Thymeleaf - th:method="delete/put" leads to: Request method 'POST' not supported-CodePudding

I use Spring Boot v2.7.0, installed from "start.spring.io" and from there I installed Thymeleaf, and as I searched in the parent-pom I found out that: thymeleaf-spring5 (v3.0.15.RELEASE), thymeleaf-extras-java8time (v3.0.4.RELEASE)

Lately, I needed to apply the pattern <form th:method="put/delete".../>. After googling in verious places, I found the solution, which was reffered in the book as well: "Taming Thymeleaf Practical Guide to building a web application with Spring Boot and Thymeleaf - Wim Deblauwe" which is the top/excellent books of Thymeleaf, and from which I learn Thymeleaf. Acoording to these, I did:

Step 1:

Added this property in application.properties:

spring.mvc.hiddenmethod.filter.enabled=true

and I tried it in the application.yaml (as a 2nd solution, because the previous did not work), like this way:

spring:
  mvc:
    hiddenmethod:
      filter:
        enabled: true

Step 2:

I used:

<form th:method="put".../>
<form th:method="delete".../>

Step 3:

Finally I used the: "@PutMapping, @DeleteMapping" in my controller handler methods.

The result was the error message:

There was an unexpected error (type=Method Not Allowed, status=405).
Request method 'POST' not supported
org.springframework.web.HttpRequestMethodNotSupportedException: Request method 'POST' not supported
    at org.springframework.web.servlet.mvc.method.RequestMappingInfoHandlerMapping.handleNoMatch(RequestMappingInfoHandlerMapping.java:253)
    at org.springframework.web.servlet.handler.AbstractHandlerMethodMapping.lookupHandlerMethod(AbstractHandlerMethodMapping.java:442)

After googling I found this solution, to add the needed bean by myself with the following way, which DID WORKED:

@Bean
public FilterRegistrationBean<HiddenHttpMethodFilter> hiddenHttpMethodFilter() {
    FilterRegistrationBean<HiddenHttpMethodFilter> filterRegistrationBean = new FilterRegistrationBean<>(new HiddenHttpMethodFilter());
    filterRegistrationBean.setUrlPatterns(Arrays.asList("/*"));
    return filterRegistrationBean;
}

I wonder why this configuration "spring.mvc.hiddenmethod.filter.enabled=true", does not add the needed bean in my case, and I have to add it by myself.

Anyone can help me on this, please? Thanks a lot in advance

CodePudding user response：

I just did a test myself and this worked fine.

Create a new project on start.spring.io selecting Spring Boot 2.7.1 with dependencies Spring Web and Thymeleaf
Create a controller:

import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.PutMapping;
import org.springframework.web.bind.annotation.RequestMapping;

@RequestMapping
@Controller
public class TestController {
    @GetMapping
    public String index(Model model) {
        model.addAttribute("formData", new TestFormData());
        return "index";
    }

    @PutMapping
    public String doPut(@ModelAttribute("formData") TestFormData formData) {
        System.out.println("formData.getSomeString() = "   formData.getSomeString());
        return "redirect:/";
    }
}

With this form data class:

public class TestFormData {
    private String someString;

    public String getSomeString() {
        return someString;
    }

    public void setSomeString(String someString) {
        this.someString = someString;
    }
}

Create an index.html file in src/main/resources/templates:

<!DOCTYPE html>
<html lang="en"
      xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<form th:action="@{/}" th:method="put" th:object="${formData}">
    <input th:field="*{someString}">
    <button>Save</button>
</form>
</body>
</html>

Update application.properties to contain:

spring.mvc.hiddenmethod.filter.enabled=true

Start the application and go to http://localhost:8080 and enter something in the input field. When pressing save, it is printed to the console, showing that the @PutMapping works.