Java笔记Spring（五）

C:\apache-tomcat-8.0.36\bin\catalina.bat run
[2018-05-23 02:30:31,657] Artifact demo-springmvc:war exploded: Waiting for server connection to start artifact deployment...
Using CATALINA_BASE:   "C:\Users\TQ\.IntelliJIdea2017.2\system\tomcat\Unnamed_demo-springmvc"
Using CATALINA_HOME:   "C:\apache-tomcat-8.0.36"
Using CATALINA_TMPDIR: "C:\apache-tomcat-8.0.36\temp"
Using JRE_HOME:        "C:\Program Files\Java\jdk1.8.0_25"
Using CLASSPATH:       "C:\apache-tomcat-8.0.36\bin\bootstrap.jar;C:\apache-tomcat-8.0.36\bin\tomcat-juli.jar"
23-May-2018 14:30:32.688 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Server version:        Apache Tomcat/8.0.36
23-May-2018 14:30:32.689 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Server built:          Jun 9 2016 13:55:50 UTC
23-May-2018 14:30:32.690 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Server number:         8.0.36.0
23-May-2018 14:30:32.690 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log OS Name:               Windows 8.1
23-May-2018 14:30:32.690 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log OS Version:            6.3
23-May-2018 14:30:32.690 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Architecture:          amd64
23-May-2018 14:30:32.690 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Java Home:             C:\Program Files\Java\jdk1.8.0_25\jre
23-May-2018 14:30:32.690 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log JVM Version:           1.8.0_25-b18
23-May-2018 14:30:32.690 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log JVM Vendor:            Oracle Corporation
23-May-2018 14:30:32.690 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log CATALINA_BASE:         C:\Users\TQ\.IntelliJIdea2017.2\system\tomcat\Unnamed_demo-springmvc
23-May-2018 14:30:32.690 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log CATALINA_HOME:         C:\apache-tomcat-8.0.36
23-May-2018 14:30:32.691 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Dcom.sun.management.jmxremote=
23-May-2018 14:30:32.691 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Dcom.sun.management.jmxremote.port=1099
23-May-2018 14:30:32.691 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Dcom.sun.management.jmxremote.ssl=false
23-May-2018 14:30:32.691 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Dcom.sun.management.jmxremote.authenticate=false
23-May-2018 14:30:32.692 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Djava.rmi.server.hostname=127.0.0.1
23-May-2018 14:30:32.692 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Djdk.tls.ephemeralDHKeySize=2048
23-May-2018 14:30:32.693 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Djava.util.logging.config.file=C:\Users\TQ\.IntelliJIdea2017.2\system\tomcat\Unnamed_demo-springmvc\conf\logging.properties
23-May-2018 14:30:32.693 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager
23-May-2018 14:30:32.693 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Djava.endorsed.dirs=C:\apache-tomcat-8.0.36\endorsed
23-May-2018 14:30:32.693 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Dcatalina.base=C:\Users\TQ\.IntelliJIdea2017.2\system\tomcat\Unnamed_demo-springmvc
23-May-2018 14:30:32.693 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Dcatalina.home=C:\apache-tomcat-8.0.36
23-May-2018 14:30:32.693 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Djava.io.tmpdir=C:\apache-tomcat-8.0.36\temp
23-May-2018 14:30:32.693 INFO [main] org.apache.catalina.core.AprLifecycleListener.lifecycleEvent Loaded APR based Apache Tomcat Native library 1.2.7 using APR version 1.5.2.
23-May-2018 14:30:32.693 INFO [main] org.apache.catalina.core.AprLifecycleListener.lifecycleEvent APR capabilities: IPv6 [true], sendfile [true], accept filters [false], random [true].
23-May-2018 14:30:33.477 INFO [main] org.apache.catalina.core.AprLifecycleListener.initializeSSL OpenSSL successfully initialized (OpenSSL 1.0.2h  3 May 2016)
23-May-2018 14:30:33.610 INFO [main] org.apache.coyote.AbstractProtocol.init Initializing ProtocolHandler ["http-apr-8080"]
23-May-2018 14:30:33.622 INFO [main] org.apache.coyote.AbstractProtocol.init Initializing ProtocolHandler ["ajp-apr-8009"]
