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SpringBoot配置嵌入式Servlet容器和使用外置Servlet容器的教程圖解

瀏覽:14日期:2023-08-28 09:44:50

配置嵌入式Servlet容器

SpringBoot默認(rèn)使用Tomcat作為嵌入式的Servlet容器;

SpringBoot配置嵌入式Servlet容器和使用外置Servlet容器的教程圖解

問(wèn)題?

1)、如何定制和修改Servlet容器的相關(guān)配置;

1、修改和server有關(guān)的配置(ServerProperties【也是EmbeddedServletContainerCustomizer】);

server.port=8081server.context-path=/crudserver.tomcat.uri-encoding=UTF-8//通用的Servlet容器設(shè)置server.xxx//Tomcat的設(shè)置server.tomcat.xxx

2、編寫一個(gè)EmbeddedServletContainerCustomizer:嵌入式的Servlet容器的定制器;來(lái)修改Servlet容器的配置(1.x)

在Spring Boot2.0以上配置嵌入式Servlet容器時(shí)EmbeddedServletContainerCustomizer類不存在,被WebServerFactoryCustomizer替代。

1.x

@Bean //一定要將這個(gè)定制器加入到容器中public EmbeddedServletContainerCustomizer embeddedServletContainerCustomizer(){ return new WebServerFactoryCustomizer<ConfigurableWebServerFactory> { //定制嵌入式的Servlet容器相關(guān)的規(guī)則 @Override public void customize(ConfigurableWebServerFactory factory) { container.setPort(8083); } };}

2.x

@Bean //一定要將這個(gè)定制器加入到容器中public EmbeddedServletContainerCustomizer embeddedServletContainerCustomizer(){ return new EmbeddedServletContainerCustomizer() { //定制嵌入式的Servlet容器相關(guān)的規(guī)則 @Override public void customize(ConfigurableEmbeddedServletContainer container) { container.setPort(8083); } };}

2)、注冊(cè)Servlet三大組件【Servlet、Filter、Listener】

由于SpringBoot默認(rèn)是以jar包的方式啟動(dòng)嵌入式的Servlet容器來(lái)啟動(dòng)SpringBoot的web應(yīng)用,沒有web.xml文件。

注冊(cè)三大組件用以下方式

ServletRegistrationBean

//注冊(cè)三大組件@Beanpublic ServletRegistrationBean myServlet(){ ServletRegistrationBean registrationBean = new ServletRegistrationBean(new MyServlet(),'/myServlet'); return registrationBean;}

FilterRegistrationBean

@Beanpublic FilterRegistrationBean myFilter(){ FilterRegistrationBean registrationBean = new FilterRegistrationBean(); registrationBean.setFilter(new MyFilter()); registrationBean.setUrlPatterns(Arrays.asList('/hello','/myServlet')); return registrationBean;}

ServletListenerRegistrationBean

@Beanpublic ServletListenerRegistrationBean myListener(){ ServletListenerRegistrationBean<MyListener> registrationBean = new ServletListenerRegistrationBean<>(new MyListener()); return registrationBean;}

SpringBoot幫我們自動(dòng)SpringMVC的時(shí)候,自動(dòng)的注冊(cè)SpringMVC的前端控制器;DIspatcherServlet;

DispatcherServletAutoConfiguration中:

@Bean(name = DEFAULT_DISPATCHER_SERVLET_REGISTRATION_BEAN_NAME)@ConditionalOnBean(value = DispatcherServlet.class, name = DEFAULT_DISPATCHER_SERVLET_BEAN_NAME)public ServletRegistrationBean dispatcherServletRegistration( DispatcherServlet dispatcherServlet) { ServletRegistrationBean registration = new ServletRegistrationBean( dispatcherServlet, this.serverProperties.getServletMapping()); //默認(rèn)攔截: / 所有請(qǐng)求;包靜態(tài)資源,但是不攔截jsp請(qǐng)求; /*會(huì)攔截jsp //可以通過(guò)server.servletPath來(lái)修改SpringMVC前端控制器默認(rèn)攔截的請(qǐng)求路徑 registration.setName(DEFAULT_DISPATCHER_SERVLET_BEAN_NAME); registration.setLoadOnStartup( this.webMvcProperties.getServlet().getLoadOnStartup()); if (this.multipartConfig != null) { registration.setMultipartConfig(this.multipartConfig); } return registration;}

