Spring Boot - RestController 反序列化 YAML 上传？

如何配置 Spring Boot RestController 来接受 YAML 上传？

下面的结果是 415。我从调试中可以看到MappingJackson2HttpMessageConverter我的 Spring 上下文中的实例仅支持[application/json;charset=UTF-8, application/*+json;charset=UTF-8]。我不可能是唯一一个尝试这样做的 Spring Boot 用户，而且我很惊讶它没有这样做只是工作- 大多数事情都是在 Spring Boot 中完成的！

我的 POM 中有 YAML 数据格式：

    <dependency>
        <groupId>com.fasterxml.jackson.dataformat</groupId>
        <artifactId>jackson-dataformat-yaml</artifactId>
    </dependency>

我的 RestController 有一个方法：

@RequestMapping(method=RequestMethod.POST, value="/", consumes="application/yaml")
public String upload(@RequestBody Declaration declaration) {
    //Do stuff
}

我的测试：

@Test
public void triggersConvergence() throws Exception {
    ClassPathResource fixture = new ClassPathResource("declaration.yml");
    HttpHeaders requestHeaders = new HttpHeaders();
    requestHeaders.add("Content-Type", "application/yaml");
    requestHeaders.add("Accept", "application/json");

    URI uri = new URI("http://127.0.0.1:"+port);
    byte[] bytes = new byte[(int)fixture.contentLength()];
    fixture.getInputStream().read(bytes);
    RequestEntity<byte[]> postRequest = new RequestEntity<byte[]>(bytes, requestHeaders, HttpMethod.POST, uri);

    ResponseEntity<String> response = rest.exchange(postRequest, String.class);
    assertThat(response.getStatusCode(), is(HttpStatus.OK));
    assertThat(response.getBody(), is("Converged org my-lovely-org"));
}

虽然 Spring 中不提供此功能，但可以使用以下命令轻松添加YAMLMapper http://static.javadoc.io/com.fasterxml.jackson.dataformat/jackson-dataformat-yaml/2.6.0/com/fasterxml/jackson/dataformat/yaml/YAMLMapper.html只需 2 个简单步骤：

1. 定义你自己的HttpMessageConverter https://docs.spring.io/spring/docs/current/javadoc-api/org/springframework/http/converter/HttpMessageConverter.html支持Content-Type: application/x-yaml https://stackoverflow.com/questions/332129/yaml-mime-type:

   final class YamlJackson2HttpMessageConverter extends AbstractJackson2HttpMessageConverter {
       YamlJackson2HttpMessageConverter() {
           super(new YAMLMapper(), MediaType.parseMediaType("application/x-yaml"));
       }
   }
   

2. 注册您的转换器：

   @Configuration
   public class YamlConfiguration extends WebMvcConfigurerAdapter {
       @Override
       public void extendMessageConverters(List<HttpMessageConverter<?>> converters) {
           converters.add(new YamlJackson2HttpMessageConverter());
       }
   }
   

享受控制器方法消耗 and 生产 application/x-yaml https://stackoverflow.com/questions/332129/yaml-mime-type来自 POJO。