23-May-2018 14:30:33.623 INFO [main] org.apache.catalina.startup.Catalina.load Initialization processed in 1325 ms
23-May-2018 14:30:33.662 INFO [main] org.apache.catalina.core.StandardService.startInternal Starting service Catalina
23-May-2018 14:30:33.662 INFO [main] org.apache.catalina.core.StandardEngine.startInternal Starting Servlet Engine: Apache Tomcat/8.0.36
23-May-2018 14:30:33.688 INFO [main] org.apache.coyote.AbstractProtocol.start Starting ProtocolHandler ["http-apr-8080"]
23-May-2018 14:30:33.709 INFO [main] org.apache.coyote.AbstractProtocol.start Starting ProtocolHandler ["ajp-apr-8009"]
23-May-2018 14:30:33.711 INFO [main] org.apache.catalina.startup.Catalina.start Server startup in 88 ms
Connected to server
[2018-05-23 02:30:33,743] Artifact demo-springmvc:war exploded: Artifact is being deployed, please wait...
23-May-2018 14:30:35.178 INFO [RMI TCP Connection(3)-127.0.0.1] org.apache.jasper.servlet.TldScanner.scanJars At least one JAR was scanned for TLDs yet contained no TLDs. Enable debug logging for this logger for a complete list of JARs that were scanned but no TLDs were found in them. Skipping unneeded JARs during scanning can improve startup time and JSP compilation time.
23-May-2018 14:30:35.246 INFO [RMI TCP Connection(3)-127.0.0.1] org.springframework.web.context.ContextLoader.initWebApplicationContext Root WebApplicationContext: initialization started
23-May-2018 14:30:35.336 INFO [RMI TCP Connection(3)-127.0.0.1] org.springframework.web.context.support.XmlWebApplicationContext.prepareRefresh Refreshing Root WebApplicationContext: startup date [Wed May 23 14:30:35 CST 2018]; root of context hierarchy
23-May-2018 14:30:35.425 INFO [RMI TCP Connection(3)-127.0.0.1] org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions Loading XML bean definitions from ServletContext resource [/WEB-INF/applicationContext.xml]
23-May-2018 14:30:35.589 INFO [RMI TCP Connection(3)-127.0.0.1] org.springframework.web.context.ContextLoader.initWebApplicationContext Root WebApplicationContext: initialization completed in 343 ms
23-May-2018 14:30:35.723 INFO [RMI TCP Connection(3)-127.0.0.1] org.springframework.web.servlet.DispatcherServlet.initServletBean FrameworkServlet 'dispatcher': initialization started
23-May-2018 14:30:35.729 INFO [RMI TCP Connection(3)-127.0.0.1] org.springframework.web.context.support.XmlWebApplicationContext.prepareRefresh Refreshing WebApplicationContext for namespace 'dispatcher-servlet': startup date [Wed May 23 14:30:35 CST 2018]; parent: Root WebApplicationContext
23-May-2018 14:30:35.730 INFO [RMI TCP Connection(3)-127.0.0.1] org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions Loading XML bean definitions from ServletContext resource [/WEB-INF/dispatcher-servlet2.xml]
23-May-2018 14:30:36.548 INFO [RMI TCP Connection(3)-127.0.0.1] org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping.register Mapped "{[/user/get],methods=[GET],produces=[text/plain;charset=utf-8]}" onto public java.lang.String com.example.demo.controller.UserController.get(javax.servlet.http.HttpServletRequest,javax.servlet.http.HttpServletResponse)
23-May-2018 14:30:36.664 INFO [RMI TCP Connection(3)-127.0.0.1] org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.initControllerAdviceCache Looking for @ControllerAdvice: WebApplicationContext for namespace 'dispatcher-servlet': startup date [Wed May 23 14:30:35 CST 2018]; parent: Root WebApplicationContext
23-May-2018 14:30:36.735 INFO [RMI TCP Connection(3)-127.0.0.1] org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.initControllerAdviceCache Looking for @ControllerAdvice: WebApplicationContext for namespace 'dispatcher-servlet': startup date [Wed May 23 14:30:35 CST 2018]; parent: Root WebApplicationContext
23-May-2018 14:30:36.947 INFO [RMI TCP Connection(3)-127.0.0.1] org.springframework.web.servlet.DispatcherServlet.initServletBean FrameworkServlet 'dispatcher': initialization completed in 1224 ms
[2018-05-23 02:30:36,975] Artifact demo-springmvc:war exploded: Artifact is deployed successfully
[2018-05-23 02:30:36,975] Artifact demo-springmvc:war exploded: Deploy took 3,232 milliseconds

