6

我正在尝试使用 Java 制作一个 RESTful 服务，使用几个教程和许多很多 StackOverflow 条目。不幸的是，我似乎无法让我的代码正常工作，当我尝试访问端点时，我一直在获取 Http 406。任何帮助表示赞赏。

GreetingController.java：

import java.util.Random;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;

@Controller
@RequestMapping("/greeting")
public class GreetingController {

    protected final Logger log = LoggerFactory.getLogger(GreetingController.class);

    private static final String template = "Hello, %s!";
    private static Random rand = new Random();

    @RequestMapping(method = RequestMethod.GET, headers="Accept=*/*")//, value="/{name}")
    @ResponseBody
    public Greeting greeting() {
        log.debug("Entered greeting()");
        return new Greeting(rand.nextInt(99999999),
                            String.format(template, "Stephen"));
    }

    @RequestMapping(method = RequestMethod.GET, value="/{name}")
    @ResponseBody
    public Greeting greetingName(@PathVariable String name) {
        log.debug("Entered greetingName()");
        return new Greeting(rand.nextInt(99999999),
                            String.format(template, name));
    }
}

问候.java：

import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;

@XmlRootElement(name="greeting")
@XmlAccessorType(XmlAccessType.PUBLIC_MEMBER)
public class Greeting {

    private Integer id;
    private String content;

    public Greeting() {

    }

    public Greeting(Integer id, String content) {
        this.id = id;
        this.content = content;
    }

    @XmlElement
    public void setId(Integer id) {
        this.id = id;
    }

    public Integer getId() {
        return id;
    }

    @XmlElement
    public void setContent(String content) {
        this.content = content;
    }

    public String getContent() {
        return content;
    }
}

x-servlet.xml：

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:security="http://www.springframework.org/schema/security"
    xmlns:context="http://www.springframework.org/schema/context"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:oxm="http://www.springframework.org/schema/oxm"
    xmlns:mvc="http://www.springframework.org/schema/tx"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd
        http://www.springframework.org/schema/oxm http://www.springframework.org/schema/oxm/spring-oxm-3.0.xsd
        http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
        http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd">

    <context:component-scan base-package="com.package.name" />

    <mvc:annotation-driven/>

    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
      <property name="prefix">
            <value>/WEB-INF/pages/</value>
      </property>
      <property name="suffix">
            <value>.jsp</value>
      </property>
    </bean>

</beans>

Http 标头（通过萤火虫）：

Response Headers
Content-Language    en
Content-Length  1067
Content-Type    text/html;charset=utf-8
Date    Tue, 18 Feb 2014 20:24:13 GMT
Server  Apache-Coyote/1.1

Request Headers
Accept  text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Encoding gzip, deflate
Accept-Language en-US,en;q=0.5
Connection  keep-alive
Cookie  JSESSIONID=9064B3E9F1C3259B73C65B022C8BDC75
Host    localhost:8080
User-Agent  Mozilla/5.0 (Windows NT 6.0; WOW64; rv:26.0) Gecko/20100101 Firefox/26.0

