spring 应用程序中的 POST 请求不支持 415 MediaType

Question

我有一个非常简单的 Spring 应用程序（不是 spring 启动）。我已经实现了 GET 和 POST 控制器方法。 GET 方法工作正常。但是 POST 正在抛出 415 Unsupported MediaType。重现步骤如下

ServiceController. java

package com.example.myApp.controller;

import org.springframework.stereotype.Controller;
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.ResponseBody;


    @Controller
    @RequestMapping("/service/example")
    public class ServiceController {

        @RequestMapping(value="sample", method = RequestMethod.GET)
        @ResponseBody
    public String getResp() {
        return "DONE";
    }

    @RequestMapping(value="sample2", method = RequestMethod.POST, consumes = "application/json")
    @ResponseBody
    public String getResponse2(@RequestBody Person person) {
        return "id is " + person.getId();
    }

}

class Person {

    private int id;
    private String name;

    public Person(){

    }

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }
}

AppConfig.java

package com.example.myApp.app.config;

import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;
import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;

@Configuration
@EnableWebMvc
@ComponentScan("com.example.myApp")
public class AppConfig extends WebMvcConfigurerAdapter {

    @Override
    public void addResourceHandlers(ResourceHandlerRegistry registry) {
        registry.addResourceHandler("/test/**").addResourceLocations("/test/").setCachePeriod(0);
        registry.addResourceHandler("/css/**").addResourceLocations("/css/").setCachePeriod(0);
        registry.addResourceHandler("/img/**").addResourceLocations("/img/").setCachePeriod(0);
        registry.addResourceHandler("/js/**").addResourceLocations("/js/").setCachePeriod(0);
    }
}

AppInitializer.java

package com.example.myApp.app.config;

import org.springframework.web.WebApplicationInitializer;
import org.springframework.web.context.ContextLoaderListener;
import org.springframework.web.context.support.AnnotationConfigWebApplicationContext;
import org.springframework.web.servlet.DispatcherServlet;

import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.ServletRegistration;

public class AppInitializer implements WebApplicationInitializer {

    @Override
    public void onStartup(ServletContext servletContext) throws ServletException {


        // Create the 'root' Spring application context
        AnnotationConfigWebApplicationContext rootContext =
                new AnnotationConfigWebApplicationContext();

        rootContext.register(AppConfig.class);
        servletContext.addListener(new ContextLoaderListener(rootContext));

        // Register and map the dispatcher servlet
        ServletRegistration.Dynamic dispatcher =
                servletContext.addServlet("dispatcher", new DispatcherServlet(rootContext));

        dispatcher.setLoadOnStartup(1);
        dispatcher.addMapping("/");

    }


}

代码可在此处获得：

git clone https://bitbucket.org/SpringDevSeattle/springrestcontroller.git
./gradlew clean build tomatrunwar

这会旋转嵌入 tomcat。

现在你可以curl以下

curl -X GET -H "Content-Type: application/json" "http://localhost:8095/myApp/service/example/sample"

工作正常

但是

curl -X POST -H "Content-Type: application/json" '{
    "id":1,
    "name":"sai"
}' "http://localhost:8095/myApp/service/example/sample2"

抛出 415 不受支持的 MediaType

<body>
        <h1>HTTP Status 415 - </h1>
        <HR size="1" noshade="noshade">
        <p>
            <b>type</b> Status report
        </p>
        <p>
            <b>message</b>
            <u></u>
        </p>
        <p>
            <b>description</b>
            <u>The server refused this request because the request entity is in a format not supported by the requested resource for the requested method.</u>
        </p>
        <HR size="1" noshade="noshade">
        <h3>Apache Tomcat/7.0.54</h3>
    </body>

Answer 1

接受 Header 可能是问题所在。据我所知，当您通过 curl 发送请求时，它会添加一个默认值 header accept : */*
但是在 JSON 的情况下，你必须提到接受 header
作为 accept : application/json
同样你提到了 content-Type.

还有一点，我不知道那是什么，但你不认为你必须像那样放置 "request mappings"

@RequestMapping(value="/sample" ...
@RequestMapping(value="/sample2" ...

情况可能并非如此，但接受 header 才是关键，我认为这是主要问题。
解决方案 2
既然你有这个代码

public String getResponse2(@RequestBody Person person)

我以前遇到过这个问题，解决方法二可能对这里有帮助

当内容类型为 application/x-www-form-urlencoded 时用于 @RequestBody-annotated 参数的 FormHttpMessageConverter 无法像 @ModelAttribute 那样绑定目标类。因此你需要 @ModelAttribute 而不是 @RequestBody

像这样使用@ModelAttribute 注解而不是@RequestBody

public String getResponse2(@ModelAttribute Person person)

我向某人提供了相同的答案并且它有所帮助。这是我的 answer

Answer 2

你能尝试在 curl 中使用 -d 选项吗

curl -H "Content-Type: application/json" -X POST -d
 '{"id":"1,"name":"sai"}'
 http://localhost:8095/myApp/service/example/sample2

另外，如果你使用 windows 你应该转义双引号

-d "{ \"id\": 1, \"name\":\"sai\" }"

Answer 3

我找到了解决方案，我想 post 在这里，以便其他人受益。

首先我需要在我的类路径中包含 jackson，我在 build.gradle 中添加如下：

 compile 'com.fasterxml.jackson.core:jackson-databind:2.7.5'
    compile 'com.fasterxml.jackson.core:jackson-annotations:2.7.5'
    compile 'com.fasterxml.jackson.core:jackson-core:2.7.5'

接下来，我必须更改扩展 WebMvcConfigurerAdapter 的 AppConfig，如下所示：

@Configuration
@EnableWebMvc
@ComponentScan("com.example.myApp")
public class AppConfig extends WebMvcConfigurerAdapter {

    @Override
    public void addResourceHandlers(ResourceHandlerRegistry registry) {
        registry.addResourceHandler("/test/**").addResourceLocations("/test/").setCachePeriod(0);
        registry.addResourceHandler("/css/**").addResourceLocations("/css/").setCachePeriod(0);
        registry.addResourceHandler("/img/**").addResourceLocations("/img/").setCachePeriod(0);
        registry.addResourceHandler("/js/**").addResourceLocations("/js/").setCachePeriod(0);
    }


    @Override
    public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {

        converters.add(new MappingJackson2HttpMessageConverter());
        super.configureMessageConverters(converters);
    }
}

就是这样，一切都很好

spring 应用程序中的 POST 请求不支持 415 MediaType

415 Unsupported MediaType for POST request in spring application

spring

spring-mvc

spring-restcontroller