截取spring部分日志

 23-May-2018 14:30:35.178 INFO [RMI TCP Connection(3)-127.0.0.1] org.apache.jasper.servlet.TldScanner.scanJars At least one JAR was scanned for TLDs yet contained no TLDs. Enable debug logging for this logger for a complete list of JARs that were scanned but no TLDs were found in them. Skipping unneeded JARs during scanning can improve startup time and JSP compilation time.
 23-May-2018 14:30:35.246 INFO [RMI TCP Connection(3)-127.0.0.1] org.springframework.web.context.ContextLoader.initWebApplicationContext Root WebApplicationContext: initialization started
 23-May-2018 14:30:35.336 INFO [RMI TCP Connection(3)-127.0.0.1] org.springframework.web.context.support.XmlWebApplicationContext.prepareRefresh Refreshing Root WebApplicationContext: startup date [Wed May 23 14:30:35 CST 2018]; root of context hierarchy
 23-May-2018 14:30:35.425 INFO [RMI TCP Connection(3)-127.0.0.1] org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions Loading XML bean definitions from ServletContext resource [/WEB-INF/applicationContext.xml]
 23-May-2018 14:30:35.589 INFO [RMI TCP Connection(3)-127.0.0.1] org.springframework.web.context.ContextLoader.initWebApplicationContext Root WebApplicationContext: initialization completed in 343 ms
 23-May-2018 14:30:35.723 INFO [RMI TCP Connection(3)-127.0.0.1] org.springframework.web.servlet.DispatcherServlet.initServletBean FrameworkServlet 'dispatcher': initialization started
 23-May-2018 14:30:35.729 INFO [RMI TCP Connection(3)-127.0.0.1] org.springframework.web.context.support.XmlWebApplicationContext.prepareRefresh Refreshing WebApplicationContext for namespace 'dispatcher-servlet': startup date [Wed May 23 14:30:35 CST 2018]; parent: Root WebApplicationContext
 23-May-2018 14:30:35.730 INFO [RMI TCP Connection(3)-127.0.0.1] org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions Loading XML bean definitions from ServletContext resource [/WEB-INF/dispatcher-servlet2.xml]
 23-May-2018 14:30:36.548 INFO [RMI TCP Connection(3)-127.0.0.1] org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping.register Mapped "{[/user/get],methods=[GET],produces=[text/plain;charset=utf-8]}" onto public java.lang.String com.example.demo.controller.UserController.get(javax.servlet.http.HttpServletRequest,javax.servlet.http.HttpServletResponse)
 23-May-2018 14:30:36.664 INFO [RMI TCP Connection(3)-127.0.0.1] org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.initControllerAdviceCache Looking for @ControllerAdvice: WebApplicationContext for namespace 'dispatcher-servlet': startup date [Wed May 23 14:30:35 CST 2018]; parent: Root WebApplicationContext
 23-May-2018 14:30:36.735 INFO [RMI TCP Connection(3)-127.0.0.1] org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.initControllerAdviceCache Looking for @ControllerAdvice: WebApplicationContext for namespace 'dispatcher-servlet': startup date [Wed May 23 14:30:35 CST 2018]; parent: Root WebApplicationContext
 23-May-2018 14:30:36.947 INFO [RMI TCP Connection(3)-127.0.0.1] org.springframework.web.servlet.DispatcherServlet.initServletBean FrameworkServlet 'dispatcher': initialization completed in 1224 ms

从第2行开始到第12行为spring启动阶段log打出的所有info日志

定位其源码位置

public WebApplicationContext initWebApplicationContext(ServletContext servletContext) {
    if (servletContext.getAttribute(WebApplicationContext.ROOT_WEB_APPLICATION_CONTEXT_ATTRIBUTE) != null) {
        throw new IllegalStateException(
                "Cannot initialize context because there is already a root application context present - " +
                "check whether you have multiple ContextLoader* definitions in your web.xml!");
    }

    Log logger = LogFactory.getLog(ContextLoader.class);
    servletContext.log("Initializing Spring root WebApplicationContext");
    if (logger.isInfoEnabled()) {
        logger.info("Root WebApplicationContext: initialization started");// 日志第2行
    }
    long startTime = System.currentTimeMillis();

    try {
        // Store context in local instance variable, to guarantee that
        // it is available on ServletContext shutdown.
        if (this.context == null) {
            this.context = createWebApplicationContext(servletContext);
        }
        if (this.context instanceof ConfigurableWebApplicationContext) {
            ConfigurableWebApplicationContext cwac = (ConfigurableWebApplicationContext) this.context;
            if (!cwac.isActive()) {
                // The context has not yet been refreshed -> provide services such as
                // setting the parent context, setting the application context id, etc
                if (cwac.getParent() == null) {
                    // The context instance was injected without an explicit parent ->
                    // determine parent for root web application context, if any.
                    ApplicationContext parent = loadParentContext(servletContext);
                    cwac.setParent(parent);
                }
                configureAndRefreshWebApplicationContext(cwac, servletContext);
            }
        }
        servletContext.setAttribute(WebApplicationContext.ROOT_WEB_APPLICATION_CONTEXT_ATTRIBUTE, this.context);

