本篇文章给大家分享的是有关如何在SpringBoot2中使用WebFlux函数式编程，小编觉得挺实用的，因此分享给大家学习，希望大家阅读完这篇文章后可以有所收获，话不多说，跟着小编一起来看看吧。
新建项目
创建一个项目，pom文件中引入webflux依赖，完整pom文件如下：
<?xml version="1.0" encoding="UTF-8"?> <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com.dalaoyang</groupId> <artifactId>springboot2_webflux</artifactId> <version>0.0.1-SNAPSHOT</version> <packaging>jar</packaging> <name>springboot2_webflux</name> <description>springboot2_webflux</description> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.0.3.RELEASE</version> <relativePath/> <!-- lookup parent from repository --> </parent> <properties> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding> <java.version>1.8</java.version> </properties> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-webflux</artifactId> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build> </project>
首先试试引入WebFlux依赖之后，SpringMvc方式是否还能使用，新建一个HelloController，完整代码如下，执行后发现，是可以正常执行访问的，这其实就是我们所说的注解式编程。
package com.dalaoyang.controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
/**
* @author dalaoyang
* @project springboot_learn
* @package com.dalaoyang.controller
* @email yangyang@dalaoyang.cn
* @date 2018/7/30
*/
@RestController
public class HelloController {
@GetMapping("hello")
public String Hello(){
return "Hello this is SpringWebFlux";
}
}结果如图：
接下来使用函数式编程，首先查阅一下官方文档，如图：
我们需要创建一个HandlerFunction返回值为Mono，新建一个HiHandler，里面写一个方法Hi，完整代码如下：
package com.dalaoyang.handler;
import org.springframework.http.MediaType;
import org.springframework.stereotype.Component;
import org.springframework.web.reactive.function.BodyInserters;
import org.springframework.web.reactive.function.server.ServerRequest;
import org.springframework.web.reactive.function.server.ServerResponse;
import reactor.core.publisher.Mono;
/**
* @author dalaoyang
* @project springboot_learn
* @package com.dalaoyang.handler
* @email yangyang@dalaoyang.cn
* @date 2018/7/30
*/
@Component
public class HiHandler {
public Mono<ServerResponse> Hi(ServerRequest request) {
return ServerResponse.ok().contentType(MediaType.APPLICATION_JSON)
.body(BodyInserters.fromObject("Hi , this is SpringWebFlux"));
}
}其中ServerResponse是相应的封装对象，下面是它的源码，其中包含了响应状态，响应头等等，代码如下：
package org.springframework.web.reactive.function.server;
import java.net.URI;
import java.time.ZonedDateTime;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.function.BiFunction;
import java.util.function.Consumer;
import org.reactivestreams.Publisher;
import org.springframework.core.ParameterizedTypeReference;
import org.springframework.http.CacheControl;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpMethod;
import org.springframework.http.HttpStatus;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseCookie;
import org.springframework.http.codec.HttpMessageWriter;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.util.MultiValueMap;
import org.springframework.web.reactive.function.BodyInserter;
import org.springframework.web.reactive.result.view.ViewResolver;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;
public interface ServerResponse {
HttpStatus statusCode();
HttpHeaders headers();
MultiValueMap<String, ResponseCookie> cookies();
Mono<Void> writeTo(ServerWebExchange var1, ServerResponse.Context var2);
static ServerResponse.BodyBuilder from(ServerResponse other) {
return new DefaultServerResponseBuilder(other);
}
static ServerResponse.BodyBuilder status(HttpStatus status) {
return new DefaultServerResponseBuilder(status);
}
static ServerResponse.BodyBuilder status(int status) {
return new DefaultServerResponseBuilder(status);
}
static ServerResponse.BodyBuilder ok() {
return status(HttpStatus.OK);
}
static ServerResponse.BodyBuilder created(URI location) {
ServerResponse.BodyBuilder builder = status(HttpStatus.CREATED);
