Spring 5 Reactive中的HTTP响应异常处理 [英] HTTP Response Exception Handling in Spring 5 Reactive

问题描述

我正在使用带有WebFlux响应式启动程序的Spring Boot 2和Spring 5开发一些响应式微服务。

I'm developing some reactive microservices using Spring Boot 2 and Spring 5 with WebFlux reactive starter.

我面临以下问题：我想处理所有问题我从调用另一个REST服务收到的HTTP状态，并在收到一些错误的HTTP状态时引发异常。例如，当我调用一个端点并收到404 HTTP状态时，我想抛出一个异常，并在某些ExceptionHandler类中处理该异常，就像在Spring 4中使用 @的方式一样ControllerAdvice 。

I'm facing the following problem: I want to handle all HTTP Statuses that I receive from calling another REST Services and throws an exception when I receive some bad HTTP Status. For example, when I call an endpoint and I receive an 404 HTTP Status, I want to throw an exception and that exception to be handled in some ExceptionHandler class, just like the way it was in Spring 4 with @ControllerAdvice.

执行此操作的正确方法是什么？希望能收到一些好的建议。

What is the right way to do this? Hope to receive some good suggestions.

推荐答案

这可以分为两个部分解决。

This can be addressed in two independent parts.

使用 WebClient 时，您可以从远程服务。默认情况下，所有 4xx 和 5xx 客户端响应都将变为 WebClientResponseException 。因此，您可以直接在WebFlux应用程序中处理这些异常。

When using WebClient, you can receive HTTP 404 responses from remote services. By default, all 4xx and 5xx client responses will be turned into WebClientResponseException. So you can directly handle those exceptions in your WebFlux app.

如果您只想将404响应转换为自定义异常，则可以执行以下操作：

If you'd like to turn only 404 responses into custom exceptions, you can do the following:

WebClient webClient = //...
webClient.get().uri("/persons/1")
  .retrieve()
  .onStatus(httpStatus -> HttpStatus.NOT_FOUND.equals(httpStatus),
                        clientResponse -> Mono.error(new MyCustomException()))
  .bodyToMono(...);

这显然是根据每个客户致电完成的。

This is obviously done on a per client call basis.

您可以使用 ExchangeFilterFunction 以更可重用的方式实现相同目的，而您可以在 WebClient 上进行一次设置。 code>实例如下：

You can achieve the same in a more reusable way with an ExchangeFilterFunction that you can set once and for all on a WebClient instance like this:

WebClient.builder().filter(myExchangeFilterFunction)...

如何在WebFlux应用程序中处理自定义异常

使用Spring WebFlux带注释，您可以使用带有 @ExceptionHandler 注释的方法来处理异常（请参阅 Spring框架参考文档）。

How to handle custom exceptions in WebFlux apps

With Spring WebFlux with annotations, you can handle exceptions with methods annotated with @ExceptionHandler (see Spring Framework reference documentation).

注意：可以使用 WebExceptionHandler ，但是它的级别很低，因为那里没有高级支持：您需要使用缓冲区手动编写响应威瑟任何对序列化的支持。

Note: using a WebExceptionHandler is possible, but it's quite low level as you'll have no high-level support there: you'll need to manually write the response with buffers without any support for serialization.

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