Spring REST视图分辨率-不支持的内容类型 [英] Spring REST view resolution - unsupported content type

问题描述

将XML对象Foo发布到/foo.xml时，我无法获得路径扩展视图分辨率，但会收到错误

When posting an XML object Foo to /foo.xml I can't get path extension view resolution to kick in, but get the error

不支持的内容类型:文本/纯文本

Unsupported content type: text/plain

这是未发布任何Content-Type标头的结果.但是favorPathExtention应该消除这种需求.知道为什么不这么做吗?

Which is a result of not posting any Content-Type headers. But favorPathExtention should remove that need. Any idea why it doesn't?

控制器

@RequestMapping(value="/foo.xml", method=ADD, produces="application/xml")
@ResponseStatus(HttpStatus.OK)
public @ResponseBody Foo add(@RequestBody Foo foo)  {
    return foo;
}

配置

@Configuration
@ComponentScan(basePackages="my.pkg.controller")
public class RestWebConfig extends WebMvcConfigurationSupport {

    @Override
    protected void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
        converters.add(new MarshallingHttpMessageConverter(...));
        converters.add(new MappingJackson2HttpMessageConverter());
    }

    @Override
    protected void configureContentNegotiation(ContentNegotiationConfigurer configurer) {
        configurer.favorPathExtension(true)
            .ignoreAcceptHeader(true)
            .useJaf(false)
            .mediaType("json", MediaType.APPLICATION_JSON)
            .mediaType("xml", MediaType.APPLICATION_XML);
    }
}

推荐答案

我认为您误解了内容协商的目的.

I think you've misunderstood the purpose of content negotiation.

内容协商用于响应的生成方式，而不是请求的解析方式.

Content negotiation is for how the response will be generated, not how the request will be parsed.

您得到

不支持的内容类型:文本/纯文本

Unsupported content type: text/plain

因为使用@RequestBody，没有注册的HttpMessageConverter实例可以读取默认的请求内容类型application/octet-stream(或者您的客户端使用text/plain).这一切都发生在RequestResponseBodyMethodProcessor中，该处理为使用@RequestBody注释的参数生成参数.

because, with @RequestBody, there are no registeredHttpMessageConverter instances that can read the default request content-type of application/octet-stream (or maybe your client uses text/plain). This all happens in the RequestResponseBodyMethodProcessor which handles generating an argument for the parameter annotated with @RequestBody.

如果要在请求正文中发送XML或JSON，请设置Content-Type.

If you're going to send XML or JSON in your request body, set the Content-Type.

对于内容协商，使用您的配置和请求，DispatcherServlet将尝试生成内容类型为application/xml的响应.由于@ResponseBody，您将需要能够产生此类内容的HttpMessageConverter.您的MarshallingHttpMessageConverter应该足够了.如果不是这样，您可以编写自己的内容.

As for the content negotiation, with your config and request, the DispatcherServlet will attempt to generate a response with content type application/xml. Because of @ResponseBody, you will need an HttpMessageConverter capable of producing such content. Your MarshallingHttpMessageConverter should be enough. If it isn't, you can write your own.

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