java spring 03 启动细节-编程知识

java spring 03 启动细节

spring启动类ClassPathXmlApplicationContext，读取xml文件并且创建bean

public ClassPathXmlApplicationContext(String[] configLocations, boolean refresh, @Nullable ApplicationContext parent)throws BeansException {super(parent);setConfigLocations(configLocations);if (refresh) {refresh();}}

第一步.
01.其中的父类构造方法：

super(parent);

02
ClassPathXmlApplicationContext 继承 AbstractXmlApplicationContext：

public class ClassPathXmlApplicationContext extends AbstractXmlApplicationContext

AbstractXmlApplicationContext的构造方法：

	public AbstractXmlApplicationContext(@Nullable ApplicationContext parent) {super(parent);}

03.AbstractXmlApplicationContext 继承 AbstractRefreshableConfigApplicationContext

AbstractRefreshableConfigApplicationContext的构造方法：

public AbstractRefreshableConfigApplicationContext(@Nullable ApplicationContext parent) {super(parent);}

04.AbstractRefreshableConfigApplicationContext 继承 AbstractRefreshableApplicationContext

AbstractRefreshableApplicationContext的构造方法：

	public AbstractRefreshableApplicationContext(@Nullable ApplicationContext parent) {super(parent);}

05.AbstractRefreshableApplicationContext 继承 AbstractApplicationContext

AbstractApplicationContext的构造方法：

public AbstractApplicationContext(@Nullable ApplicationContext parent) {this();setParent(parent);}public AbstractApplicationContext() {this.resourcePatternResolver = getResourcePatternResolver();}

getResourcePatternResolver（）解析资源的函数，比如xml文件

protected ResourcePatternResolver getResourcePatternResolver() {return new PathMatchingResourcePatternResolver(this);}

06.AbstractApplicationContext的相关属性

   /** Logger used by this class. Available to subclasses. *///日志protected final Log logger = LogFactory.getLog(getClass());/** Unique id for this context, if any. *///唯一标识符private String id = ObjectUtils.identityToString(this);/** Display name. */private String displayName = ObjectUtils.identityToString(this);/** Parent context. */@Nullableprivate ApplicationContext parent;/** Environment used by this context. */@Nullableprivate ConfigurableEnvironment environment;/** BeanFactoryPostProcessors to apply on refresh. *///BeanFactoryPostProcessor的集合private final List<BeanFactoryPostProcessor> beanFactoryPostProcessors = new ArrayList<>();/** System time in milliseconds when this context started. */private long startupDate;/** Flag that indicates whether this context is currently active. */private final AtomicBoolean active = new AtomicBoolean();/** Flag that indicates whether this context has been closed already. */private final AtomicBoolean closed = new AtomicBoolean();/** Synchronization monitor for the "refresh" and "destroy". */private final Object startupShutdownMonitor = new Object();@Nullableprivate Thread shutdownHook;/** ResourcePatternResolver used by this context. */private final ResourcePatternResolver resourcePatternResolver;/** LifecycleProcessor for managing the lifecycle of beans within this context. */@Nullableprivate LifecycleProcessor lifecycleProcessor;/** MessageSource we delegate our implementation of this interface to. */@Nullableprivate MessageSource messageSource;