springboot情操陶冶-web配置(一) (2)

创建webServerFactory类

@Bean public ServletWebServerFactoryCustomizer servletWebServerFactoryCustomizer( ServerProperties serverProperties) { return new ServletWebServerFactoryCustomizer(serverProperties); } @Bean @ConditionalOnClass(name = "org.apache.catalina.startup.Tomcat") public TomcatServletWebServerFactoryCustomizer tomcatServletWebServerFactoryCustomizer( ServerProperties serverProperties) { return new TomcatServletWebServerFactoryCustomizer(serverProperties); }

这两个bean类和上文中的TomcatWebServerFactoryCustomizer很相似，但仔细阅读源码之后便发现其实这只是tomcat配置的分工处理，小结如下

TomcatWebServerFactoryCustomizer 配置tomcat的主要信息，包含remoteIpValue、connector(最大/最小可接收线程、最大可接收头部大小等等)、uriEncoding、connectionTimeout、maxConnection等属性

TomcatServletWebServerFactoryCustomizer 配置tomcat的额外信息，redirectContextRoot(是否在请求根上下文时转发，true则转发路径为/demoWeb/)和useRelativeRedirects(是否使用相对路径)等路径跳转问题处理

ServletWebServerFactoryCustomizer 主要配置tomcat的servlet的信息，包含端口、上下文路径、应用名、Session配置、Servlet携带的初始变量等等

通过上述的三个bean类便基本完成了基本的tomcat配置，其都是WebServerFactoryCustomizer接口的实现类，那么是被谁来统一调用以完成上述的配置呢？

1.首先引入了WebServerFactory工厂类，此点可直接看由上述@Import引入的EmbeddedTomcat分析可得

@Configuration @ConditionalOnClass({ Servlet.class, Tomcat.class, UpgradeProtocol.class }) @ConditionalOnMissingBean(value = ServletWebServerFactory.class, search = SearchStrategy.CURRENT) public static class EmbeddedTomcat { @Bean public TomcatServletWebServerFactory tomcatServletWebServerFactory() { return new TomcatServletWebServerFactory(); } }

创建了TomcatServletWebServerFactory的tomcat容器，其余的web容器读者可自行分析

2.最后通过beanPostProcessor接口来完成相应的容器初始化
由@Import引入的BeanPostProcessorsRegistrar类，注册了webServerFactoryCustomizerBeanPostProcessor类来完成相应的tomcat个性化配置

// 初始化上述的WebServerFactory对象前操作 public Object postProcessBeforeInitialization(Object bean, String beanName) throws BeansException { if (bean instanceof WebServerFactory) { this.postProcessBeforeInitialization((WebServerFactory)bean); } return bean; } // 调用所有实现了WebServerFactoryCustomizer接口的对象 private void postProcessBeforeInitialization(WebServerFactory webServerFactory) { ((Callbacks)LambdaSafe.callbacks(WebServerFactoryCustomizer.class, this.getCustomizers(), webServerFactory, new Object[0]).withLogger(WebServerFactoryCustomizerBeanPostProcessor.class)).invoke((customizer) -> { customizer.customize(webServerFactory); }); } // 查找当前bean工厂中所有类型为WebServerFactoryCustomizer接口对象集合 private Collection<WebServerFactoryCustomizer<?>> getCustomizers() { if (this.customizers == null) { this.customizers = new ArrayList(this.getWebServerFactoryCustomizerBeans()); this.customizers.sort(AnnotationAwareOrderComparator.INSTANCE); this.customizers = Collections.unmodifiableList(this.customizers); } return this.customizers; } private Collection<WebServerFactoryCustomizer<?>> getWebServerFactoryCustomizerBeans() { return this.beanFactory.getBeansOfType(WebServerFactoryCustomizer.class, false, false).values(); }

具体的解析见上述的代码注释，其实也很简单并一目了然，所以如果用户想在tomcat上再作个性化的需求，可自行实现WebServerFactoryCustomizer接口并注册至bean工厂即可

@Configuration public MyWebServerFactoryCustomizer implements WebServerFactoryCustomizer<ConfigurableServletWebServerFactory>{ @Override public void customize(ConfigurableServletWebServerFactory factory) { PropertyMapper map = PropertyMapper.get().alwaysApplyingWhenNonNull(); // do personal binding } } 小结

本文只讲述tomcat的相关配置，并举例说明了其port/contextPath的应用配置，更多的配置读者可采用springboot实现的带server前缀的配置以及自行实现WebServerFactoryCustomizer接口去实现