下面是文件接收的方法，其中List<FileItem> items为空，获取不到上传文件。
@RequestMapping(value = "/imagedetect", method = { RequestMethod.POST})
@ResponseBody
public Object imagedetect(ModelMap model, HttpServletResponse response) throws IOException {
logger.info("检测任务开始====" + DateUtil.getCurrentTime());
HttpServletRequest request=CommonUtil.getRequest();
String access_token = request.getParameter("access_token");
String url = request.getParameter("image");
String tag = request.getParameter("tag");
Object obj = new Object();
//判断该请求是否有上传文件
if(ServletFileUpload.isMultipartContent(request))
{
FileItemFactory factory = new DiskFileItemFactory();
ServletFileUpload upload = new ServletFileUpload(factory);
try {
List<FileItem> items = upload.parseRequest(request);
for(FileItem item: items)
{
}
} catch (FileUploadException e) {
e.printStackTrace();
}
}else{
}
}
经过查找资料，分析后，发现在springmvc的配置文件中有这样一段代码：
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<bean id=
"multipartResolver"
class
=
"org.springframework.web.multipart.commons.CommonsMultipartResolver"
>
<property name=
"defaultEncoding"
value=
"UTF-8"
/>
<property name=
"maxUploadSize"
value=
"104857600"
/>
<property name=
"maxInMemorySize"
value=
"4096"
/>
</bean>
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这两种分别是两种上传文件的设置方式，但是不能同时使用。切记。
把这个配置删除测试发现问题解决。
如果你想使用springmvc的文件上传方式，只需要后台接收的方法这么写：
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@RequestMapping
(value =
"imagedetectufile"
, method = { RequestMethod.POST })
@ResponseBody
public
Object detectPictureTask(
@RequestParam
(value =
"image"
, required =
false
) MultipartFile file[],
ModelMap model, HttpServletResponse response)
throws
IOException {
//业务逻辑。。。
//............
}
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亲测好使。