Spring 3 REST with XML 给出了“406 Not Acceptable”

Question

我正在尝试使用 Spring 3 实现 REST Remoting，但无法解决“406 Not Acceptable”错误... 我尝试远程 1 返回 application/xml 内容的服务。每次我发送带有“Accept=application/xml”的请求时，都会收到 406 错误。每次我用一些不同的“Accept”标头发送它时，我都会收到 404 （和 handleNoSuchRequestHandlingMethod 异常）。正如我在日志中看到的那样，服务本身被调用。我还发现，在 servlet 初始化期间，我收到以下错误，尽管我不确定这是否是一个问题：

Did not find any ViewResolvers to delegate to; please configure them using the 'viewResolvers' property on the ContentNegotiatingViewResolver

我尝试了许多不同的配置，但没有成功。也许您可以发现我的实现中存在一些错误？

extService-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:util="http://www.springframework.org/schema/util"
    xmlns:aop="http://www.springframework.org/schema/aop" xmlns:context="http://www.springframework.org/schema/context"
    xmlns:task="http://www.springframework.org/schema/task" xmlns:mvc="http://www.springframework.org/schema/mvc"
    xmlns:oxm="http://www.springframework.org/schema/oxm" xmlns:p="http://www.springframework.org/schema/p"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
                        http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-3.0.xsd
                        http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-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/task http://www.springframework.org/schema/task/spring-task-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/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd">

    <context:component-scan base-package="ch.epimmo.immogreen.backend.mvc" />

    <mvc:annotation-driven />

    <oxm:jaxb2-marshaller id="jaxbMarshaller">
        <oxm:class-to-be-bound name="ch.epimmo.immogreen.common.dto.ExpertDto" />
    </oxm:jaxb2-marshaller>


    <bean
        class="org.springframework.web.servlet.view.ContentNegotiatingViewResolver"
        p:order="#{T(org.springframework.core.Ordered).HIGHEST_PRECEDENCE}">
        <property name="defaultContentType" value="text/html" />
        <!-- <property name="ignoreAcceptHeader" value="true" /> -->
        <property name="favorPathExtension" value="true" />
        <property name="mediaTypes">
            <map>
                <entry key="xml" value="application/xml" />
            </map>
        </property>
        <property name="defaultViews">
            <list>
                <bean class="org.springframework.web.servlet.view.xml.MarshallingView">
                    <property name="marshaller" ref="jaxbMarshaller" />
                </bean>
            </list>
        </property>
    </bean>
</beans>

控制器

@Controller
@RequestMapping( { "extService" })
public class ExtServiceController {

    protected final static Logger LOGGER = Logger.getLogger(ExtServiceController.class);

    @Autowired
    private UserManagementService userManagementService;    

    // @RequestMapping(value = "/experts", method = RequestMethod.GET, headers = { "Accept=*/*" })
    // @RequestMapping(value = "experts", method = RequestMethod.GET)
    @RequestMapping(value = "experts", method = RequestMethod.GET, headers = { "Accept=application/xml, text/xml" })
    public @ResponseBody
    ExpertDto getExperts() {            
              return new ExpertDto();
    }
}

测试

DefaultHttpClient httpClient = new DefaultHttpClient();

String expertsUrl = "http://localhost:8080/extService/experts";

HttpGet getRequest = new HttpGet(expertsUrl);
getRequest.setHeader(new BasicHeader("Accept", "application/xml"));
// getRequest.setHeader(new BasicHeader("Accept", "text/html"));
// getRequest.setHeader(new BasicHeader("Accept", "*/*"));

HttpResponse response = httpClient.execute(getRequest);
HttpEntity entity = response.getEntity();
InputStream content = entity.getContent();

Answer 1

考虑使用以下方法而不是 @ResponseBody

@RequestMapping(value = "experts", method = RequestMethod.GET)
public @ResponseBody
void getExperts(org.springframework.ui.Model model) {            
      model.addAttribute(new ExpertDto());
}

“未找到任何 ViewResolvers 委托给...”只是一个警告，您可以忽略它。

Answer 2

将 @RequestMapping 注释修改为

@RequestMapping(value = "experts", method = RequestMethod.GET, headers = { "Accept=application/xml" })