Calling Micro-service using WebClient Sprint 5 reactor web

问题

I am calling a micro-service in my rest controller. It works fine when ever there is a successful response from the Micro-service but if there is some error response I fails to pass on the error response back to user. Below is the sample code.

 @GetMapping("/{id}/users/all")
public Mono<Employee> findAllProfiles(@PathVariable("id") UUID organisationId,
                                           @RequestHeader(name = "Authorization", required = false) String oauthJwt) {
    return webClient.get().uri(prepareUrl("{id}/users/all"), organisationId)
            .header("Authorization", oauthJwt).accept(MediaType.APPLICATION_JSON)
            .exchange().then(response -> response.bodyToMono(Employee.class));
}

Now if there is any JSON response with error code then web client does not pass on the error response to the controller due to which no information is propagated to the api end user.

回答1:

You should be able to chain methods from the Mono API. Look for "onError" to see a number of options which allow you to define the behavior when there is an error.

For example, if you wanted to return an "empty" Employee, you could do the following:

.exchange()
.then(response -> response.bodyToMono(Employee.class))
.onErrorReturn(new Employee());

来源：https://stackoverflow.com/questions/42045267/calling-micro-service-using-webclient-sprint-5-reactor-web