在启动 tomcat 并点击所述服务器上的不同页面时记录：

DEBUG o.s.security.web.FilterChainProxy - Converted URL to lowercase, from: '/greeting'; to: '/greeting'
DEBUG o.s.security.web.FilterChainProxy - Candidate is: '/greeting'; pattern is /**; matched=true
DEBUG o.s.security.web.FilterChainProxy - /greeting at position 1 of 12 in additional filter chain; firing Filter: 'org.springframework.security.web.access.channel.ChannelProcessingFilter@9a6bbb'
DEBUG o.s.s.w.a.i.DefaultFilterInvocationSecurityMetadataSource - Converted URL to lowercase, from: '/greeting'; to: '/greeting'
DEBUG o.s.s.w.a.i.DefaultFilterInvocationSecurityMetadataSource - Candidate is: '/greeting'; pattern is /**; matched=true
DEBUG o.s.s.w.a.c.ChannelProcessingFilter - Request: FilterInvocation: URL: /greeting; ConfigAttributes: [ANY_CHANNEL]
DEBUG o.s.security.web.FilterChainProxy - /greeting at position 2 of 12 in additional filter chain; firing Filter: 'org.springframework.security.web.context.SecurityContextPersistenceFilter@16fcc4'
DEBUG o.s.s.w.c.HttpSessionSecurityContextRepository - No HttpSession currently exists
DEBUG o.s.s.w.c.HttpSessionSecurityContextRepository - No SecurityContext was available from the HttpSession: null. A new one will be created.
DEBUG o.s.security.web.FilterChainProxy - /greeting at position 3 of 12 in additional filter chain; firing Filter: 'org.springframework.security.web.authentication.logout.LogoutFilter@1db52c8'
DEBUG o.s.security.web.FilterChainProxy - /greeting at position 4 of 12 in additional filter chain; firing Filter: 'org.springframework.security.web.authentication.UsernamePasswordAuthenticationFilter@17d6c1'
DEBUG o.s.security.web.FilterChainProxy - /greeting at position 5 of 12 in additional filter chain; firing Filter: 'org.springframework.security.web.authentication.ui.DefaultLoginPageGeneratingFilter@1144823'
DEBUG o.s.security.web.FilterChainProxy - /greeting at position 6 of 12 in additional filter chain; firing Filter: 'org.springframework.security.web.authentication.www.BasicAuthenticationFilter@8c02cc'
DEBUG o.s.security.web.FilterChainProxy - /greeting at position 7 of 12 in additional filter chain; firing Filter: 'org.springframework.security.web.savedrequest.RequestCacheAwareFilter@bbd1b'
DEBUG o.s.security.web.FilterChainProxy - /greeting at position 8 of 12 in additional filter chain; firing Filter: 'org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter@ac576f'
DEBUG o.s.security.web.FilterChainProxy - /greeting at position 9 of 12 in additional filter chain; firing Filter: 'org.springframework.security.web.authentication.AnonymousAuthenticationFilter@15daa9e'
DEBUG o.s.s.w.a.AnonymousAuthenticationFilter - Populated SecurityContextHolder with anonymous token: 'org.springframework.security.authentication.AnonymousAuthenticationToken@9055c2bc: Principal: anonymousUser; Credentials: [PROTECTED]; Authenticated: true; Details: org.springframework.security.web.authentication.WebAuthenticationDetails@b364: RemoteIpAddress: 0:0:0:0:0:0:0:1; SessionId: null; Granted Authorities: ROLE_ANONYMOUS'
DEBUG o.s.security.web.FilterChainProxy - /greeting at position 10 of 12 in additional filter chain; firing Filter: 'org.springframework.security.web.session.SessionManagementFilter@6c9f0f'
DEBUG o.s.security.web.FilterChainProxy - /greeting at position 11 of 12 in additional filter chain; firing Filter: 'org.springframework.security.web.access.ExceptionTranslationFilter@13ec758'
DEBUG o.s.security.web.FilterChainProxy - /greeting at position 12 of 12 in additional filter chain; firing Filter: 'org.springframework.security.web.access.intercept.FilterSecurityInterceptor@917cb0'
