配置Servlet 容器

SpringBoot默认使用Tomcat作为嵌入式的Servlet容器;

1、如何定制和修改Servlet容器的相关配置;

1、修改和server有关的配置(ServerProperties【也是EmbeddedServletContainerCustomizer】);

server.port=8081
server.context‐path=/crud
server.tomcat.uri‐encoding=UTF‐8
//通用的Servlet容器设置
server.xxx
//Tomcat的设置
server.tomcat.xxx

2、编写一个EmbeddedServletContainerCustomizer:嵌入式的Servlet容器的定制器;来修改Servlet容器的配置 

@Bean //一定要将这个定制器加入到容器中
public EmbeddedServletContainerCustomizer embeddedServletContainerCustomizer(){
return new EmbeddedServletContainerCustomizer() {
//定制嵌入式的Servlet容器相关的规则
@Override
public void customize(ConfigurableEmbeddedServletContainer container) {
container.setPort(8083);
    }
  };
}

2、注册Servlet三大组件【ServletFilterListener

由于SpringBoot默认是以jar包的方式启动嵌入式的Servlet容器来启动SpringBootweb应用,没有web.xml文件。 
注册三大组件用以下方式
1.ServletRegistrationBean 

//注册三大组件
@Bean
public ServletRegistrationBean myServlet(){
ServletRegistrationBean registrationBean = new ServletRegistrationBean(new
MyServlet(),"/myServlet");
return registrationBean;}

 2.FilterRegistrationBean

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

 3.ServletListenerRegistrationBean

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

 SpringBoot帮我们自动配置SpringMVC的时候,自动的注册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());
//默认拦截: / 所有请求;包静态资源,但是不拦截jsp请求; /*会拦截jsp
//可以通过server.servletPath来修改SpringMVC前端控制器默认拦截的请求路径
registration.setName(DEFAULT_DISPATCHER_SERVLET_BEAN_NAME);
registration.setLoadOnStartup(
this.webMvcProperties.getServlet().getLoadOnStartup());
if (this.multipartConfig != null) {
registration.setMultipartConfig(this.multipartConfig);
  } 
  return registration;
}

SpringBoot能不能支持其他的Servlet容器;

3、替换为其他嵌入式Servlet容器

 

默认支持:
Tomcat(默认使用)

<dependency>
<groupId>org.springframework.bootgroupId>
<artifactId>spring‐boot‐starter‐webartifactId>
引入web模块默认就是使用嵌入式的Tomcat作为Servlet容器;
dependency>

Jetty (多用于长连接的形势,比如会话服务器)

‐‐ 引入web模块 ‐‐>
<dependency>
<groupId>org.springframework.bootgroupId>
<artifactId>spring‐boot‐starter‐webartifactId>
<exclusions>
<exclusion>
<artifactId>spring‐boot‐starter‐tomcatartifactId>
<groupId>org.springframework.bootgroupId>
exclusion>
exclusions>
dependency>
‐‐引入其他的Servlet容器‐‐>
<dependency>
<artifactId>spring‐boot‐starter‐jettyartifactId>
<groupId>org.springframework.bootgroupId>
dependency>
‐‐ 引入web模块 ‐‐>
<dependency>
<groupId>org.springframework.bootgroupId>
<artifactId>spring‐boot‐starter‐webartifactId>
<exclusions>
<exclusion>
<artifactId>spring‐boot‐starter‐tomcatartifactId>
<groupId>org.springframework.bootgroupId>
exclusion>
exclusions>
dependency>

Undertow

‐‐ 引入web模块 ‐‐>
<dependency>
<groupId>org.springframework.bootgroupId>
<artifactId>spring‐boot‐starter‐webartifactId>
<exclusions>
<exclusion>
<artifactId>spring‐boot‐starter‐tomcatartifactId>
<groupId>org.springframework.bootgroupId>
exclusion>
exclusions>
dependency>
引入其他的Servlet容器‐‐>

spring‐boot‐starter‐undertow
org.springframework.boot
 

4、嵌入式Servlet容器自动配置原理;

EmbeddedServletContainerAutoConfiguration:嵌入式的Servlet容器自动配置?  

