overriding doPost method in servlet()

问题:

i am relatively new to spring mvc and have been exploring some form submit. However, currently, i have an error of HTTP 405 which would mean that i am unable to post.

The error is that the HTTP post is not supported. I have googled and checked that i would need to override and implement doPost method in my code but i am unsure of how to use the servlet.

By overriding the doPost method, how do I ensure that the new doPost method is applied?

This is my controller class:

package com.**.web.controller;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.security.authentication.AnonymousAuthenticationToken;
import org.springframework.security.core.Authentication;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.stereotype.Controller;
import org.springframework.validation.BindingResult;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.servlet.ModelAndView;

import com.**.dao.*;
import com.**.model.User;

@Controller
public class MainController {

    @Autowired
    private UserDAO UserDAO;

    @RequestMapping(value = {"/hello", "/welcome**" }, method = RequestMethod.GET)
    public ModelAndView defaultPage() {

        ModelAndView model = new ModelAndView();
        model.addObject("title", "Spring Security Login Form - Database Authentication");
        model.addObject("message", "This is default page!");
        model.setViewName("hello");
        return model;

    }

    @RequestMapping(value = "/admin**", method = RequestMethod.GET)
    public ModelAndView adminPage() {

        ModelAndView model = new ModelAndView();
        model.addObject("title", "Spring Security Login Form - Database Authentication");
        model.addObject("message", "This page is for ROLE_ADMIN only!");
        model.setViewName("admin");

        return model;

    }

    @RequestMapping(value = {"/h", "/login"}, method = RequestMethod.GET)
    public ModelAndView login(@RequestParam(value = "error", required = false) String error,
            @RequestParam(value = "logout", required = false) String logout) {

        ModelAndView model = new ModelAndView();
        if (error != null) {
            model.addObject("error", "Invalid username and password!");
        }

        if (logout != null) {
            model.addObject("msg", "You've been logged out successfully.");
        }
        model.setViewName("login");

        return model;

    }

    //for 403 access denied page
    @RequestMapping(value = "/402", method = RequestMethod.GET)
    public ModelAndView accesssDenied() {

        ModelAndView model = new ModelAndView();

        //check if user is login
        Authentication auth = SecurityContextHolder.getContext().getAuthentication();
        if (!(auth instanceof AnonymousAuthenticationToken)) {
            UserDetails userDetail = (UserDetails) auth.getPrincipal();
            System.out.println(userDetail);

            model.addObject("username", userDetail.getUsername());

        }

        model.setViewName("402");
        return model;

    }

    @RequestMapping(value = "/Account/userManagement", method = RequestMethod.GET)
    public ModelAndView accountPage() {
        ModelAndView model = new ModelAndView();
        model.setViewName("Account/userManagement");
        return model;
    }

    @RequestMapping(value = "Notification/notification", method = RequestMethod.GET)
    public ModelAndView NotificationPage() {
        ModelAndView model = new ModelAndView();
        model.setViewName("Notification/notification");
        return model;
    }

    @RequestMapping(value = "test", method = RequestMethod.POST)
    public ModelAndView register(@ModelAttribute("user-entity") User user, BindingResult result)
    {
        ModelAndView model = new ModelAndView();
        UserDAO.create(user);
        model.setViewName("hello");
        return model;
    }

    @RequestMapping(value = {"/","/Account/registration"}, method = RequestMethod.GET)
    public ModelAndView registerPage()
    {
        ModelAndView model = new ModelAndView("/Account/registration", "user-entity", new User());
        return model;
    }

}

this is my form code

<form:form action="test" method="POST" modelAttribute = "user-entity">
   <td> <td><form:label path="Username">Name:</form:label></td>  
            <td>
            <form:input path="Username"></form:input>
            </td>
          </tr>
          <tr>
            <td>Password:&nbsp;</td>
            <td><form:input type = "password" path = "Password" ></form:input></td>
          </tr>
</form:form>

Exception

Aug 03, 2014 6:12:53 PM org.springframework.web.servlet.PageNotFound handleHttpRequestMethodNotSupported WARNING: Request method 'POST' not supported

This is a link to my previous question

POST not working in spring mvc 4

I modified my form action to

 <form:form action="/<packagename>/Account/test" method="POST" modelAttribute = "user-entity">

the default url of the registration page is

http://localhost:8080/<package name>/

and i updated my corresponding controller code to

@RequestMapping(value = "/<package name>/Account/test", method = RequestMethod.POST)
    public ModelAndView register(@ModelAttribute("user-entity") User user, BindingResult result)
    {
        ModelAndView model = new ModelAndView();
        UserDAO.create(user);
        model.setViewName("/Account/test");
        return model;
    }

The url i am trying to get to is /Account/test

回答1:

The problem is that your URL doesn't support a POST method. By looking at all your GET requests, they all start with a relative path and then the real URL, for example:

/Notification/notification
/Account/userManagement
/h <-- this seems ridiculous...
/admin
/hello

And in your form you post to "test":

<form:form action="test" method="POST" modelAttribute = "user-entity">
    <!-- rest of your html code ... -->
</form:form>

Which means that any post will go to /<whatever_goes_here>/test i.e. (since you don't specify which one is your current view):

/Notification/test
/Account/test
/test <-- this may work as expected
/test <-- this may work as expected
/test <-- this may work as expected

And you don't have any of the first two mappings.

Solution: fix your URLs or go to the real URL by using HttpServletRequest#getContextPath. Note: avoid usage of scriptlets, instead use the Expression Language in your JSP: ${request.contextPath}.

<form:form action="${request.contextPath}/test" method="POST" modelAttribute = "user-entity">