I'm facing an issue when I deploy my application on server side (on local machine everything works fine). In my application, a user can use multiupload for uploading files. Here is my controller:
@Controller
public class FileUploadController {
@Autowired
private StoryService storyService;
@Autowired
private PhotoService photoService;
@RequestMapping("/uploader")
public String home() {
// will be resolved to /views/fileUploader.jsp
return "admin/fileUploader";
}
@RequestMapping(value = "/admin/story/upload", method = RequestMethod.POST)
public @ResponseBody
String upload(MultipartHttpServletRequest request,
HttpServletResponse response, HttpServletRequest req) throws IOException {
//get story id
Integer story_id = Integer.valueOf(req.getParameter("story_id"));
Story story = storyService.findById(story_id);
// Getting uploaded files from the request object
Map<String, MultipartFile> fileMap = request.getFileMap();
// Iterate through the map
for (MultipartFile multipartFile : fileMap.values()) {
// Save the file to local disk
String name = Long.toString(System.currentTimeMillis());
//original size
saveFileToLocalDisk(multipartFile, name + ".jpg");
//medium size
Thumbnails.of(convertMultifileToFile(multipartFile)).size(1800, 2400)
.toFile(new File(getDestinationLocation() + "medium_" + name));
//thumbnail size
Thumbnails.of(convertMultifileToFile(multipartFile)).size(600, 800)
.toFile(new File(getDestinationLocation() + "thumb_" + name));
//Save to db
savePhoto(multipartFile, name, story);
}
return "redirect:/admin";
}
private void saveFileToLocalDisk(MultipartFile multipartFile, String name)
throws IOException, FileNotFoundException {
FileCopyUtils.copy(multipartFile.getBytes(), new FileOutputStream(getDestinationLocation() +
name));
}
private String getOutputFilename(MultipartFile multipartFile) {
return getDestinationLocation() + multipartFile.getOriginalFilename();
}
private Photo savePhoto(MultipartFile multipartFile, String name, Story story)
throws IOException {
Photo photo = new Photo();
if (story != null) {
photo.setName(name);
photo.setStory(story);
photoService.addPhoto(photo);
}
return photo;
}
private String getDestinationLocation() {
return "/var/www/static/images/";
}
public File convertMultifileToFile(MultipartFile file) throws IOException
{
File convFile = new File(file.getOriginalFilename());
convFile.createNewFile();
FileOutputStream fos = new FileOutputStream(convFile);
fos.write(file.getBytes());
fos.close();
return convFile;
}
}
When I try to upload images on the server, I'm getting following exception:
SEVERE: Servlet.service() for servlet [mvc-dispatcher] in context with path [] threw exception [Request processing failed; nested exception is java.lang.NumberFormatException: For input string: ""] with root cause
java.lang.NumberFormatException: For input string: ""
Can't figure out what it means and how to solve it. By the way, I've noticed that when I upload files which are 100-200 KB everything is ok, when files are 4-5 MB I get exception.
Thanks in advance!
It appears that "story_id"
is not always set; correlation with the file size may or may not be a coincidence.
You should protect your code from client-side errors like this by treating the "story_id"
parameter as optional. This is a good idea for all request parameters, because it prevents your server side from crashing on improperly formed requests:
String storyIdStr = req.getParameter("story_id");
if (storyIdStr == null || storyIdStr.length() == 0) {
// Deal with the error
}
Integer story_id = null;
try {
story_id = Integer.valueOf(storyIdStr);
} catch (NumberFormatException nfe) {
// Deal with the error
}
Integer.valueOf(req.getParameter("story_id"));
will give you this exception if req.getParameter("story_id")
returns an empty String, since an empty String can't be parsed as an Integer
.
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