        ClassLoader ccl = Thread.currentThread().getContextClassLoader();
        if (ccl == ContextLoader.class.getClassLoader()) {
            currentContext = this.context;
        }
        else if (ccl != null) {
            currentContextPerThread.put(ccl, this.context);
        }

        if (logger.isDebugEnabled()) {
            logger.debug("Published root WebApplicationContext as ServletContext attribute with name [" +
                    WebApplicationContext.ROOT_WEB_APPLICATION_CONTEXT_ATTRIBUTE + "]");
        }
        if (logger.isInfoEnabled()) {
            long elapsedTime = System.currentTimeMillis() - startTime;
            logger.info("Root WebApplicationContext: initialization completed in " + elapsedTime + " ms");// 日志第5行
        }

        return this.context;
    }
    catch (RuntimeException ex) {
        logger.error("Context initialization failed", ex);
        servletContext.setAttribute(WebApplicationContext.ROOT_WEB_APPLICATION_CONTEXT_ATTRIBUTE, ex);
        throw ex;
    }
    catch (Error err) {
        logger.error("Context initialization failed", err);
        servletContext.setAttribute(WebApplicationContext.ROOT_WEB_APPLICATION_CONTEXT_ATTRIBUTE, err);
        throw err;
    }
}

protected void configureAndRefreshWebApplicationContext(ConfigurableWebApplicationContext wac, ServletContext sc) {
   if (ObjectUtils.identityToString(wac).equals(wac.getId())) {
      // The application context id is still set to its original default value
      // -> assign a more useful id based on available information
      String idParam = sc.getInitParameter(CONTEXT_ID_PARAM);
      if (idParam != null) {
         wac.setId(idParam);
      }
      else {
         // Generate default id...
         wac.setId(ConfigurableWebApplicationContext.APPLICATION_CONTEXT_ID_PREFIX +
               ObjectUtils.getDisplayString(sc.getContextPath()));
      }
   }

   wac.setServletContext(sc);
   String configLocationParam = sc.getInitParameter(CONFIG_LOCATION_PARAM);
   if (configLocationParam != null) {
      wac.setConfigLocation(configLocationParam);
   }

   // The wac environment's #initPropertySources will be called in any case when the context
   // is refreshed; do it eagerly here to ensure servlet property sources are in place for
   // use in any post-processing or initialization that occurs below prior to #refresh
   ConfigurableEnvironment env = wac.getEnvironment();
   if (env instanceof ConfigurableWebEnvironment) {
      ((ConfigurableWebEnvironment) env).initPropertySources(sc, null);
   }

   customizeContext(sc, wac);
   wac.refresh();
}

@Override
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();
        }
    }
}

/**
 * Prepare this context for refreshing, setting its startup date and
 * active flag as well as performing any initialization of property sources.
 */
protected void prepareRefresh() {
    this.startupDate = System.currentTimeMillis();
    this.closed.set(false);
    this.active.set(true);

    if (logger.isInfoEnabled()) {
        logger.info("Refreshing " + this);// 日志第3行
    }

    // Initialize any placeholder property sources in the context environment
    initPropertySources();

    // Validate that all properties marked as required are resolvable
    // see ConfigurablePropertyResolver#setRequiredProperties
    getEnvironment().validateRequiredProperties();

    // Allow for the collection of early ApplicationEvents,
    // to be published once the multicaster is available...
    this.earlyApplicationEvents = new LinkedHashSet<ApplicationEvent>();
}

/**
 * Load bean definitions from the specified XML file.
 * @param encodedResource the resource descriptor for the XML file,
 * allowing to specify an encoding to use for parsing the file
 * @return the number of bean definitions found
 * @throws BeanDefinitionStoreException in case of loading or parsing errors
 */
public int loadBeanDefinitions(EncodedResource encodedResource) throws BeanDefinitionStoreException {
    Assert.notNull(encodedResource, "EncodedResource must not be null");
    if (logger.isInfoEnabled()) {
        logger.info("Loading XML bean definitions from " + encodedResource.getResource());// 日志第4行
    }

    Set<EncodedResource> currentResources = this.resourcesCurrentlyBeingLoaded.get();
    if (currentResources == null) {
        currentResources = new HashSet<EncodedResource>(4);
        this.resourcesCurrentlyBeingLoaded.set(currentResources);
    }
    if (!currentResources.add(encodedResource)) {
        throw new BeanDefinitionStoreException(
                "Detected cyclic loading of " + encodedResource + " - check your import definitions!");
    }
    try {
        InputStream inputStream = encodedResource.getResource().getInputStream();
        try {
            InputSource inputSource = new InputSource(inputStream);
            if (encodedResource.getEncoding() != null) {
                inputSource.setEncoding(encodedResource.getEncoding());
            }
            return doLoadBeanDefinitions(inputSource, encodedResource.getResource());
        }
        finally {
            inputStream.close();
        }
    }
    catch (IOException ex) {
        throw new BeanDefinitionStoreException(
                "IOException parsing XML document from " + encodedResource.getResource(), ex);
    }
    finally {
        currentResources.remove(encodedResource);
        if (currentResources.isEmpty()) {
            this.resourcesCurrentlyBeingLoaded.remove();
        }
    }
}

从日志反分析spring web的启动过程

之后是loadBean

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