cache-Control: no-cache, no-store, max-age=0, must-revalidate
< Pragma: no-cache
< Expires: 0
< X-Frame-Options: DENY
< Set-Cookie: JSESSIONID=1EB31D866907E49F0972F601E22317D0;path=/;HttpOnly
< Content-Length: 0
< Date: Thu, 16 Mar 2017 17:42:00 GMT
< Connection: close
< 
* Closing connection 0

我的 Angular 2.4 客户端发送 multipart/form-data 失败（可能相同）400。

任何想法如何让请求映射来处理multipart/form-data？

【问题讨论】：

尝试检查此链接spring upload file。也许你的卷曲是错误的。
@MatejMarconak -- curl 命令似乎是正确的；它适用于mixed，但不适用于form-data——这是两者之间的唯一区别。在这两种情况下，curl 都会添加所需的 boundary 值。我从非curl 客户端得到相同的400，它提供form-data 而不是mixed。
400: BAD REQUEST - 你可以尝试从 js 调用吗，因为 spring 定义看起来不错
查看我更新的问题，@MatejMarconak -- JS 客户端同样失败。
尝试将方法的参数更改为 - HttpServletRequest 请求、HttpServletResponse 响应，然后检查请求 ServletFileUpload.isMultipartContent(request) 的样子。

标签： java rest file-upload spring-boot apache-commons-fileupload

【解决方案1】：

呃 - 这是一个错误。移除 commons-fileupload 和 commons-io 依赖：

  <!-- 
  <dependency>
   <groupId>commons-fileupload</groupId>
   <artifactId>commons-fileupload</artifactId>
   <version>1.3.2</version>
  </dependency>

  <dependency>
   <groupId>commons-io</groupId>
   <artifactId>commons-io</artifactId>
   <version>2.4</version>
  </dependency>
  -->

并删除multipartResolver bean 定义：

    /*
    @Bean(name = "multipartResolver")
    public CommonsMultipartResolver multipartResolver() {
        CommonsMultipartResolver multipartResolver = new CommonsMultipartResolver();
        multipartResolver.setMaxUploadSize(100000);

        return multipartResolver;
    }
    */

然后请求映射对multipart/mixed 和multipart/form-data 都按预期工作......我的Angular 客户端也工作。

【讨论】：