java后台如何获取前台FormData数据

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servlet

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@RequestMapping(value = "/json/uploadAvatar.json", method = RequestMethod.POST)
@ResponseBody
public String uploadAvatar(@RequestParam("croppedImage") MultipartFile file) {
try {
InputStream content = file.getInputStream();
String properties = "aliyun-oss.properties";
String filepath = userSitesService.uploadAvatar(properties, content);
} catch (Exception ex) {

    }
    return null;
}

<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"/>