@requestmapping and ModelAndView

Question

Hi help me please with Spring RequestMapping. I have page like this:

<form action="/add_photo" enctype="multipart/form-data" method="POST">
                Photo: <input type="file" name="photo">
                <input type="submit" />
     </form>

and controller like this:

@Controller
@RequestMapping("/")
public class MyController {

    private Map<Long, byte[]> photos = new HashMap<>();


    @RequestMapping("/")
    public String onIndex() {
        return "index";
    }

    @RequestMapping(value = "/add_photo", method = RequestMethod.POST)
    public ModelAndView onAddPhoto(@RequestParam MultipartFile photo) {
        if (photo.isEmpty()) {
            throw new PhotoErrorException();            
        }

        try {
            long id = System.currentTimeMillis();
            photos.put(id, photo.getBytes());

            ModelAndView model = new ModelAndView();
            model.addObject("photo_id", id);
            model.setViewName("result");
            return model;
        } catch (IOException e) {
            throw new PhotoErrorException();
        }
    }
}

method "onIndex" is working but onAddPhoto seems not and when I click button whith URL "/add_photo" it gives me 404 instead page "result"

What is the URL displayed in the address bar when displaying your form? What is the URL displayed in the address bar after you've submitted the form? — JB Nizet, Jan 28 '18 at 17:36
before "http://localhost:8080/photos/" and after "http://localhost:8080/add_photo" — Mr._Rodman, Jan 28 '18 at 17:51
So, if the full path for `@RequestMapping("/")` is `/photos/`, what should be the full url for `@RequestMapping(value = "/add_photo"`? Should it be `/add_photo`, or should it rather be `/photos/add_photo`? What do you think this `/photos`prefix is, and where does it come from? — JB Nizet, Jan 28 '18 at 17:54
/photos prefix is come from deploing .war file on Tomcat server. That's a name of the project. — Mr._Rodman, Jan 28 '18 at 18:07
So you need to add this prefix to every URL pointing to a resource of your application (as Suraj's answer explains). — JB Nizet, Jan 28 '18 at 18:09

score 1 · Accepted Answer · answered Jan 28 '18 at 17:40

1

Use pageContext in your jsp page as:

<form action="${pageContext.request.contextPath}/add_photo" enctype="multipart/form-data" method="POST">
Photo: <input type="file" name="photo">
            <input type="submit" />
 </form>

For more details: Check this

answered Jan 28 '18 at 17:40

Suraj Gautam

1,524
12
21

it's just deleted message [before](https://github.com/mrRodman/hello-world/blob/master/photos/errors/123.PNG) and [after](https://github.com/mrRodman/hello-world/blob/master/photos/errors/1234.PNG) – Mr._Rodman Jan 28 '18 at 18:27

@requestmapping and ModelAndView

1 Answers1