@requestmapping和ModelAndView

Question

嗨帮我请Spring SpringMapping。我有这样的页面：

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

和这样的控制器：

@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();
        }
    }
}

方法＆＃34; onIndex＆＃34;正在工作，但onAddPhoto似乎没有，当我点击按钮whith URL＆＃34; / add_photo＆＃34;它给了我404而不是页面＆＃34;结果＆＃34;

Answer 1

在jsp页面中使用pageContext：

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

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