DEBUG o.s.s.w.a.i.DefaultFilterInvocationSecurityMetadataSource - Converted URL to lowercase, from: '/greeting'; to: '/greeting'
DEBUG o.s.s.w.a.i.DefaultFilterInvocationSecurityMetadataSource - Candidate is: '/greeting'; pattern is /welcome*; matched=false
DEBUG o.s.s.w.a.i.DefaultFilterInvocationSecurityMetadataSource - Candidate is: '/greeting'; pattern is /**; matched=true
DEBUG o.s.s.w.a.i.FilterSecurityInterceptor - Secure object: FilterInvocation: URL: /greeting; Attributes: [IS_AUTHENTICATED_ANONYMOUSLY]
DEBUG o.s.s.w.a.i.FilterSecurityInterceptor - Previously Authenticated: org.springframework.security.authentication.AnonymousAuthenticationToken@9055c2bc: Principal: anonymousUser; Credentials: [PROTECTED]; Authenticated: true; Details: org.springframework.security.web.authentication.WebAuthenticationDetails@b364: RemoteIpAddress: 0:0:0:0:0:0:0:1; SessionId: null; Granted Authorities: ROLE_ANONYMOUS
DEBUG o.s.s.access.vote.AffirmativeBased - Voter: org.springframework.security.access.vote.RoleVoter@1913751, returned: 0
DEBUG o.s.s.access.vote.AffirmativeBased - Voter: org.springframework.security.access.vote.AuthenticatedVoter@c6b80e, returned: 1
DEBUG o.s.s.w.a.i.FilterSecurityInterceptor - Authorization successful
DEBUG o.s.s.w.a.i.FilterSecurityInterceptor - RunAsManager did not change Authentication object
DEBUG o.s.security.web.FilterChainProxy - /greeting reached end of additional filter chain; proceeding with original chain
DEBUG o.s.web.servlet.DispatcherServlet - DispatcherServlet with name 'spring-tutorial' determining Last-Modified value for [/SpringMVC/greeting]
DEBUG o.s.w.s.m.a.DefaultAnnotationHandlerMapping - Mapping [/greeting] to handler 'com.example.controller.GreetingController@1eb1db2'
DEBUG o.s.web.servlet.DispatcherServlet - Last-Modified value for [/SpringMVC/greeting] is: -1
DEBUG o.s.web.servlet.DispatcherServlet - DispatcherServlet with name 'spring-tutorial' processing GET request for [/SpringMVC/greeting]
DEBUG o.s.w.b.a.s.HandlerMethodInvoker - Invoking request handler method: public com.example.form.Greeting com.example.controller.GreetingController.greeting()
INFO  c.s.controller.GreetingController - Entered greeting()
DEBUG o.s.w.s.m.a.AnnotationMethodHandlerExceptionResolver - Resolving exception from handler [com.example.controller.GreetingController@1eb1db2]: org.springframework.web.HttpMediaTypeNotAcceptableException: Could not find acceptable representation
DEBUG o.s.w.s.m.a.ResponseStatusExceptionResolver - Resolving exception from handler [com.example.controller.GreetingController@1eb1db2]: org.springframework.web.HttpMediaTypeNotAcceptableException: Could not find acceptable representation
DEBUG o.s.w.s.m.s.DefaultHandlerExceptionResolver - Resolving exception from handler [com.example.controller.GreetingController@1eb1db2]: org.springframework.web.HttpMediaTypeNotAcceptableException: Could not find acceptable representation
DEBUG o.s.s.w.c.HttpSessionSecurityContextRepository - SecurityContext contents are anonymous - context will not be stored in HttpSession. 
DEBUG o.s.web.servlet.DispatcherServlet - Null ModelAndView returned to DispatcherServlet with name 'spring-tutorial': assuming HandlerAdapter completed request handling
DEBUG o.s.web.servlet.DispatcherServlet - Successfully completed request
DEBUG o.s.s.w.a.ExceptionTranslationFilter - Chain processed normally
DEBUG o.s.s.w.c.SecurityContextPersistenceFilter - SecurityContextHolder now cleared, as request processing completed
4

