SpringBoot server.port配置原理详解

SpringBoot server.port配置原理详解

目录SpringBoot server.port配置原理1. autoConfigure2. embed tomcat如何使用小结一下server.port不起作用

SpringBoot server.port配置原理

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> customizers;

@Override

public Object postProcessBeforeInitialization(Object bean, String beanName) throws BeansException {

if (bean instanceof WebServerFactory) {

postProcessBehttp://foreInitialization((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> 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> 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)

tqCCOvBR

@Configuration

@AutoConfigureOrder(Ordered.HIGHEST_PRECEDENCE)

@ConditionalOnClass(ServletRequest.class)

@ConditionalOnWebApplication(type = Type.SERVLET)

@EnableConfigurationProperties(ServerProperties.class)

@Import({ SetqCCOvBRrvletWebServerFactoryAutoConfiguration.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

小结一下

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。

server.port不起作用

启动项目报错：

org.apache.catalina.LifecycleException: Protocol handler start failed

怀疑可能端口号冲突，在 application.properties 添加 server.port=8080 未生效

立刻百度一圈没找到答案（感觉可能自己犯的错误太低级），突然想起可能是环境配置里面的配置给覆盖了

#读取环境配置dev(开发)/pro(生产)/test(测试)

spring.profiles.active=dev

找到 application-dev.properties、application-prod.properties 发现果然存在

按照配置的 dev 找到 application-dev.properties 修改 server.port=8080启动生效

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