使用DispatcherServlet后MultipartFile接收不到文件

Question

使用DispatcherServlet

@Configuration
public class WebConfig {   
    @Bean
    public ServletRegistrationBean apiV1ServletBean(WebApplicationContext wac) {
        DispatcherServlet ds = new DispatcherServlet(wac);
        ServletRegistrationBean bean = new ServletRegistrationBean(ds, "/*");
        bean.setName("xxx");
       bean.addUrlMappings("/xxx/*");
       return bean;
   }

}

MultipartFile接收不到文件
@RequestMapping(method = RequestMethod.POST)
    public Response<String> site(@RequestParam("file") MultipartFile file, String userId, HttpServletRequest request) {

}

错误报告：
Required request part 'file' is not present

Answer 1

我今天刚好遇到这个问题，研究解决了。 这个因为你自己注入的ServletRegistrationBean跟spring boot默认注入的ServletRegistrationBean的配置不一样。你自己注入的ServletRegistrationBean默认没有配置处理上传请求的。 请参考以下配置： //自动注入spring boot默认的上传配置 @Autowired private MultipartConfigElement multipartConfigElement; @Bean public ServletRegistrationBean apiV1ServletBean(WebApplicationContext wac) { DispatcherServlet servlet = new DispatcherServlet(wac); ServletRegistrationBean bean = new ServletRegistrationBean(servlet, "/api/*"); //注入上传配置到自己注册的ServletRegistrationBean bean.setMultipartConfig(multipartConfigElement); bean.setName("ApiServlet"); return bean; }

Answer 2

确定参数名称"file"对吗？试下这样，我是这样用的没问题。 List<String> imgUrls=new ArrayList<>(); MultipartHttpServletRequest multipartRequest =(MultipartHttpServletRequest) request; List<MultipartFile> files=multipartRequest.getFiles("file"); 再加上前端的 <form action="/upload" method="post" enctype="multipart/form-data"> <input type="file" name="file" multiple> <input type="submit" "> </form>

Answer 3

var formData = new FormData(); formData.append('file', $('#****')[0].files[0]);