Spring Boot分段上传得到空文件对象 [英] Spring Boot multipart upload getting null file object

问题描述

使用spring boot 1.5.2实现多部分文件上传时出现问题。

这是情况，我有一个映射来处理文件上传过程。当我启动spring服务器时，它启动时没有任何错误。问题是我要么能够完美地上传文件，要么在FileBucket对象的所有属性上为null 。

如果我不关闭服务器，这种情况将永远保持。

• 如果可以上传，则会在剩下的时间内上传。
  
• 
  
• 
  $ b $如果不是这样，它将不会工作，直到我重新启动服务器（可能超过
  时间） b
  

  这是映射。

    @RequestMapping（value = {/ api / upload} ，method = RequestMethod.POST）
   public ResponseEntity< Map< String，Integer>>上传（@Valid FileBucket fileBucket，BindingResult结果）抛出IOException {
   Session session = sessionFactory.openSession（）; 
   User user =（User）session.load（User.class，getUserId（））; 
   
  地图< String，Integer> model = new HashMap< String，Integer>（）; 
   if（result.hasErrors（））{
   System.out.println（validation errors）; 
   System.out.println（result）; 
   session.close（）; 
  返回新的ResponseEntity<>（HttpStatus.INTERNAL_SERVER_ERROR）; 
  } else {
   int documentId = saveDocument（fileBucket，user）; 
   model.put（documentId，documentId）; 
   session.close（）; 
  返回新的ResponseEntity< Map< String，Integer>>（model，HttpStatus.OK）; 
   
   
   
   
   $ b $  FileBucket < code $> 
   
   
   
   $ private私人MultipartFile文件; 
   
   public MultiFile getFile（）{
   return file; 
  } 
   
   public void setFile（MultipartFile file）{
   this.file = file; 
   
   
   
   
   
   
  我已经尝试了很多方法来实现文件上传，仍然有相同的情况。使用 StandardServletMultipartResolver 。
   
   
   
   
   
    
   
   
    @Bean（name =multipartResolver）
   Standard StandardServletMultipartResolver解析器（）{
  返回新的StandardServletMultipartResolver （）; 
   
   $ / code $ / pre $使用 CommonsMultipartResolver  
   
   c> v1.3.2。 
   
   
    @Bean（name =multipartResolver）
   public CommonsMultipartResolver multipartResolver（）{
   CommonsMultipartResolver解析器= new CommonsMultipartResolver（）; 
   resolver.setMaxUploadSize（MAX_FILE_SIZE）; 
  返回解析器; 
   
    
  覆盖 MultipartFilter   
   
   
    @Bean 
   @Order（0）
   public MultipartFilter multipartFile（）{
   MultipartFilter multipartFilter = new MultipartFilter（）; 
   multipartFilter.setMultipartResolverBeanName（multipartResolver）; 
  返回multipartFilter; 
   
    
   
   
   
   
  启用 spring.http.multipart 在属性文件中
    spring.http.multipart.enabled = true 
   spring.http。 multipart.max-file-size = 20Mb 
   spring.http.multipart.max-request-size = 20Mb 
    
   
   
   
  我真的不知道从哪里开始寻找。问题偶尔会发生，但每次启动服务器时都不会发生这种情况，但大部分时间都是这样。希望有人能帮助我。 
   
   
   
  谢谢。
   
  解决方案
  我有同样的问题，是我的解决方案：
   
   
  在application.yml中： 
   
   
    spring： 
   http：
   multipart：
  启用：false 
    
   ：
   
   
    import org.springframework.web.multipart.MultipartResolver; 
   import org.springframework.web.multipart.commons.CommonsMultipartResolver; 
   ... 
   
   @Bean 
   public MultiResolver multipartResolver（）{
   return new CommonsMultipartResolver（）; 
   
   
   
   $ b在RestController中：
   
    
    pre $  @PostMapping（value =api / upload，consumes =multipart / form-data）
   public void enablePurchase（@RequestHeader HttpHeaders header，
   FileBucketConversation fileBucketConversation）{
   ... 
  } 
    
   重要： / strong> 
  在您的客户端中，请勿使用任何标题来定义内容类型或边界。我使用的是Angular 4，当我从代码中删除这些头文件时，它可以工作（我只设置了用户令牌）：
   
   pre $  / *不要使用这个：
  让boundary =ABDCE; 
   headers.append（Content-type，multipart / form-data; boundary =+ boundary）; 
   headers.append（enctype，multipart / form-data; boundary =+ boundary）; 
   headers.append（boundary，boundary）; 
   * / 
    

  我希望这可以帮到您。


  I am getting a problem while implementing multipart file upload using spring boot 1.5.2.

