How to fix “org.springframework.web.HttpRequestMet

问题:

So I'm getting an warning as

 WARN  [org.springframework.web.servlet.mvc.support.DefaultHandlerExceptionResolver] (default task-2) Resolved [org.springframework.web.HttpRequestMethodNotSupportedException: Request method 'POST' not supported] 

when I go to the following URL http://localhost:8080/ProjectFE/uregistration and the website shows

HTTP 405 Method not allowed

here is my controller code:

package controller;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;

import model.daoimpl.UserinfoDaoImpl;
import model.dao.IUserinfoDAO;
import model.entity.Userinfo;

@Controller
public class RegistrationController {
    @RequestMapping(value="/registration",method = RequestMethod.GET)
    public String addRegistrationPage() {
        return "registrationpage";
    }
    @RequestMapping(value="/uregistration",method = RequestMethod.POST)
    public String addURegistrationPage(@ModelAttribute("User")Userinfo u) {
        IUserinfoDAO iu = new UserinfoDaoImpl();
        boolean b = iu.insertInfo(u);
        if(b)
            return "success";
        else
            return "registrationpage";
    }

}

So what should I do ? Also if any other code is required please comment I'll edit the post, Thankyou.

回答1:

The issue is with the annotation @Controller inside your code. change it to @RestController and it should start working. Here is the Sample code which I have created and it works well :

package com.sample;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.*;

@RestController
public class Sample {
@RequestMapping(value="/registration",method = RequestMethod.GET)
public String addRegistrationPage() {
    return "registrationpage";
}
@RequestMapping(value="/uregistration",method = RequestMethod.POST)
public String addURegistrationPage(@RequestBody String u) {

    boolean b = true;
    if (b)
        return "success";
    else
        return "registra";
}

}

回答2:

As your GET handler mapping is /registration, change your POST handler mapping to same value:

@RequestMapping(value = "/registration", method = RequestMethod.POST)

回答3:

I solved mine by simply adding csrf configurations as mentioned in spring documentation when making an ajax request to the server. Remember that csrf is enabled by default in spring and you have to either disable it (bad) or enable it. Link is here

https://docs.spring.io/spring-security/site/docs/5.0.x/reference/html/csrf.html

So I added <meta name="_csrf" th:content="${_csrf.token}" /> <meta name="_csrf_header" th:content="${_csrf.headerName}" />

<script type="application/x-javascript">
   (function () {
       var token = $("meta[name='_csrf']").attr("content");
       var header = $("meta[name='_csrf_header']").attr("content");
       $(document).ajaxSend(function(e, xhr, options) {
          xhr.setRequestHeader(header, token);
       });
   });
</script>

to my html head and inside the form I am submitting, I included this little hidden input and mine worked for me. Hope it helps ya.

<input type="hidden" th:name="${_csrf.parameterName}"
                        th:value="${_csrf.token}" />