Spring Boot server.port配置原理

最新推荐文章于 2025-07-07 23:09:33 发布

fenglllle

最新推荐文章于 2025-07-07 23:09:33 发布

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分类专栏： spring boot 文章标签： server.port Spring Boot enbed tomcat

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本文深入探讨了SpringBoot中server.port配置项的生效过程，从autoConfigure机制到WebServerFactoryCustomizerBeanPostProcessor的beanPostProcess原理，再到嵌入式Tomcat的配置流程，解析了Port设置的复杂过程。

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前言

我们经常配置server.port=xxx，但其实这是一个比较复杂的过程才生效的，这次讲讲生效的过程。

1. autoConfigure

本质来源于自动配置

org.springframework.boot.autoconfigure.web.servlet.ServletWebServerFactoryConfiguration

TomcatServletWebServerFactory

为什么是这个类，核心是beanPostProcess原理

@ConfigurationProperties(prefix = "server", ignoreUnknownFields = true)
public class ServerProperties {

	/**
	 * Server HTTP port.
	 */
	private Integer port;

beanPostProcess

public class WebServerFactoryCustomizerBeanPostProcessor implements BeanPostProcessor, BeanFactoryAware {

	private ListableBeanFactory beanFactory;

	private List<WebServerFactoryCustomizer<?>> customizers;


	@Override
	public Object postProcessBeforeInitialization(Object bean, String beanName) throws BeansException {
		if (bean instanceof WebServerFactory) {
			postProcessBeforeInitialization((WebServerFactory) bean);
		}
		return bean;
	}

	
	@SuppressWarnings("unchecked")
	private void postProcessBeforeInitialization(WebServerFactory webServerFactory) {
		LambdaSafe.callbacks(WebServerFactoryCustomizer.class, getCustomizers(), webServerFactory)
				.withLogger(WebServerFactoryCustomizerBeanPostProcessor.class)
				.invoke((customizer) -> customizer.customize(webServerFactory));
	}

    private Collection<WebServerFactoryCustomizer<?>> getCustomizers() {
		if (this.customizers == null) {
			// Look up does not include the parent context
			this.customizers = new ArrayList<>(getWebServerFactoryCustomizerBeans());
			this.customizers.sort(AnnotationAwareOrderComparator.INSTANCE);
			this.customizers = Collections.unmodifiableList(this.customizers);
		}
		return this.customizers;
	}

	@SuppressWarnings({ "unchecked", "rawtypes" })
	private Collection<WebServerFactoryCustomizer<?>> getWebServerFactoryCustomizerBeans() {
		return (Collection) this.beanFactory.getBeansOfType(WebServerFactoryCustomizer.class, false, false).values();
	}

最终beanFactory.getBeansOfType(WebServerFactoryCustomizer.class, false, false).values()

WebServerFactoryCustomizer对象.customize(webServerFactory)

@Configuration
@AutoConfigureOrder(Ordered.HIGHEST_PRECEDENCE)
@ConditionalOnClass(ServletRequest.class)
@ConditionalOnWebApplication(type = Type.SERVLET)
@EnableConfigurationProperties(ServerProperties.class)
@Import({ ServletWebServerFactoryAutoConfiguration.BeanPostProcessorsRegistrar.class,
		ServletWebServerFactoryConfiguration.EmbeddedTomcat.class,
		ServletWebServerFactoryConfiguration.EmbeddedJetty.class,
		ServletWebServerFactoryConfiguration.EmbeddedUndertow.class })
public class ServletWebServerFactoryAutoConfiguration {

	@Bean
	public ServletWebServerFactoryCustomizer servletWebServerFactoryCustomizer(ServerProperties serverProperties) {
		return new ServletWebServerFactoryCustomizer(serverProperties);
	}

这里就将port设置好了。

这里使用函数式编程，lambda表达式，将port的值设置进了

ConfigurableServletWebServerFactory ，即TomcatServletWebServerFactory对象

2. embed tomcat如何使用

tomcat创建时，会通过getBean方式获取工厂

就是 TomcatServletWebServerFactory

然后设置connector，从TomcatServletWebServerFactory读取port，设置connector，设置结束

总结

Spring Boot在解耦的时候绕了很多弯，先@Bean factory对象，然后BeanPostProcess，然后启动embed tomcat 在factory 中new Tomcat 然后设置Connector，设置port。