无法提取响应：没有合适的 HttpMessageConverter 与 jaxb2marshaller

Question

我在客户端和服务器上都设置了使用 Jaxb2 的 MarshallingMessageConverter

关注this问题。

这是在服务器端：

@Configuration
@EnableWebMvc
public class WebConfig extends WebMvcConfigurerAdapter {

    @Override
    public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
        converters.add(marshallingMessageConverter());
    }

    public MarshallingHttpMessageConverter marshallingMessageConverter() {
        return new MarshallingHttpMessageConverter(jaxb2Marshaller(), jaxb2Marshaller());
    }

    public Jaxb2Marshaller jaxb2Marshaller() {
        Jaxb2Marshaller marshaller = new Jaxb2Marshaller();
        marshaller.setClassesToBeBound(new Class[]{
                User.class
            });
        return marshaller;
    }
}

客户端：

@Configuration
public class RESTConfig {

    @Bean
    public MarshallingHttpMessageConverter marshallingMessageConverter() {
        return new MarshallingHttpMessageConverter(jaxb2Marshaller(), jaxb2Marshaller());
    }

    @Bean
    public Jaxb2Marshaller jaxb2Marshaller() {
        Jaxb2Marshaller marshaller = new Jaxb2Marshaller();
        marshaller.setClassesToBeBound(new Class[] {
            User.class
        });
        return marshaller;
    }

    @Bean
    public RestTemplate restTemplate() {
        RestTemplate restTemplate = new RestTemplate();
        List<HttpMessageConverter<?>> converters = new ArrayList<HttpMessageConverter<?>>();
        //converters.addAll(restTemplate.getMessageConverters());

        converters.add(marshallingMessageConverter());
        restTemplate.setMessageConverters(converters);

        return restTemplate;
    }
}

检查两个日志：

org.springframework.oxm.jaxb.Jaxb2Marshaller createJaxbContextFromClasses
INFO: Creating JAXBContext with classes to be bound [class com.cloudlb.model.User]

当我尝试检索用户时。我得到了这个

org.springframework.web.client.RestClientException: 
Could not extract response: no suitable HttpMessageConverter found for response type [com.cloudlb.model.User] and content type [application/xml]

我错过了什么吗？

我通过将其检索为 String.class 进行检查，它工作正常。以 XML 文件格式返回。

我要实现XML XML Object>

User user = restTemplate.getForObject(url, User.class);

已编辑：这是我的控制器

@Controller
@RequestMapping("/user")
public class UserServiceController {

    @Autowired
    private UserService userService;

    public UserServiceController() {}

    @RequestMapping(value="/{id}", method = RequestMethod.GET)
    @ResponseBody
    public User findUserById(@PathVariable("id") String id) {
        return userService.findById(id);
    }
}

提前谢谢你。

Answer 1

当我配置这个时，我定义了一个 ContentNegotiatingViewResolver 如下：

@Bean
public ContentNegotiatingViewResolver contentNegotiatingViewResolver() {
    ContentNegotiatingViewResolver resolver = new ContentNegotiatingViewResolver();
    Map<String, String> mediaTypes = new HashMap<String, String>();
    mediaTypes.put("xml", "application/xml");
    resolver.setMediaTypes(mediaTypes);

    List<ViewResolver> viewResolvers = new ArrayList<ViewResolver>();
    viewResolvers.add(new BeanNameViewResolver());

    resolver.setViewResolvers(viewResolvers);

    return resolver;
}

然后我从我的控制器返回：

return new ModelAndView("spotView", "spot", spot);

然后在我的配置中，我定义了一个与控制器返回的视图同名的 bean（因为我使用的是 BeanName 解析器）：

@Bean
public MarshallingView spotView() {
    return new MarshallingView(jaxbMarshaller());
}