ResponseEntity< Mono>有什么区别?和Mono< ResponseEntity>作为休息控制器的返回类型 [英] what is the difference between ResponseEntity<Mono> and Mono<ResponseEntity> as a return type of a rest controller

问题描述

在Spring Webflux中，ResponseEntity< Mono>有什么区别?与Mono< ResponseEntity>作为休息控制器的返回类型?

In Spring Webflux, what's the difference between ResponseEntity<Mono> versus Mono<ResponseEntity> as a return type of a rest controller?

什么时候最合适?

在此问题之后，假设我需要返回一个列表，或者说Foo的几个元素，有很多返回Flux的示例.返回ResponseEntity< Flux>是否有意义还是Flux< ResponseEntity>?

Following up on this question, let's say I need to return a list, or let's say several elements of Foo, there are many examples of returning Flux. Would it make sense to return ResponseEntity<Flux> or Flux<ResponseEntity>?

当我寻找这个问题时，我在这里发现了同样的问题: https://github.com/spring-projects/spring-framework/issues/22614 ，但没有答案，我搜索了spring文档，但未找到任何信息.

When I'm looking for this question, I found the same question posted here: https://github.com/spring-projects/spring-framework/issues/22614, but no answer, I searched spring docs, but find no info.

感谢您的帮助.

推荐答案

以下是您可以使用 ResponseEntity 返回值进行的各种选择:

Here are the various options you can make with a ResponseEntity return value:

• ResponseEntity< Mono< T>> 或 ResponseEntity< Flux< T>> -这使响应状态和标头在提供主体时立即已知稍后异步进行.主体是 Mono 还是 Flux 取决于响应具有多少个值.
• Mono< ResponseEntity< T>> -这在以后的一点上异步提供了全部三个-响应状态，标头和正文.IT允许响应状态和标头根据异步请求处理的结果而变化.
• Mono< ResponseEntity< Mono< T>>>或 Mono< ResponseEntity< Flux< T>> 也是可能的，但不太常见.它们首先异步地提供响应状态和标头，然后异步地提供响应主体，之后又异步地提供响应主体.

• ResponseEntity<Mono<T>> or ResponseEntity<Flux<T>> -- this makes the response status and headers known immediately while the body is provided asynchronously at a later point. Whether the body is Mono or Flux depends on how many values the response has.
• Mono<ResponseEntity<T>> -- this provides all three -- response status, headers, and body, asynchronously at a later point. IT allows the response status and headers to vary depending on the outcome of asynchronous request handling.
• Mono<ResponseEntity<Mono<T>>> or Mono<ResponseEntity<Flux<T>>> are also possible but less common. They provide the response status and headers asynchronously first and then the response body, also asynchronously at a second point later.

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