使用Commons Multiparthttpservlet解析器上传文件

Question

我在Spring Boot和Reactjs的前端提供了服务，但是我的服务没有提供任何东西（没有结果）

我正在上传带有文件图像或音频的表单数据，但我的休息服务处没有收到任何文件。

我的服务等级：

@CrossOrigin
    @RequestMapping(value = "/uploadFile", method = RequestMethod.POST)
    public ServiceResponse save(MultipartHttpServletRequest request)
    {
        String event_name=request.getParameter("event_name");   

        logger.debug("event name: "+event_name);
        logger.debug("Has a file :"+request.getFileNames().hasNext()); // getting false
        if(request.getFileNames().hasNext()) {
           // Working here
            try{}
            catch(Exception e){
              return ServiceResponse.createFailureResponse("Request 
              failed!");
             }      
            }
        return ServiceResponse.createSuccessResponse();


    }

需要依赖项：

     <dependency>
        <groupId>commons-fileupload</groupId>
        <artifactId>commons-fileupload</artifactId>
        <version>1.3.3</version>
    </dependency>

创建的Bean：

@Configuration
@ComponentScan
@EntityScan("com.mphasis.springreact.services.admin")
@EnableJpaRepositories("com.mphasis.springreact.services.admin")
@PropertySource("classpath:config.properties")
public class DBConfiguration {

    public DBConfiguration() {

    }

    @Bean
        public JdbcTemplate jdbcTemplate(DataSource dataSource)
        {
            return new JdbcTemplate(dataSource);
        }

    @Bean
    public DataSource dataSource() {
        DriverManagerDataSource dataSource = new DriverManagerDataSource();
        dataSource.setDriverClassName("org.postgresql.Driver");
        dataSource.setUrl("jdbc:postgresql://localhost:5432/DummyApp");
        dataSource.setUsername("postgres");
        dataSource.setPassword("root");     
        return dataSource;
    }

    @Bean(name = "multipartResolver")
    public CommonsMultipartResolver createMultipartResolver() {
        CommonsMultipartResolver resolver=new CommonsMultipartResolver();
        resolver.setDefaultEncoding("utf-8");
        return resolver;
    }

    @Bean
    public MultipartResolver filterMultipartResolver()
    {
        return new StandardServletMultipartResolver();
    }

     @Bean
        public static PropertySourcesPlaceholderConfigurer propertySourcesPlaceholderConfigurer() {
            return new PropertySourcesPlaceholderConfigurer();
      } 

}

这是我的前端部分，尽管服务本身不起作用：

 var blob = new Blob(this.state.chunks, {type: 'audio/mp3;codec=opus'});

    var formData=new FormData();

    formData.append("event_name",event);
    formData.append("file",new File([blob], event, {type: 'audio/mp3;codec=opus', lastModified: Date.now()}));
     fetch('http://localhost:6020/uploadFile', {
    method: "POST", 
    mode: "cors", 
    cache: "no-cache", 

    redirect: "follow", 
    referrer: "no-referrer", 
    body: formData, 
    })
    .then(response => response.json())
    .then(function(data){ console.log( JSON.stringify( data ) ) });

自从我进行休息呼叫以来，我一直未在服务类中错过网络依赖，因此我猜我不需要它，但是在大多数教程中，都提到它可以用于多部分文件