Spring integration 如何让Spring Integration Http.inboundGateway返回HAL Json？

我将以下属性设置为true“spring.hateoas.use hal作为默认json媒体类型”&添加了org.springframework.boot:spring boot starter hateoas作为依赖项

代码

@Bean
public IntegrationFlow myUserFlow() {
    return IntegrationFlows
            .from(Http.inboundGateway("/user")
                    .requestMapping(r -> r.methods(HttpMethod.GET))
                    .get()
            )
            .handle((payload, headers) -> new MyUser("Joe Blogs")
                    .add(Link.of("http://localhost:8080/account", LinkRelation.of("account"))))
            .get();
}

GET http://localhost:8080/user
HTTP/1.1 200 
connection: Keep-Alive, keep-alive
Content-Type: application/hal+json;charset=UTF-8
Transfer-Encoding: chunked
Date: Mon, 11 Jan 2021 18:31:13 GMT
Keep-Alive: timeout=60

{
  "name": "Joe Blogs",
  "links": [
    {
      "rel": "account",
      "href": "http://localhost:8080/account"
    }
  ]
}

Response code: 200; Time: 19ms; Content length: 87 bytes

响应

@Bean
public IntegrationFlow myUserFlow() {
    return IntegrationFlows
            .from(Http.inboundGateway("/user")
                    .requestMapping(r -> r.methods(HttpMethod.GET))
                    .get()
            )
            .handle((payload, headers) -> new MyUser("Joe Blogs")
                    .add(Link.of("http://localhost:8080/account", LinkRelation.of("account"))))
            .get();
}

GET http://localhost:8080/user
HTTP/1.1 200 
connection: Keep-Alive, keep-alive
Content-Type: application/hal+json;charset=UTF-8
Transfer-Encoding: chunked
Date: Mon, 11 Jan 2021 18:31:13 GMT
Keep-Alive: timeout=60

{
  "name": "Joe Blogs",
  "links": [
    {
      "rel": "account",
      "href": "http://localhost:8080/account"
    }
  ]
}

Response code: 200; Time: 19ms; Content length: 87 bytes

我希望以HAL格式返回响应，例如

{
  "name": "Joe Blogs",
  "_links": [
    {
      "account":{
          "href": "http://localhost:8080/account"
       }
    }
  ]
}

为什么不是这样？我怎样才能做到

---

示例应用程序：

解决方案如下：

public IntegrationFlow myUserFlow(RequestMappingHandlerAdapter requestMappingHandlerAdapter) {
    return IntegrationFlows
            .from(Http.inboundGateway("/user")
                    .messageConverters(requestMappingHandlerAdapter.getMessageConverters().toArray(HttpMessageConverter[]::new))

问题是因为SpringIntegrationHTTP通道适配器不是由SpringBoot自动配置的，它们肯定不知道您的HAL定制

因此，我们需要等待，直到Spring Boot和hateoas定制处理了

RequestMappingHandlerAdapter

。然后我们将其转换器注入我们的

Http.inboundGateway（）

我想说的是，我们可能会考虑在Spring Boot中使用一些自动的工具来实现定制，但是因为我们实际上并没有讨论一些基础设施，比如MVC的

@RequestMapping

，而是一些具体的bean，所以最好还是坚持使用显式配置

---

我不确定为什么我们不能改用

HttpMessageConverters

，但看起来像是

requestmappinghandleadapter

以后配置的，因为这种bean（

integrationflow

）已经解析和创建了。

谢谢你