Spring Reactive get body JSONObject using ServerRequest

Question

i'm spring reactive newbie.

I am trying to use postman to get request information from the server.

First, postman sends information to the server using the post method. Second, we've been working on the server side with the relevant code and getting the request information.

In the following code snippet

I wonder if I can get the JSONObject of the ServerRequest function.

postman body(application/json)

{
    "name": "aaaa",
    "name_order": ["aa", "bb", "cc"],
    "type": "12",
    "query": ""
}

java (RouterFunction)

import com.ntels.io.input.handler.RestInHandler;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.MediaType;
import org.springframework.web.reactive.config.EnableWebFlux;
import org.springframework.web.reactive.config.WebFluxConfigurer;
import org.springframework.web.reactive.function.server.*;

import static org.springframework.web.reactive.function.server.RequestPredicates.GET;
import static org.springframework.web.reactive.function.server.RequestPredicates.POST;
import static org.springframework.web.reactive.function.server.RequestPredicates.PUT;
import static org.springframework.web.reactive.function.server.RequestPredicates.DELETE;

@Configuration
@EnableWebFlux
public class RestConfig implements WebFluxConfigurer {

    @Bean
    public RouterFunction<ServerResponse> routes(RestInHandler restInHandler){
        return RouterFunctions.route(POST("/input/event").
        and(RequestPredicates.accept(MediaType.APPLICATION_JSON)), restInHandler::toRESTInVerticle);
    }
}

java (Handler)

public Mono<ServerResponse> toRESTInVerticle(ServerRequest serverRequest) {
    String serverRequestUrl = serverRequest.uri().toString();

    System.out.println("RestInHandler test in");
    System.out.println(serverRequest.method());
    System.out.println(serverRequest.headers());
    System.out.println(serverRequest.uri().toString());

    // how can i get the jsonbody using serverrequest

    // testing..

    // Mono<JSONObject> jsonObjectMono = serverRequest.bodyToMono(JSONObject.class);
    // Flux<JSONObject> jsonObjectFlux = serverRequest.bodyToFlux(JSONObject.class);
-> MonoOnErrorResume

    return (Mono<ServerResponse>) ServerResponse.ok();
}

Answer 1

I think you can try to register a kind of 'callback' in the next way:

        return request.bodyToMono(JSONObject.class)
                  .doOnNext(jsonObject -> // testing..)
                  .then(ServerResponse.ok().build());

Also, I noticed that you are casting ServerResponse.ok() to Mono<ServerResponse>. I think it will not cast. Use ServerResponse.ok().build() to make Mono<ServerResponse>.