2)、SpringBoot能不能支持其他的Servlet容器;

3)、替換為其他嵌入式Servlet容器

SpringBoot配置嵌入式Servlet容器和使用外置Servlet容器的教程圖解

默認(rèn)支持:

Tomcat(默認(rèn)使用)

<dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> 引入web模塊默認(rèn)就是使用嵌入式的Tomcat作為Servlet容器;</dependency>

Jetty

<!-- 引入web模塊 --><dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> <exclusions> <exclusion> <artifactId>spring-boot-starter-tomcat</artifactId> <groupId>org.springframework.boot</groupId> </exclusion> </exclusions></dependency><!--引入其他的Servlet容器--><dependency> <artifactId>spring-boot-starter-jetty</artifactId> <groupId>org.springframework.boot</groupId></dependency>

Undertow

<!-- 引入web模塊 --><dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> <exclusions> <exclusion> <artifactId>spring-boot-starter-tomcat</artifactId> <groupId>org.springframework.boot</groupId> </exclusion> </exclusions></dependency><!--引入其他的Servlet容器--><dependency> <artifactId>spring-boot-starter-undertow</artifactId> <groupId>org.springframework.boot</groupId></dependency>

4)、嵌入式Servlet容器自動(dòng)配置原理;

SpringBoot2.X原理略有不同

由EmbeddedWebServerFactoryCustomizerAutoConfiguration(嵌入式web服務(wù)工廠定制器自動(dòng)配置類)而不是EmbeddedServletContainerAutoConfiguration(嵌入式的Servlet容器自動(dòng)配置),根據(jù)導(dǎo)入的依賴信息,該配置類會(huì)自動(dòng)創(chuàng)建相應(yīng)類型的容器工廠定制器(目前Spring Boot 2.x 版本支持tomcat、jetty、undertow、netty),以tomcat為例,這里會(huì)創(chuàng)建TomcatWebServerFactoryCustomizer組件:

@Configuration(proxyBeanMethods = false)@ConditionalOnWebApplication//指定類ServerProperties(Servlet容器相關(guān)的配置類)中的ConfigurationProperties功能,將配置文件中對(duì)應(yīng)的屬性值與配置類中的屬性值進(jìn)行映射,并將該配置類添加到IOC容器中@EnableConfigurationProperties(ServerProperties.class)public class EmbeddedWebServerFactoryCustomizerAutoConfiguration {/** * Nested configuration if Tomcat is being used. */ @Configuration(proxyBeanMethods = false) //導(dǎo)入的Servlet依賴為Tomcat,則創(chuàng)建Tomcat web服務(wù)工廠定制器 @ConditionalOnClass({ Tomcat.class, UpgradeProtocol.class }) public static class TomcatWebServerFactoryCustomizerConfiguration { @Bean public TomcatWebServerFactoryCustomizer tomcatWebServerFactoryCustomizer(Environment environment,ServerProperties serverProperties) { return new TomcatWebServerFactoryCustomizer(environment, serverProperties); } } ...}

1.X中通過(guò)EmbeddedServletContainerAutoConfiguration:嵌入式的Servlet容器自動(dòng)配置類創(chuàng)建組件