@AutoConfigureOrder(Ordered.HIGHEST_PRECEDENCE)
@Configuration
@ConditionalOnWebApplication
@Import(BeanPostProcessorsRegistrar.class)
//导入BeanPostProcessorsRegistrar:Spring注解版;给容器中导入一些组件
//导入了EmbeddedServletContainerCustomizerBeanPostProcessor:
//后置处理器:bean初始化前后(创建完对象,还没赋值赋值)执行初始化工作
public class EmbeddedServletContainerAutoConfiguration {
@Configuration
@ConditionalOnClass({ Servlet.class, Tomcat.class })//判断当前是否引入了Tomcat依赖;
@ConditionalOnMissingBean(value = EmbeddedServletContainerFactory.class, search =
SearchStrategy.CURRENT)//判断当前容器没有用户自己定义EmbeddedServletContainerFactory:嵌入式的
Servlet容器工厂;作用:创建嵌入式的Servlet容器
public static class EmbeddedTomcat {
@Bean
public 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 {
@Bean
public 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 {
@Bean
public UndertowEmbeddedServletContainerFactory
undertowEmbeddedServletContainerFactory() {
return new UndertowEmbeddedServletContainerFactory();
  }
} 

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

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

 

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

3)、以TomcatEmbeddedServletContainerFactory为例 

@Override
public EmbeddedServletContainer getEmbeddedServletContainer(
ServletContextInitializer... initializers) {
//创建一个Tomcat
Tomcat tomcat = new Tomcat();
//配置Tomcat的基本环节
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);
//将配置好的Tomcat传入进去,返回一个EmbeddedServletContainer;并且启动Tomcat服务器
return getTomcatEmbeddedServletContainer(tomcat);
}

 4)、我们对嵌入式容器的配置修改是怎么生效?

 ServerPropertiesEmbeddedServletContainerCustomizer 

EmbeddedServletContainerCustomizer:定制器帮我们修改了Servlet容器的配置? 

怎么修改的原理?
5)、容器中导入了EmbeddedServletContainerCustomizerBeanPostProcessor 

//初始化之前
@Override
public Object postProcessBeforeInitialization(Object bean, String beanName)
throws BeansException {
//如果当前初始化的是一个ConfigurableEmbeddedServletContainer类型的组件
if (bean instanceof ConfigurableEmbeddedServletContainer) {
//
postProcessBeforeInitialization((ConfigurableEmbeddedServletContainer) bean);
}
return bean;
}
private void postProcessBeforeInitialization(
ConfigurableEmbeddedServletContainer bean) {
//获取所有的定制器,调用每一个定制器的customize方法来给Servlet容器进行属性赋值;
for (EmbeddedServletContainerCustomizer customizer : getCustomizers()) {
customizer.customize(bean);
}
}
private Collection getCustomizers() {
if (this.customizers == null) {
// Look up does not include the parent context
this.customizers = new ArrayList(
this.beanFactory
//从容器中获取所有这葛类型的组件:EmbeddedServletContainerCustomizer
//定制Servlet容器,给容器中可以添加一个EmbeddedServletContainerCustomizer类型的组件
.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

步骤:

1)、SpringBoot根据导入的依赖情况,给容器中添加相应的EmbeddedServletContainerFactory【TomcatEmbeddedServletContainerFactory】

2)、容器中某个组件要创建对象就会惊动后置处理器;EmbeddedServletContainerCustomizerBeanPostProcessor;

只要是嵌入式的Servlet容器工厂,后置处理器就工作;

3)、后置处理器,从容器中获取所有的EmbeddedServletContainerCustomizer,调用定制器的定制方法

5、嵌入式Servlet容器启动原理;

什么时候创建嵌入式的Servlet容器工厂?什么时候获取嵌入式的Servlet容器并启动Tomcat;

获取嵌入式的Servlet容器工厂:

1)、SpringBoot应用启动运行run方法

2)、refreshContext(context);SpringBoot刷新IOC容器【创建IOC容器对象,并初始化容器,创建容器中的每一个组件】;如果是web应用创建AnnotationConfigEmbeddedWebApplicationContext,否则:AnnotationConfigApplicationContext