return (ServerResponse.BodyBuilder)builder.location(location);
}
static ServerResponse.BodyBuilder accepted() {
return status(HttpStatus.ACCEPTED);
}
static ServerResponse.HeadersBuilder<?> noContent() {
return status(HttpStatus.NO_CONTENT);
}
static ServerResponse.BodyBuilder seeOther(URI location) {
ServerResponse.BodyBuilder builder = status(HttpStatus.SEE_OTHER);
return (ServerResponse.BodyBuilder)builder.location(location);
}
static ServerResponse.BodyBuilder temporaryRedirect(URI location) {
ServerResponse.BodyBuilder builder = status(HttpStatus.TEMPORARY_REDIRECT);
return (ServerResponse.BodyBuilder)builder.location(location);
}
static ServerResponse.BodyBuilder permanentRedirect(URI location) {
ServerResponse.BodyBuilder builder = status(HttpStatus.PERMANENT_REDIRECT);
return (ServerResponse.BodyBuilder)builder.location(location);
}
static ServerResponse.BodyBuilder badRequest() {
return status(HttpStatus.BAD_REQUEST);
}
static ServerResponse.HeadersBuilder<?> notFound() {
return status(HttpStatus.NOT_FOUND);
}
static ServerResponse.BodyBuilder unprocessableEntity() {
return status(HttpStatus.UNPROCESSABLE_ENTITY);
}
public interface Context {
List<HttpMessageWriter<?>> messageWriters();
List<ViewResolver> viewResolvers();
}
public interface BodyBuilder extends ServerResponse.HeadersBuilder<ServerResponse.BodyBuilder> {
ServerResponse.BodyBuilder contentLength(long var1);
ServerResponse.BodyBuilder contentType(MediaType var1);
ServerResponse.BodyBuilder hint(String var1, Object var2);
<T, P extends Publisher<T>> Mono<ServerResponse> body(P var1, Class<T> var2);
<T, P extends Publisher<T>> Mono<ServerResponse> body(P var1, ParameterizedTypeReference<T> var2);
Mono<ServerResponse> syncBody(Object var1);
Mono<ServerResponse> body(BodyInserter<?, ? super ServerHttpResponse> var1);
Mono<ServerResponse> render(String var1, Object... var2);
Mono<ServerResponse> render(String var1, Map<String, ?> var2);
}
public interface HeadersBuilder<B extends ServerResponse.HeadersBuilder<B>> {
B header(String var1, String... var2);
B headers(Consumer<HttpHeaders> var1);
B cookie(ResponseCookie var1);
B cookies(Consumer<MultiValueMap<String, ResponseCookie>> var1);
B allow(HttpMethod... var1);
B allow(Set<HttpMethod> var1);
B eTag(String var1);
B lastModified(ZonedDateTime var1);
B location(URI var1);
B cacheControl(CacheControl var1);
B varyBy(String... var1);
Mono<ServerResponse> build();
Mono<ServerResponse> build(Publisher<Void> var1);
Mono<ServerResponse> build(BiFunction<ServerWebExchange, ServerResponse.Context, Mono<Void>> var1);
}
}在回过头了看上面官方文档的图片，还需要配置一个路由来类似@RequestMapping的功能，通过RouterFunctions.route(RequestPredicate, HandlerFunction)提供了一个路由器函数默认实现，新建一个HiRouter，代码如下：
package com.dalaoyang.router;
import com.dalaoyang.handler.HiHandler;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.MediaType;
import org.springframework.web.reactive.function.server.RequestPredicates;
import org.springframework.web.reactive.function.server.RouterFunction;
import org.springframework.web.reactive.function.server.RouterFunctions;
import org.springframework.web.reactive.function.server.ServerResponse;
/**
* @author dalaoyang
* @project springboot_learn
* @package com.dalaoyang.router
* @email yangyang@dalaoyang.cn
* @date 2018/7/30
*/
@Configuration
public class HiRouter {
@Bean
public RouterFunction<ServerResponse> routeCity(HiHandler hiHandler) {
return RouterFunctions
.route(RequestPredicates.GET("/hi")
.and(RequestPredicates.accept(MediaType.APPLICATION_JSON)),
hiHandler::Hi);
}
}启动项目，通过控制台可以看到，两种方式的映射都被打印出来了，如图所示：
在浏览器访问，http://localhost:8080/hi,结果如图所示:
以上就是如何在SpringBoot2中使用WebFlux函数式编程，小编相信有部分知识点可能是我们日常工作会见到或用到的。希望你能通过这篇文章学到更多知识。更多详情敬请关注亿速云行业资讯频道。
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