Kotlin Spring Reactive Webflux-处理WebClient错误

Question

我在尝试处理调用Spring WebFlux的web客户机的不同错误时遇到了麻烦。

    return request
            .bodyToMono(InputMessage::class.java)
            .flatMap { inputMessage ->
                client
                        .get()
                        .uri { builder ->
                            builder.path("/message")
                                    .queryParam("message", inputMessage.message)
                                    .build()
                        }
                        .retrieve()
                        .onStatus({t: HttpStatus -> t.is5xxServerError}, {c: ClientResponse -> Mono.error(Throwable("Internal Server Error - try again later"))})
                        .bodyToMono(ListOfAddresses::class.java)
            }
            .flatMap { s -> ServerResponse.ok().syncBody(s) }

    return request
            .bodyToMono(InputMessage::class.java)
            .flatMap { inputMessage ->
                client
                        .get()
                        .uri { builder ->
                            builder.path("/message")
                                    .queryParam("message", inputMessage.message)
                                    .build()
                        }
                        .retrieve()
                        .onStatus({t: HttpStatus -> t.is5xxServerError}, {c: ClientResponse -> Mono.error(Throwable("Internal Server Error - try again later"))})
                        .bodyToMono(ListOfAddresses::class.java)
            }
            .flatMap { s -> ServerResponse.ok().syncBody(s) }
            .onErrorResume { e -> Mono.just("Error " + e.message)
                    .flatMap { s -> ServerResponse.ok().syncBody(s) } }

我如何修改我的代码，使它返回我生成的自定义消息？

Answer 1

根据WebFlux文档，您可以使用exchangeTomono()或awaitexchange{}进行错误处理。

Mono<Object> entityMono = client.get()
    .uri("/persons/1")
    .accept(MediaType.APPLICATION_JSON)
    .exchangeToMono(response -> {
        if (response.statusCode().equals(HttpStatus.OK)) {
            return response.bodyToMono(Person.class);
        }
        else if (response.statusCode().is4xxClientError()) {
            // Suppress error status code
            return response.bodyToMono(ErrorContainer.class);
        }
        else {
            // Turn to error
            return response.createException().flatMap(Mono::error);
        }
    });

从上面的WebFlux链接复制的代码。