Spring BootWebFlux NettyServerCustomizer不工作

Question

@SpringBootApplication
@RestController
@RequestMapping("/test")
public class DemoApplication {

    public static void main(String[] args) {
        SpringApplication.run(DemoApplication.class, args);
    }

    @GetMapping
    public Mono<String> test() {
        return Mono.just("test");
    }

    @Bean
    public NettyServerCustomizer nettyCustomizer() {
        return builder -> builder.port(9909);
    }

}

聚甲醛

<parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.1.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-webflux</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>io.projectreactor</groupId>
            <artifactId>reactor-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

Answer 1

定义NettyServerCustomizer类型的bean本身没有任何效果，您可以使用WebServerFactoryCustomizer获得所需的结果

@Bean
public WebServerFactoryCustomizer getWebServerFactoryCustomizer() {
    WebServerFactoryCustomizer<ConfigurableReactiveWebServerFactory> customizer = factory -> factory.setPort(9909);
    return customizer;
}

还要注意，端口也是使用server.port属性从环境读取的，我认为这是最干净的方式，除此之外，它在属性值的来源方面有很大的灵活性。

如果您想知道为什么NettyServerCustomizer不起作用，对代码的深入研究会发现，这个类没有以任何方式注入到NettyReActiveWebServerFactory中。