SpringBoot WebFlux Annotation-based RestAPIs
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loveprogramming viết ngày 03/05/2021

https://grokonez.com/spring-framework/spring-webflux/springboot-webflux-annotation-based-programming-model

SpringBoot WebFlux Annotation-based RestAPIs

Reactive programming is about non-blocking applications. And Spring Framework 5 includes a new spring-webflux module, supports Reactive Streams for communicating backpressure across async components and libraries. So in the tutorial, JavaSampleApproach will guide you through the steps for creating a SpringBoot WebFlux Annotation-based restful APIs.

Related posts:

I. Technologies

– Java: 1.8
– Maven: 3.3.9
– Spring Tool Suite: Version 3.9.0.RELEASE
– Spring Boot: 2.0.0.M4

  • Spring Boot Starter Webflux

    II. Spring WebFlux

    Spring Framework 5.0 supports WebFlux with fully asynchronous and non-blocking and does NOT require the Servlet API(Unlike Spring MVC).

Spring WebFlux supports 2 distinct programming models:

  • Annotation-based with @Controller
  • Functional with Java 8 lambda style

In the tutorial, we will introduce WebFlux with Annotation-based.
For starting with WebFlux, SpringBoot supports a collection dependency: spring-boot-starter-webflux.

Sample code:


@RestController
@RequestMapping(value="/api/customer")
public class RestControllerAPIs {
    
    @GetMapping("/")
    public Flux getAll() {
    
        ...
    }
    
    @GetMapping("/{id}")
    public Mono getCustomer(@PathVariable Long id) {
        
        ...
    }
}
  • reactor.core.publisher.Flux: is a standard Publisher representing a reactive sequence of 0..N items, optionally terminated by either a success signal or an error.
  • reactor.core.publisher.Mono: Mono is a specialized Publisher that emits at most single-valued-or-empty result.

    III. Practice

    In the tutorial, We create a SpringBoot project as below:

springboot webflux annotation-based - project structure

Step to do:

  • Create SpringBoot project
  • Create data model
  • Implement Spring WebFlux APIs
  • Run and check results

    1. Create SpringBoot project

    Using SpringToolSuite, create a SpringBoot project with Reactive Web dependency:

springboot webflux reactive - select reactive web

Check pom.xml after creating:

More at:

https://grokonez.com/spring-framework/spring-webflux/springboot-webflux-annotation-based-programming-model

SpringBoot WebFlux Annotation-based RestAPIs

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