@AutoConfigureOrder(Ordered.HIGHEST_PRECEDENCE)@Configuration@ConditionalOnWebApplication@Import(BeanPostProcessorsRegistrar.class)//導(dǎo)入BeanPostProcessorsRegistrar:Spring注解版;給容器中導(dǎo)入一些組件//導(dǎo)入了EmbeddedServletContainerCustomizerBeanPostProcessor://后置處理器:bean初始化前后(創(chuàng)建完對(duì)象,還沒賦值賦值)執(zhí)行初始化工作public class EmbeddedServletContainerAutoConfiguration { @Configuration@ConditionalOnClass({ Servlet.class, Tomcat.class })//判斷當(dāng)前是否引入了Tomcat依賴;@ConditionalOnMissingBean(value = EmbeddedServletContainerFactory.class, search = SearchStrategy.CURRENT)//判斷當(dāng)前容器沒有用戶自己定義EmbeddedServletContainerFactory:嵌入式的Servlet容器工廠;作用:創(chuàng)建嵌入式的Servlet容器public static class EmbeddedTomcat {@Beanpublic TomcatEmbeddedServletContainerFactory tomcatEmbeddedServletContainerFactory() {return new TomcatEmbeddedServletContainerFactory();}} /** * Nested configuration if Jetty is being used. */@Configuration@ConditionalOnClass({ Servlet.class, Server.class, Loader.class,WebAppContext.class })@ConditionalOnMissingBean(value = EmbeddedServletContainerFactory.class, search = SearchStrategy.CURRENT)public static class EmbeddedJetty {@Beanpublic JettyEmbeddedServletContainerFactory jettyEmbeddedServletContainerFactory() {return new JettyEmbeddedServletContainerFactory();}}/** * Nested configuration if Undertow is being used. */@Configuration@ConditionalOnClass({ Servlet.class, Undertow.class, SslClientAuthMode.class })@ConditionalOnMissingBean(value = EmbeddedServletContainerFactory.class, search = SearchStrategy.CURRENT)public static class EmbeddedUndertow {@Beanpublic UndertowEmbeddedServletContainerFactory undertowEmbeddedServletContainerFactory() {return new UndertowEmbeddedServletContainerFactory();}}

1)、EmbeddedServletContainerFactory(嵌入式Servlet容器工廠)

public interface EmbeddedServletContainerFactory { //獲取嵌入式的Servlet容器 EmbeddedServletContainer getEmbeddedServletContainer( ServletContextInitializer... initializers);}

SpringBoot配置嵌入式Servlet容器和使用外置Servlet容器的教程圖解

2)、EmbeddedServletContainer:(嵌入式的Servlet容器)

SpringBoot配置嵌入式Servlet容器和使用外置Servlet容器的教程圖解

3)、以TomcatEmbeddedServletContainerFactory為例

@Overridepublic EmbeddedServletContainer getEmbeddedServletContainer( ServletContextInitializer... initializers) { //創(chuàng)建一個(gè)Tomcat Tomcat tomcat = new Tomcat(); //配置Tomcat的基本環(huán)節(jié) File baseDir = (this.baseDirectory != null ? this.baseDirectory : createTempDir('tomcat')); tomcat.setBaseDir(baseDir.getAbsolutePath()); Connector connector = new Connector(this.protocol); tomcat.getService().addConnector(connector); customizeConnector(connector); tomcat.setConnector(connector); tomcat.getHost().setAutoDeploy(false); configureEngine(tomcat.getEngine()); for (Connector additionalConnector : this.additionalTomcatConnectors) { tomcat.getService().addConnector(additionalConnector); } prepareContext(tomcat.getHost(), initializers); //將配置好的Tomcat傳入進(jìn)去,返回一個(gè)EmbeddedServletContainer;并且啟動(dòng)Tomcat服務(wù)器 return getTomcatEmbeddedServletContainer(tomcat);}

4)、我們對(duì)嵌入式容器的配置修改是怎么生效?

ServerProperties、EmbeddedServletContainerCustomizer

EmbeddedServletContainerCustomizer:定制器幫我們修改了Servlet容器的配置?

怎么修改的原理?

