Spring WebFlux 是 Spring 5.0 推出的新的Web框架,主要是使用新的非阻塞(NIO)编程模型提高在某些场景下Web服务性能。本实验手册给学员演示如何使用该框架。
构建项目
构建一个新的 maven 项目,
groupId: cn.com.hohistar.spbt
artifactId: webflux-starter
然后将 pom.xml 文件修改为以下内容:
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| <?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 https://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.2.2.RELEASE</version> <relativePath/> </parent> <groupId>cn.com.hohistar.spbt</groupId> <artifactId>webflux-starter</artifactId> <version>0.0.1-SNAPSHOT</version> <name>webflux-starter</name> <description>Demo project for Spring Boot</description>
<properties> <java.version>1.8</java.version> </properties>
<dependencies> <dependency> <groupId>org.springframework.boot.experimental</groupId> <artifactId>spring-boot-starter-data-r2dbc</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-webflux</artifactId> </dependency>
<dependency> <groupId>com.h2database</groupId> <artifactId>h2</artifactId> <scope>runtime</scope> </dependency> <dependency> <groupId>io.r2dbc</groupId> <artifactId>r2dbc-h2</artifactId> <scope>runtime</scope> </dependency> <dependency> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> <optional>true</optional> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> <exclusions> <exclusion> <groupId>org.junit.vintage</groupId> <artifactId>junit-vintage-engine</artifactId> </exclusion> </exclusions> </dependency> <dependency> <groupId>org.springframework.boot.experimental</groupId> <artifactId>spring-boot-test-autoconfigure-r2dbc</artifactId> <scope>test</scope> </dependency> <dependency> <groupId>io.projectreactor</groupId> <artifactId>reactor-test</artifactId> <scope>test</scope> </dependency> </dependencies>
<dependencyManagement> <dependencies> <dependency> <groupId>org.springframework.boot.experimental</groupId> <artifactId>spring-boot-bom-r2dbc</artifactId> <version>0.1.0.M3</version> <type>pom</type> <scope>import</scope> </dependency> </dependencies> </dependencyManagement>
<build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build>
<repositories> <repository> <id>spring-milestones</id> <name>Spring Milestones</name> <url>https://repo.spring.io/milestone</url> </repository> </repositories> </project>
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新建Model类
新建名为: cn.com.hohistar.spbt.webfluxstarter.model 的包,然后在包中新建一个名为 Todo 的类, 内容为:
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| @Data @AllArgsConstructor public class Todo {
private Integer id;
private String title;
private String desc; }
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新建Api接口
新建名为: cn.com.hohistar.spbt.webfluxstarter.api 的包,然后在包中新建名为: TodoApi 的类, 内容为:
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| @RestController public class TodoFluxApi {
@GetMapping("/api/todo") public Flux<Todo> getAllTodos() {
Flux<Todo> res = Flux.fromArray(new Todo[] { new Todo(1, "todo1", "desc1"), new Todo(2, "todo2", "desc2")}); return res; } }
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新建启动类
在包: cn.com.hohistar.spbt.webfluxstarter 中新建一个名为: WebfluxStarterApplication 的类,内容为:
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| @SpringBootApplication public class WebfluxStarterApplication {
public static void main(String[] args) {
SpringApplication.run(WebfluxStarterApplication.class, args); } }
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运行程序
启动程序,运行 WebfluxStarterApplication, 将看到系统出现类似如下的反馈:
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| /\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \ ( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \ \\/ ___)| |_)| | | | | || (_| | ) ) ) ) ' |____| .__|_| |_|_| |_\__, | / / / / =========|_|==============|___/=/_/_/_/ :: Spring Boot :: (v2.2.2.RELEASE)
2019-12-13 08:35:53.692 INFO 47409 --- [ main] c.c.h.s.w.WebfluxStarterApplication : Starting WebfluxStarterApplication on JinideMacBook-Pro.local with PID 47409 (/Users/jini/Study/Spring/springboot/webflux-starter/target/classes started by jini in /Users/jini/Study/Spring/springboot/webflux-starter) 2019-12-13 08:35:53.696 INFO 47409 --- [ main] c.c.h.s.w.WebfluxStarterApplication : No active profile set, falling back to default profiles: default 2019-12-13 08:35:55.522 INFO 47409 --- [ main] .s.d.r.c.RepositoryConfigurationDelegate : Bootstrapping Spring Data R2DBC repositories in DEFAULT mode. 2019-12-13 08:35:55.551 INFO 47409 --- [ main] .s.d.r.c.RepositoryConfigurationDelegate : Finished Spring Data repository scanning in 22ms. Found 0 R2DBC repository interfaces. 2019-12-13 08:35:57.056 INFO 47409 --- [ main] o.s.b.web.embedded.netty.NettyWebServer : Netty started on port(s): 8080 2019-12-13 08:35:57.061 INFO 47409 --- [ main] c.c.h.s.w.WebfluxStarterApplication : Started WebfluxStarterApplication in 4.58 seconds (JVM running for 6.573)
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注意:这里已经不再是启动 tomcat, 而是直接使用 Netty库了
然后在浏览器中访问:
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| http://localhost:8080/api/todo
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可以看到浏览器中显示:
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| [{"id":1,"title":"todo1","desc":"desc1"},{"id":2,"title":"todo2","desc":"desc2"}]
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