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SpringBoot集成Tomcat服务架构配置

知了一笑 人气:0

一、Tomcat集成

使用的成本越低,内部封装越复杂;

1、依赖层级

在SpringBoot框架的web依赖包中,引入的是内嵌Tomcat组件,基于SpringBoot的版本,Tomcat集成的是9.0版本;

<!-- 1、项目工程依赖 -->
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
    <version>2.2.5.RELEASE</version>
</dependency>
<!-- 2、starter-web依赖 -->
<dependency>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-starter-tomcat</artifactId>
  <version>2.2.5.RELEASE</version>
  <scope>compile</scope>
</dependency>
<!-- 3、starter-tomcat依赖 -->
<dependency>
  <groupId>org.apache.tomcat.embed</groupId>
  <artifactId>tomcat-embed-core</artifactId>
  <version>9.0.31</version>
  <scope>compile</scope>
</dependency>

2、自动化配置

在SpringBoot框架的自动配置类中,Web项目中不显式更换其他服务依赖时,默认提供了对Tomcat服务的管理;

@ConditionalOnWebApplication(type = Type.SERVLET)
@EnableConfigurationProperties(ServerProperties.class)
@Import({ ServletWebServerFactoryAutoConfiguration.BeanPostProcessorsRegistrar.class,
		ServletWebServerFactoryConfiguration.EmbeddedTomcat.class})
public class ServletWebServerFactoryAutoConfiguration {
	@Bean
	@ConditionalOnClass(name = "org.apache.catalina.startup.Tomcat")
	public TomcatServletWebServerFactoryCustomizer tomcatServletWebServerFactoryCustomizer(
			ServerProperties serverProperties) {
		return new TomcatServletWebServerFactoryCustomizer(serverProperties);
	}
}

二、Tomcat架构

Server:代表整个Tomcat容器;

Service:服务器内部的中间组件,将一个或多个Connector绑定到一个Engine上;

Engine:表示特定服务的请求处理管道,接收Connector的请求并响应;

Host:网络主机名称;

Connector:连接器处理与客户端的通信;

Context:代表一个Web应用程序的上下文;

参考Tomcat9.0版本的核心组件描述,对于框架有大致的了解后,再去分析集成原理,会更容易把握主线逻辑;

三、Tomcat配置

1、基础配置

在配置文件中,对Tomcat做一些基础性的设置,查看下面的配置类可以知道,这些属性存在默认值;

server:
  port: 8082                # 端口号
  tomcat:                   # Tomcat组件
    uri-encoding: UTF-8     # URI编码
    max-threads: 100        # 最大工作线程
    min-spare-threads: 10   # 最小工作线程

2、属性配置类

在服务配置中,提供多种服务器的适配,像Tomcat、Jetty、Netty、Undertow,从策略上看,配置分为公共属性以及各种服务器的适配属性;

更多配置信息,可以参考完整的源码和注释说明;

@ConfigurationProperties(prefix = "server", ignoreUnknownFields = true)
public class ServerProperties {
    private Integer port;
    public static class Tomcat {
        private Charset uriEncoding = StandardCharsets.UTF_8;
        private int maxThreads = 200;
        private int minSpareThreads = 10;
    }
}

3、配置加载分析

public class TomcatWebServerFactoryCustomizer
        implements WebServerFactoryCustomizer&lt;ConfigurableTomcatWebServerFactory&gt; {
    @Override
    public void customize(ConfigurableTomcatWebServerFactory factory) {
        ServerProperties properties = this.serverProperties;
        ServerProperties.Tomcat tomcatProperties = properties.getTomcat();
        PropertyMapper propertyMapper = PropertyMapper.get();
        customizeStaticResources(factory);
    }
}
public class TomcatServletWebServerFactory extends AbstractServletWebServerFactory
        implements ConfigurableTomcatWebServerFactory, ResourceLoaderAware {
    @Override
    public WebServer getWebServer(ServletContextInitializer... initializers) {
        Tomcat tomcat = new Tomcat();
        Connector connector = new Connector(this.protocol);
        connector.setThrowOnFailure(true);
        tomcat.getService().addConnector(connector);
        customizeConnector(connector);
        tomcat.setConnector(connector);
        tomcat.getHost().setAutoDeploy(false);
        configureEngine(tomcat.getEngine());
        prepareContext(tomcat.getHost(), initializers);
        return getTomcatWebServer(tomcat);
    }
}

四、周期管理方法

1、控制类

public interface WebServer {
	// 获取监听的端口
	int getPort();
	// 服务启动
	void start() throws WebServerException;
	// 服务停止
	void stop() throws WebServerException;
}
public class TomcatWebServer implements WebServer {
    private final Tomcat tomcat;
    private final Map&lt;Service, Connector[]&gt; serviceConnectors = new HashMap&lt;&gt;();
}
public class Tomcat {
    protected Server server;
    protected int port = 8080;
    protected String hostname = "localhost";
    // 初始化服务
    public void init() throws LifecycleException {
        getServer();
        server.init();
    }
    // 启动服务
    public void start() throws LifecycleException {
        getServer();
        server.start();
    }
    // 停止服务
    public void stop() throws LifecycleException {
        getServer();
        server.stop();
    }
}

2、核心方法

2.1 初始化,初始化时,调用Apache-Tomcat类中启动方法;

public class TomcatWebServer implements WebServer {
    /**
     * 初始化方法
     */
    private void initialize() throws WebServerException {
        // 控制台日志
        logger.info("Tomcat initialized with port(s): " + getPortsDescription(false));
        synchronized (this.monitor) {
            // 调用Apache-Tomcat类中启动方法
            this.tomcat.start();
        }
    }
}

2.2 启动,在初始化的方法中,调用的Tomcat启动方法,这里对状态进行校验并输出日志;

public class TomcatWebServer implements WebServer {
    /**
     * 启动方法
     */
    public void start() throws WebServerException {
        synchronized (this.monitor) {
            if (this.started) {
                return;
            }
            checkThatConnectorsHaveStarted();
            // 启动状态的标识
            this.started = true;
            // 控制台日志
            logger.info("Tomcat started on port(s): " + getPortsDescription(true) + " with context path '"
                    + getContextPath() + "'");
        }
    }
}

2.3 停止,在组件生命周期的常规管理逻辑中,停止服务之后进行销毁动作的执行,其中自然涉及到多个状态标识的转换;

public class TomcatWebServer implements WebServer {
    /**
     * 停止方法
     */
    public void stop() throws WebServerException {
        synchronized (this.monitor) {
            // 状态变化
            boolean wasStarted = this.started;
            this.started = false;
            // Tomcat服务停止
            stopTomcat();
            this.tomcat.destroy();
        }
    }
}

参考源码

编程文档:

https://gitee.com/cicadasmile/butte-java-note

应用仓库:

https://gitee.com/cicadasmile/butte-flyer-parent

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