我正在将Java Web应用程序转换为Spring框架,并希望在处理文件上传时得到一些建议。原始代码是使用org.apache.commons.fileupload编写的。
Does Spring MultipartFile wraps org.apache.commons.fileupload or I can exclude this dependency from my POM file?
I have seen following example:
@RequestMapping(value = "/form", method = RequestMethod.POST) public String handleFormUpload(@RequestParam("file") MultipartFile file) { if (!file.isEmpty()) { byte[] bytes = file.getBytes(); // store the bytes somewhere return "redirect:uploadSuccess"; } else { return "redirect:uploadFailure"; } }
Originally I tried to follow this example but was always getting an error as it couldn't find this request param. So, in my controller I have done the following:
@RequestMapping(value = "/upload", method = RequestMethod.POST) public @ResponseBody ExtResponse upload(HttpServletRequest request, HttpServletResponse response) { // Create a JSON response object. ExtResponse extResponse = new ExtResponse(); try { if (request instanceof MultipartHttpServletRequest) { MultipartHttpServletRequest multipartRequest = (MultipartHttpServletRequest) request; MultipartFile file = multipartRequest.getFiles("file"); InputStream input = file.getInputStream(); // do the input processing extResponse.setSuccess(true); } } catch (Exception e) { extResponse.setSuccess(false); extResponse.setMessage(e.getMessage()); } return extResponse; }
现在它已经可以运行了。如果有人能告诉我为什么@RequestParam对我不起作用,我将不胜感激。顺便说一句,我确实有
<bean id="multipartResolver"
class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
<property name="maxUploadSize" value="2097152"/>
</bean>
在我的servlet上下文文件中。
commons-fileupload
的依赖。然而,Spring Cloud Open Feign将通过org.springframework.cloud:spring-cloud-openfeign-core
引入此依赖。 - Krzysztof Tomaszewski