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springboot application.properties server.port配置的問題

近年來，springboot以其快速構建方便便捷，開箱即用，約定優(yōu)于配置（Convention Over Configuration）的特性深受廣大開發(fā)者喜愛。

springboot已經(jīng)集成配置好了一套web開發(fā)的默認配置，開發(fā)者可以無需修改任何配置即可開始一個web工程，但是實際情況中有時候開發(fā)者還是需要修改部分默認配置項來使其更加契合自己的項目需求。

下面就其中一個小問題做個記錄

在配置服務啟動的端口時，springboot默認在application.properties配置文件中提供了server.port配置項來

讓開發(fā)者自行配置服務啟動端口號，**但是注意：**

#服務啟動端口號
server.port=8889

該配置項要想生效其實是依賴于項目中內嵌的tomcat容器，如下圖：

解決springboot application.properties server.port配置問題

內嵌tomcat的jar包依賴包含在pom中

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

如果pom中不引人上述依賴，那么項目中不會導入內嵌tomcat的jar包，相應的application.properties配置文件中server.port配置項也將無法生效，因為該配置項實際上修改的就是內嵌tomcat的web端口號。

Spring Boot server.port配置原理

我們經(jīng)常配置server.port=xxx，但其實這是一個比較復雜的過程才生效的，這次講講生效的過程。

1. autoConfigure

本質來源于自動配置

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

解決springboot application.properties server.port配置問題

TomcatServletWebServerFactory

為什么是這個類，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();
	}

最終

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

WebServerFactoryCustomizer對象.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);
	}

這里就將port設置好了。

解決springboot application.properties server.port配置問題