Spring Boot多部分上传获取空文件对象

Question

null

下面是映射。

@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);
        }
}

和FileBucket对象

public class FileBucketConversation {

    private MultipartFile file;

    public MultipartFile getFile() {
        return file;
    }

    public void setFile(MultipartFile file) {
        this.file = file;
    }
}

我尝试了几种实现文件上传的方法，仍然有同样的情况。

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

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

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

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

谢谢你。

Answer 1

我也有同样的问题，这是我的解决方案：

在application.yml中：

spring:
  http:
    multipart:
      enabled: false

在配置中：

import org.springframework.web.multipart.MultipartResolver;
import org.springframework.web.multipart.commons.CommonsMultipartResolver;
...

@Bean
public MultipartResolver multipartResolver() {
    return new CommonsMultipartResolver();
}

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

/* 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);
*/