5)、容器中導(dǎo)入了EmbeddedServletContainerCustomizerBeanPostProcessor

//初始化之前@Overridepublic Object postProcessBeforeInitialization(Object bean, String beanName) throws BeansException { //如果當(dāng)前初始化的是一個(gè)ConfigurableEmbeddedServletContainer類型的組件 if (bean instanceof ConfigurableEmbeddedServletContainer) { // postProcessBeforeInitialization((ConfigurableEmbeddedServletContainer) bean); } return bean;}private void postProcessBeforeInitialization(ConfigurableEmbeddedServletContainer bean) { //獲取所有的定制器,調(diào)用每一個(gè)定制器的customize方法來(lái)給Servlet容器進(jìn)行屬性賦值; for (EmbeddedServletContainerCustomizer customizer : getCustomizers()) { customizer.customize(bean); }}private Collection<EmbeddedServletContainerCustomizer> getCustomizers() { if (this.customizers == null) { // Look up does not include the parent context this.customizers = new ArrayList<EmbeddedServletContainerCustomizer>( this.beanFactory //從容器中獲取所有這葛類型的組件:EmbeddedServletContainerCustomizer //定制Servlet容器,給容器中可以添加一個(gè)EmbeddedServletContainerCustomizer類型的組件 .getBeansOfType(EmbeddedServletContainerCustomizer.class, false, false) .values()); Collections.sort(this.customizers, AnnotationAwareOrderComparator.INSTANCE); this.customizers = Collections.unmodifiableList(this.customizers); } return this.customizers;}ServerProperties也是定制器

步驟:

1)、SpringBoot根據(jù)導(dǎo)入的依賴情況,給容器中添加相應(yīng)的EmbeddedServletContainerFactory【TomcatEmbeddedServletContainerFactory】

2)、容器中某個(gè)組件要?jiǎng)?chuàng)建對(duì)象就會(huì)驚動(dòng)后置處理器;EmbeddedServletContainerCustomizerBeanPostProcessor;

只要是嵌入式的Servlet容器工廠,后置處理器就工作;

3)、后置處理器,從容器中獲取所有的EmbeddedServletContainerCustomizer,調(diào)用定制器的定制方法

5)、嵌入式Servlet容器啟動(dòng)原理;

什么時(shí)候創(chuàng)建嵌入式的Servlet容器工廠?什么時(shí)候獲取嵌入式的Servlet容器并啟動(dòng)Tomcat;

獲取嵌入式的Servlet容器工廠:

1)、SpringBoot應(yīng)用啟動(dòng)運(yùn)行run方法

2)、refreshContext(context);SpringBoot刷新IOC容器【創(chuàng)建IOC容器對(duì)象,并初始化容器,創(chuàng)建容器中的每一個(gè)組件】;如果是web應(yīng)用創(chuàng)建AnnotationConfigEmbeddedWebApplicationContext,否則:AnnotationConfigApplicationContext

3)、refresh(context);刷新剛才創(chuàng)建好的ioc容器;

public void refresh() throws BeansException, IllegalStateException { synchronized (this.startupShutdownMonitor) { // Prepare this context for refreshing. prepareRefresh(); // Tell the subclass to refresh the internal bean factory. ConfigurableListableBeanFactory beanFactory = obtainFreshBeanFactory(); // Prepare the bean factory for use in this context. prepareBeanFactory(beanFactory); try { // Allows post-processing of the bean factory in context subclasses. postProcessBeanFactory(beanFactory); // Invoke factory processors registered as beans in the context. invokeBeanFactoryPostProcessors(beanFactory); // Register bean processors that intercept bean creation. registerBeanPostProcessors(beanFactory); // Initialize message source for this context. initMessageSource(); // Initialize event multicaster for this context. initApplicationEventMulticaster(); // Initialize other special beans in specific context subclasses. onRefresh(); // Check for listener beans and register them. registerListeners(); // Instantiate all remaining (non-lazy-init) singletons. finishBeanFactoryInitialization(beanFactory); // Last step: publish corresponding event. finishRefresh(); } catch (BeansException ex) { if (logger.isWarnEnabled()) { logger.warn('Exception encountered during context initialization - ' + 'cancelling refresh attempt: ' + ex); } // Destroy already created singletons to avoid dangling resources. destroyBeans(); // Reset ’active’ flag. cancelRefresh(ex); // Propagate exception to caller. throw ex; } finally { // Reset common introspection caches in Spring’s core, since we // might not ever need metadata for singleton beans anymore... resetCommonCaches(); } }}