3)、refresh(context);刷新刚才创建好的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();
      }
   }
}

View Code

4)、 onRefresh(); web的ioc容器重写了onRefresh方法

5)、webioc容器会创建嵌入式的Servlet容器;createEmbeddedServletContainer();

6)、获取嵌入式的Servlet容器工厂:

EmbeddedServletContainerFactory containerFactory = getEmbeddedServletContainerFactory();

​ 从ioc容器中获取EmbeddedServletContainerFactory 组件;TomcatEmbeddedServletContainerFactory创建对象,后置处理器一看是这个对象,就获取所有的定制器来先定制Servlet容器的相关配置;

7)、使用容器工厂获取嵌入式的Servlet容器:this.embeddedServletContainer = containerFactory .getEmbeddedServletContainer(getSelfInitializer());

8)、嵌入式的Servlet容器创建对象并启动Servlet容器;

先启动嵌入式的Servlet容器,再将ioc容器中剩下没有创建出的对象获取出来;

IOC容器启动创建嵌入式的Servlet容器

6、使用外置的Servlet容器

嵌入式Servlet容器:应用打成可执行的jar

​ 优点:简单、便携;

​ 缺点:默认不支持JSP、优化定制比较复杂(使用定制器【ServerProperties、自定义EmbeddedServletContainerCustomizer】,自己编写嵌入式Servlet容器的创建工厂【EmbeddedServletContainerFactory】);

外置的Servlet容器:外面安装Tomcat—应用war包的方式打包;

步骤

1)、必须创建一个war项目;(利用idea创建好目录结构)

2)、将嵌入式的Tomcat指定为provided;

<dependency>
   <groupId>org.springframework.bootgroupId>
   <artifactId>spring-boot-starter-tomcatartifactId>
   <scope>providedscope>
dependency>

 3)、必须编写一个SpringBootServletInitializer的子类,并调用configure方法

public class ServletInitializer extends SpringBootServletInitializer {

   @Override
   protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
       //传入SpringBoot应用的主程序
      return application.sources(SpringBoot04WebJspApplication.class);
   }

}

4)、启动服务器就可以使用;

原理

jar包:执行SpringBoot主类的main方法,启动ioc容器,创建嵌入式的Servlet容器;

war包:启动服务器,服务器启动SpringBoot应用【SpringBootServletInitializer】,启动ioc容器;

 

servlet3.0(Spring注解版):

8.2.4 Shared libraries / runtimes pluggability:

规则:

​ 1)、服务器启动(web应用启动)会创建当前web应用里面每一个jar包里面ServletContainerInitializer实例:

​ 2)、ServletContainerInitializer的实现放在jar包的META-INF/services文件夹下,有一个名为javax.servlet.ServletContainerInitializer的文件,内容就是ServletContainerInitializer的实现类的全类名

​ 3)、还可以使用@HandlesTypes,在应用启动的时候加载我们感兴趣的类;

流程:

1)、启动Tomcat

2)、org\springframework\spring-web\4.3.14.RELEASE\spring-web-4.3.14.RELEASE.jar!\META-INF\services\javax.servlet.ServletContainerInitializer:

Spring的web模块里面有这个文件:org.springframework.web.SpringServletContainerInitializer

3)、SpringServletContainerInitializer将@HandlesTypes(WebApplicationInitializer.class)标注的所有这个类型的类都传入到onStartup方法的Set<class>;为这些WebApplicationInitializer类型的类创建实例;

4)、每一个WebApplicationInitializer都调用自己的onStartup;

 

5)、相当于我们的SpringBootServletInitializer的类会被创建对象,并执行onStartup方法

6)、SpringBootServletInitializer实例执行onStartup的时候会createRootApplicationContext;创建容器

protected WebApplicationContext createRootApplicationContext(
      ServletContext servletContext) {
    //1、创建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);
    
    //调用configure方法,子类重写了这个方法,将SpringBoot的主程序类传入了进来
   builder = configure(builder);
    
    //使用builder创建一个Spring应用
   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);
   }
    //启动Spring应用
   return run(application);
}

7、Spring的应用就启动并且创建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);
   }
}

 启动Servlet容器,再启动SpringBoot应用

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