Springboot-源码之装配tomcat

Ctrl+N 搜索 AbstractApplicationContext 里面的onRefresh()方法

protected void onRefresh() throws BeansException {
    }

然后找到实现类ServletWebServerApplicationContext

protected void onRefresh() {
        super.onRefresh();

        try {
//
            this.createWebServer();
        } catch (Throwable var2) {
            throw new ApplicationContextException("Unable to start web server", var2);
        }
    }

private void createWebServer() {
        WebServer webServer = this.webServer;
        ServletContext servletContext = this.getServletContext();
        if(webServer == null && servletContext == null) {
//
            ServletWebServerFactory ex = this.getWebServerFactory();
//工厂获取webServer的
            this.webServer = ex.getWebServer(new ServletContextInitializer[]{this.getSelfInitializer()});
        } else if(servletContext != null) {
            try {
                this.getSelfInitializer().onStartup(servletContext);
            } catch (ServletException var4) {
                throw new ApplicationContextException("Cannot initialize servlet context", var4);
            }
        }

        this.initPropertySources();
    }

我们再进入到getWebServer这个方法内部

public WebServer getWebServer(ServletContextInitializer... initializers) {
//创建一个tomcat对象
        Tomcat tomcat = new Tomcat();
        File baseDir = this.baseDirectory != null?this.baseDirectory:this.createTempDir("tomcat");
//设置baseDir
        tomcat.setBaseDir(baseDir.getAbsolutePath());
//创建tomcat的连接器
        Connector connector = new Connector(this.protocol);
//把连接器设置到tomcat中去
        tomcat.getService().addConnector(connector);
        this.customizeConnector(connector);
        tomcat.setConnector(connector);
//设置为是否自动启动
        tomcat.getHost().setAutoDeploy(false);
//创建tomcat引擎
        this.configureEngine(tomcat.getEngine());
        Iterator var5 = this.additionalTomcatConnectors.iterator();

        while(var5.hasNext()) {
            Connector additionalConnector = (Connector)var5.next();
            tomcat.getService().addConnector(additionalConnector);
        }
//刷新tomcat的上下文
        this.prepareContext(tomcat.getHost(), initializers);
//准备启动(还未启动)
        return this.getTomcatWebServer(tomcat);
    }

然后进入准备启动的getTomcatWebServer()这个方法

protected TomcatWebServer getTomcatWebServer(Tomcat tomcat) {
        return new TomcatWebServer(tomcat, this.getPort() >= 0);
    }

这个autoStart是什么意思？端口号>0自动启动

public TomcatWebServer(Tomcat tomcat, boolean autoStart) {
        this.monitor = new Object();
        this.serviceConnectors = new HashMap();
        Assert.notNull(tomcat, "Tomcat Server must not be null");
        this.tomcat = tomcat;
        this.autoStart = autoStart;
        //tomcat启动
        this.initialize();
    }

private void initialize() throws WebServerException {
        logger.info("Tomcat initialized with port(s): " + this.getPortsDescription(false));
        Object var1 = this.monitor;
        synchronized(this.monitor) {
            try {
                this.addInstanceIdToEngineName();
                //找到tomcat上下文
                Context ex = this.findContext();
                ex.addLifecycleListener((event) -> {
                    if(ex.equals(event.getSource()) && "start".equals(event.getType())) {
                        this.removeServiceConnectors();
                    }

                });
                //启动tomcat
                this.tomcat.start();
                this.rethrowDeferredStartupExceptions();

                try {
                    ContextBindings.bindClassLoader(ex, ex.getNamingToken(), this.getClass().getClassLoader());
                } catch (NamingException var5) {
                    ;
                }
                //
                this.startDaemonAwaitThread();
            } catch (Exception var6) {
                this.stopSilently();
                throw new WebServerException("Unable to start embedded Tomcat", var6);
            }

        }
    }

来源：oschina

链接：https://my.oschina.net/architectliuyuanyuan/blog/3188056

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Spring

Spring Boot

autostart