4 回答 4

9

我只是在尝试解决同一问题时遇到了这个问题。在查看 pfac 的答案后，我发现只需将 jackson-dataformat-xml 库添加到我的项目中即可解决我的问题。

如果使用 Maven：

<dependency>
    <groupId>com.fasterxml.jackson.dataformat</groupId>
    <artifactId>jackson-dataformat-xml</artifactId>
    <version>2.3.2</version>
</dependency>
于 2015-03-19T19:56:25.883 回答
3

只是花了几个小时来追逐这个，所以我要离开这里对我有用的东西（我正在使用Spring 4.0.6）以及我相信对你有用的东西（Spring 3.0.x）。

春天 4.0.x

由于MappingJackson2HttpMessageConverter自动选择 Jackson 数据绑定库并启用带有注释的控制器方法@ResponseBody以自动返回 JSON，因此通常假设 XML 也存在这样的工具，但事实并非如此。

为了启用 XML，我必须手动创建RequestMappingHandlerAdapter带有两个消息转换器的 a，aMarshallingHttpMessageConverter后跟一个MappingJackson2HttpMessageConverter.

这也允许使用 Spring 提供的任何编组器，只需将其设置为MarshallingHttpMessageConverter.

结果spring-servlet.xml：

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">

    <!-- ... -->

    <bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter">
        <property name="messageConverters">
            <list>
                <bean class="org.springframework.http.converter.xml.MarshallingHttpMessageConverter">
                    <property name="marshaller">
                        <bean class="org.springframework.oxm.xstream.XStreamMarshaller"></bean>
                    </property>
                </bean>
                <bean class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter"></bean>
            </list>
        </property>
    </bean>

    <!-- ... -->

</beans>

春天 3.0.x

注意：我假设此版本来自您的x-servlet.xml.

根据http://spring.io/blog/2013/05/11/content-negotiation-using-spring-mvc和http://spring.io/blog/2013/06/03/content-negotiation-using- views/，有两种方法可以在 Spring 3 中实现您想要的。第一种是使用 a ContentNegotiationManager，它仅在 3.2.x 版本之后可用，因此不适用于您的版本。第二个是使用 a ContentNegotiatingViewResolver，它根据请求的内容类型将视图的解析委托给其他解析器（无论是由Accept标题定义，通过扩展定义，还是默认情况下是可配置的）。

基本上，您需要为 a 配置ContentNegotiatingViewResolver两个解析器，一个用于 XML，另一个用于 JSP 视图。

spring-servlet.xml：

<bean class="org.springframework.web.servlet.view.ContentNegotiatingViewResolver">
    <property name="viewResolvers">
        <list>
            <bean class="org.springframework.web.servlet.view.XmlViewResolver">
                <property name="location" value="spreadsheet-views.xml"/>
            </bean>

            <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
                <property name="prefix" value="WEB-INF/views"/>
                <property name="suffix" value=".jsp"/>
            </bean>
        </list>
    </property>
</bean>

例如，您可以为 JSON 添加视图解析器，但您必须实现它，因为 Spring 不提供。第二篇博客文章展示了如何实现一个简单的。

于 2014-08-19T16:26:41.710 回答
1

406 表示请求内容被服务器视为不可接受。尝试删除Accept标题或添加headers="Accept=*/*"到@RequestMapping注释中。

于 2014-02-18T21:07:06.873 回答
0

我正在努力解决类似的问题。似乎由于某种原因，我的 Web 应用程序默认不提供 xml 数据类型，即使我在注释中设置了“ produce=application/xml ”参数。

我只是通过为我的 applicationContext.xml 添加额外的 bean 配置来解决它：

<bean id="contentNegotiationManager" class="org.springframework.web.accept.ContentNegotiationManagerFactoryBean">
   <property name="defaultContentType" value="application/xml" />
</bean>
<mvc:annotation-driven content-negotiation-manager="contentNegotiationManager" />

或通过 Java Config 类：

@Configuration
@EnableWebMvc
public class WebConfig extends WebMvcConfigurerAdapter {
    @Override
    public void configureContentNegotiation(ContentNegotiationConfigurer configurer) {
        configurer.defaultContentType(MediaType.APPLICATION_XML);
    }
}
于 2018-05-29T11:43:05.323 回答