How Java implements asynchronous programming using Spring Reactors

Spring Reactor is a programming model based on the concept of responsive flow processing, used to implement asynchronous, non blocking, and scalable applications. It is an implementation based on the responsive stream specification and provides operators similar to the Stream API of Java 8+. Using Spring Reactors, asynchronous event flows can be modeled and composed in an explicit manner. Here are some commonly used key methods: 1. Flux: Represents a responsive sequence flow containing 0 to multiple elements. Flux objects can be created in various ways, such as directly assigning multiple elements, generating from collections, arrays, asynchronous streams, or other Flux objects. The following is a simple example code: Flux<String> flux = Flux.just("hello", "world"); flux.subscribe(System.out::println); Maven Dependency: <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-webflux</artifactId> </dependency> 2. Mono: Represents a responsive sequence flow containing 0 or 1 elements. Mono objects can be created in various ways, such as directly assigning elements, generating from methods that can return elements, and converting Flux objects. The following is a simple example code: Mono<String> mono = Mono.just("hello"); mono.subscribe(System.out::println); Maven Dependency: <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-webflux</artifactId> </dependency> 3. Map: Transforms each element in the sequence flow through a transformation function and returns a new sequence flow. The following is a simple example code: Flux<Integer> flux = Flux.just(1, 2, 3); Flux<Integer> squaredFlux = flux.map(i -> i * i); squaredFlux.subscribe(System.out::println); 4. FlatMap: Transforms each element in the sequence flow into a new sequence flow through a transformation function, and merges these sequence flows into a new sequence flow. The following is a simple example code: Flux<String> flux = Flux.just("hello", "world"); Flux<Character> characterFlux = flux.flatMap(s -> Flux.fromArray(s.toCharArray())); characterFlux.subscribe(System.out::println); These are brief introductions and sample code for some commonly used methods and operators in Spring Reactors. When using, it is necessary to introduce corresponding Maven dependencies. For example, in the Spring Boot project, the 'spring boot starter webflux' dependency can be introduced.