4)、 onRefresh(); web的ioc容器重寫了onRefresh方法

5)、webioc容器會(huì)創(chuàng)建嵌入式的Servlet容器;createEmbeddedServletContainer();

6)、獲取嵌入式的Servlet容器工廠:

EmbeddedServletContainerFactory containerFactory = getEmbeddedServletContainerFactory();

​從ioc容器中獲取EmbeddedServletContainerFactory 組件;TomcatEmbeddedServletContainerFactory創(chuàng)建對(duì)象,后置處理器一看是這個(gè)對(duì)象,就獲取所有的定制器來(lái)先定制Servlet容器的相關(guān)配置;

7)、使用容器工廠獲取嵌入式的Servlet容器:this.embeddedServletContainer = containerFactory .getEmbeddedServletContainer(getSelfInitializer());

8)、嵌入式的Servlet容器創(chuàng)建對(duì)象并啟動(dòng)Servlet容器;

先啟動(dòng)嵌入式的Servlet容器,再將ioc容器中剩下沒有創(chuàng)建出的對(duì)象獲取出來(lái);

IOC容器啟動(dòng)創(chuàng)建嵌入式的Servlet容器

使用外置的Servlet容器

嵌入式Servlet容器:應(yīng)用打成可執(zhí)行的jar

​優(yōu)點(diǎn):簡(jiǎn)單、便攜;

​缺點(diǎn):默認(rèn)不支持JSP、優(yōu)化定制比較復(fù)雜(使用定制器【ServerProperties、自定義EmbeddedServletContainerCustomizer】,自己編寫嵌入式Servlet容器的創(chuàng)建工廠【EmbeddedServletContainerFactory】);

外置的Servlet容器:外面安裝Tomcat---應(yīng)用war包的方式打包;

步驟

1)、必須創(chuàng)建一個(gè)war項(xiàng)目;(利用idea創(chuàng)建好目錄結(jié)構(gòu))

2)、將嵌入式的Tomcat指定為provided;

<dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-tomcat</artifactId> <scope>provided</scope></dependency>

3)、必須編寫一個(gè)SpringBootServletInitializer的子類,并調(diào)用configure方法

public class ServletInitializer extends SpringBootServletInitializer { @Override protected SpringApplicationBuilder configure(SpringApplicationBuilder application) { //傳入SpringBoot應(yīng)用的主程序 return application.sources(SpringBoot04WebJspApplication.class); }}

4)、啟動(dòng)服務(wù)器就可以使用;

原理

jar包:執(zhí)行SpringBoot主類的main方法,啟動(dòng)ioc容器,創(chuàng)建嵌入式的Servlet容器;

war包:?jiǎn)?dòng)服務(wù)器,服務(wù)器啟動(dòng)SpringBoot應(yīng)用【SpringBootServletInitializer】,啟動(dòng)ioc容器;

servlet3.0(Spring注解版):

8.2.4 Shared libraries / runtimes pluggability:

規(guī)則:

​1)、服務(wù)器啟動(dòng)(web應(yīng)用啟動(dòng))會(huì)創(chuàng)建當(dāng)前web應(yīng)用里面每一個(gè)jar包里面ServletContainerInitializer實(shí)例:

​2)、ServletContainerInitializer的實(shí)現(xiàn)放在jar包的META-INF/services文件夾下,有一個(gè)名為javax.servlet.ServletContainerInitializer的文件,內(nèi)容就是ServletContainerInitializer的實(shí)現(xiàn)類的全類名

​3)、還可以使用@HandlesTypes,在應(yīng)用啟動(dòng)的時(shí)候加載我們感興趣的類;

流程:

1)、啟動(dòng)Tomcat

2)、orgspringframeworkspring-web4.3.14.RELEASEspring-web-4.3.14.RELEASE.jar!META-INFservicesjavax.servlet.ServletContainerInitializer:

Spring的web模塊里面有這個(gè)文件:org.springframework.web.SpringServletContainerInitializer

3)、SpringServletContainerInitializer將@HandlesTypes(WebApplicationInitializer.class)標(biāo)注的所有這個(gè)類型的類都傳入到onStartup方法的Set<Class<?>>;為這些WebApplicationInitializer類型的類創(chuàng)建實(shí)例;

4)、每一個(gè)WebApplicationInitializer都調(diào)用自己的onStartup;

SpringBoot配置嵌入式Servlet容器和使用外置Servlet容器的教程圖解

5)、相當(dāng)于我們的SpringBootServletInitializer的類會(huì)被創(chuàng)建對(duì)象,并執(zhí)行onStartup方法

6)、SpringBootServletInitializer實(shí)例執(zhí)行onStartup的時(shí)候會(huì)createRootApplicationContext;創(chuàng)建容器

protected WebApplicationContext createRootApplicationContext( ServletContext servletContext) { //1、創(chuàng)建SpringApplicationBuilder SpringApplicationBuilder builder = createSpringApplicationBuilder(); StandardServletEnvironment environment = new StandardServletEnvironment(); environment.initPropertySources(servletContext, null); builder.environment(environment); builder.main(getClass()); ApplicationContext parent = getExistingRootWebApplicationContext(servletContext); if (parent != null) { this.logger.info('Root context already created (using as parent).'); servletContext.setAttribute( WebApplicationContext.ROOT_WEB_APPLICATION_CONTEXT_ATTRIBUTE, null); builder.initializers(new ParentContextApplicationContextInitializer(parent)); } builder.initializers( new ServletContextApplicationContextInitializer(servletContext)); builder.contextClass(AnnotationConfigEmbeddedWebApplicationContext.class); //調(diào)用configure方法,子類重寫了這個(gè)方法,將SpringBoot的主程序類傳入了進(jìn)來(lái) builder = configure(builder); //使用builder創(chuàng)建一個(gè)Spring應(yīng)用 SpringApplication application = builder.build(); if (application.getSources().isEmpty() && AnnotationUtils .findAnnotation(getClass(), Configuration.class) != null) { application.getSources().add(getClass()); } Assert.state(!application.getSources().isEmpty(), 'No SpringApplication sources have been defined. Either override the ' + 'configure method or add an @Configuration annotation'); // Ensure error pages are registered if (this.registerErrorPageFilter) { application.getSources().add(ErrorPageFilterConfiguration.class); } //啟動(dòng)Spring應(yīng)用 return run(application);}

7)、Spring的應(yīng)用就啟動(dòng)并且創(chuàng)建IOC容器

public ConfigurableApplicationContext run(String... args) { StopWatch stopWatch = new StopWatch(); stopWatch.start(); ConfigurableApplicationContext context = null; FailureAnalyzers analyzers = null; configureHeadlessProperty(); SpringApplicationRunListeners listeners = getRunListeners(args); listeners.starting(); try { ApplicationArguments applicationArguments = new DefaultApplicationArguments( args); ConfigurableEnvironment environment = prepareEnvironment(listeners, applicationArguments); Banner printedBanner = printBanner(environment); context = createApplicationContext(); analyzers = new FailureAnalyzers(context); prepareContext(context, environment, listeners, applicationArguments, printedBanner); //刷新IOC容器 refreshContext(context); afterRefresh(context, applicationArguments); listeners.finished(context, null); stopWatch.stop(); if (this.logStartupInfo) { new StartupInfoLogger(this.mainApplicationClass) .logStarted(getApplicationLog(), stopWatch); } return context; } catch (Throwable ex) { handleRunFailure(context, listeners, analyzers, ex); throw new IllegalStateException(ex); }}

啟動(dòng)Servlet容器,再啟動(dòng)SpringBoot應(yīng)用

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