  Here is the situation, I have a mapping to handle file upload process.While I start the spring server, it starts without any error. The problem is that I would either able to upload the file perfectly fine or I would get null on all attribute in FileBucket object.

  This situation would stay forever if I do not shutdown the server.

  • If it could upload, it would upload fine for the rest of the time.
  • If not, it won't work until I restart the server(likely more than one time)

  Here is the mapping.

  @RequestMapping(value = {"/api/upload"}, method = RequestMethod.POST)
  public ResponseEntity<Map<String, Integer>> upload(@Valid FileBucket fileBucket, BindingResult result) throws IOException {
          Session session = sessionFactory.openSession();
          User user = (User) session.load(User.class, getUserId());
  
          Map<String, Integer> model = new HashMap<String, Integer>();
          if (result.hasErrors()) {
              System.out.println("validation errors");
              System.out.println(result);
              session.close();
              return new ResponseEntity<>(HttpStatus.INTERNAL_SERVER_ERROR);
          } else {
              int documentId = saveDocument(fileBucket, user);
              model.put("documentId", documentId);
              session.close();
              return new ResponseEntity<Map<String, Integer>>(model, HttpStatus.OK);
          }
  }
  

  And the FileBucket object

  public class FileBucketConversation {
  
      private MultipartFile file;
  
      public MultipartFile getFile() {
          return file;
      }
  
      public void setFile(MultipartFile file) {
          this.file = file;
      }
  }
  

  I have tried few ways to implement file upload, and still having the same situation.

  1. Using StandardServletMultipartResolver.

     @Bean(name = "multipartResolver")
     public StandardServletMultipartResolver resolver() {
         return new StandardServletMultipartResolver();
     }
     

  2. Using CommonsMultipartResolver v1.3.2.

     @Bean(name="multipartResolver")
     public CommonsMultipartResolver multipartResolver () {
         CommonsMultipartResolver resolver = new CommonsMultipartResolver();
         resolver.setMaxUploadSize(MAX_FILE_SIZE);
         return resolver;
     }
     

     overriding MultipartFilter

     @Bean
     @Order(0)
     public MultipartFilter multipartFile() {
         MultipartFilter multipartFilter = new MultipartFilter();
         multipartFilter.setMultipartResolverBeanName("multipartResolver");
         return multipartFilter;
     }
     

  3. Enable spring.http.multipart in properties file

     spring.http.multipart.enabled=true
     spring.http.multipart.max-file-size=20Mb
     spring.http.multipart.max-request-size=20Mb
     

  I really have no clue where to start looking. The problem happen occasionally, it do not happen every time I start the server but most of the time. Hoping some one could help me.

  Thank you.

  解决方案

  I had the same problem, this is my solution:

  In application.yml:

  spring:
    http:
      multipart:
        enabled: false
  

  In configuration:

  import org.springframework.web.multipart.MultipartResolver;
  import org.springframework.web.multipart.commons.CommonsMultipartResolver;
  ...
  
  @Bean
  public MultipartResolver multipartResolver() {
      return new CommonsMultipartResolver();
  }
  

  In RestController:

  @PostMapping(value = "api/upload", consumes = "multipart/form-data") 
  public void enablePurchase(@RequestHeader HttpHeaders headers,
                             FileBucketConversation fileBucketConversation) {
  ...
  }
  

  Important: In your client don't use any header to define the Content-type or boundary. I'm using Angular 4 and when I remove these headers from my code it works (I only set the User token):

  /* DON'T USE THIS:
  let boundary = "ABDCE";
  headers.append("Content-type", "multipart/form-data;boundary=" + boundary);
  headers.append("enctype", "multipart/form-data;boundary=" + boundary);
  headers.append("boundary", boundary);
  */
  

  I hope this help you.

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