不支持 Spring Boot 405 POST 方法？

Question

Spring Boot MVC 怎么会不支持 POST 方法？！我正在尝试实现一个接受实体列表的简单 post 方法：这是我的代码

@RestController(value="/backoffice/tags")
public class TagsController {

    @RequestMapping(value = "/add", method = RequestMethod.POST)
        public void add(@RequestBody List<Tag> keywords) {
            tagsService.add(keywords);
        }
}

像这样点击这个网址：

http://localhost:8090/backoffice/tags/add

请求正文：

[{"tagName":"qweqwe"},{"tagName":"zxczxczx"}]

我收到：

{
    "timestamp": 1441800482010,
    "status": 405,
    "error": "Method Not Allowed",
    "exception": "org.springframework.web.HttpRequestMethodNotSupportedException",
    "message": "Request method 'POST' not supported",
    "path": "/backoffice/tags/add"
} 

编辑：

调试 Spring Web 请求处理程序

     public void handleRequest(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
            this.checkRequest(request); 

 protected final void checkRequest(HttpServletRequest request) throws ServletException {
        String method = request.getMethod();
        if(this.supportedMethods != null && !this.supportedMethods.contains(method)) {
            throw new HttpRequestMethodNotSupportedException(method, StringUtils.toStringArray(this.supportedMethods));
        } else if(this.requireSession && request.getSession(false) == null) {
            throw new HttpSessionRequiredException("Pre-existing session required but none found");
        }
    }

supportedMethods 中仅有的两个方法是{GET,HEAD}

Answer 1

您在 RestController 注释定义中有错误。根据文档，它是：

公共@interface RestController {

/** * 该值可能表示对逻辑组件的建议 name, * 在自动检测到的情况下转换为 Spring bean 零件。 * @return 建议的组件名称，如果有的话 * @since 4.0.1 */ String value() default "";

}

这意味着您输入的值（“/backoffice/tags”）是控制器的名称，而不是它可用的路径。

在控制器的类上添加@RequestMapping("/backoffice/tags") 并从@RestController 注释中删除值。

编辑： 根据评论，它不起作用的完全工作示例 - 请尝试使用此代码 - 并从 IDE 在本地运行。

build.gradle

buildscript {
    ext {
        springBootVersion = '1.2.5.RELEASE'
    }
    repositories {
        mavenCentral()
    }
    dependencies {
        classpath("org.springframework.boot:spring-boot-gradle-plugin:${springBootVersion}") 
        classpath("io.spring.gradle:dependency-management-plugin:0.5.2.RELEASE")
    }
}

apply plugin: 'java'
apply plugin: 'eclipse'
apply plugin: 'idea'
apply plugin: 'spring-boot' 
apply plugin: 'io.spring.dependency-management' 

jar {
    baseName = 'demo'
    version = '0.0.1-SNAPSHOT'
}
sourceCompatibility = 1.8
targetCompatibility = 1.8

repositories {
    mavenCentral()
}


dependencies {
    compile("org.springframework.boot:spring-boot-starter-web")
    testCompile("org.springframework.boot:spring-boot-starter-test") 
}


eclipse {
    classpath {
         containers.remove('org.eclipse.jdt.launching.JRE_CONTAINER')
         containers 'org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-1.8'
    }
}

task wrapper(type: Wrapper) {
    gradleVersion = '2.3'
}

Tag.java

package demo;

import com.fasterxml.jackson.annotation.JsonCreator;
import com.fasterxml.jackson.annotation.JsonProperty;

public class Tag {

    private final String tagName;

    @JsonCreator
    public Tag(@JsonProperty("tagName") String tagName) {
        this.tagName = tagName;
    }

    public String getTagName() {
        return tagName;
    }

    @Override
    public String toString() {
        final StringBuilder sb = new StringBuilder("Tag{");
        sb.append("tagName='").append(tagName).append('\'');
        sb.append('}');
        return sb.toString();
    }
}

SampleController.java

package demo;

import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;

import java.util.List;

@RestController
@RequestMapping("/backoffice/tags")
public class SampleController {

    @RequestMapping(value = "/add", method = RequestMethod.POST)
    public void add(@RequestBody List<Tag> tags) {
        System.out.println(tags);
    }
}

DemoApplication.java

package demo;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class DemoApplication {

    public static void main(String[] args) {
        SpringApplication.run(DemoApplication.class, args);
    }
}

Answer 2

实际上当方法名称可用但方法类型与所需类型不同时，此异常将抛出 405。

Answer 3

我在开发时遇到了同样的错误。请检查 URL 路径是否与您正在检查的路径正确映射。希望它能解决问题。