Spring中MVC框架的底层实现
Spring中的MVC
Spring MVC的流程
Spring的Sample这里就不讲了，大家自己上网google
Spring 在Web环境下的启动
按照JavaEE标准，Web应用启动web.xml，之后的启动root是ServletContextListener。
(问题： ContextListener如何启动？ 随着web容器启动而启动？是单线程的？线程安全的？)
ContextListener是随着Tomcat的启动而启动，并且只启动这一次，为整个WebContext的启动做准备。
Spring在Web环境下启动的监听器是：
- public class ContextLoaderListener extends ContextLoader implements ServletContextListener {
- /**
- * Initialize the root web application context.
- */
- public void contextInitialized(ServletContextEvent event) {
- this.contextLoader = createContextLoader();
- if (this.contextLoader == null) {
- this.contextLoader = this;
- }
- this.contextLoader.initWebApplicationContext(event.getServletContext());
- }
其中WebApplication的上下文在ContextLoader中初期化
- /**
- * Initialize Spring's web application context for the given servlet context,
- * using the application context provided at construction time, or creating a new one
- * according to the "{@link #CONTEXT_CLASS_PARAM contextClass}" and
- * "{@link #CONFIG_LOCATION_PARAM contextConfigLocation}" context-params.
- * @param servletContext current servlet context
- * @return the new WebApplicationContext
- * @see #ContextLoader(WebApplicationContext)
- * @see #CONTEXT_CLASS_PARAM
- * @see #CONFIG_LOCATION_PARAM
- */
- public WebApplicationContext initWebApplicationContext(ServletContext servletContext) {
- try {
- // Store context in local instance variable, to guarantee that
- // it is available on ServletContext shutdown.
- if (this.context == null) {
- this.context = createWebApplicationContext(servletContext);
- }
最后的启动委托给XmlWebApplicationContext
这个类中使用了大量的模板设计模式！！
最终的容器启动和我们编程式启动Spring类同
- /**
- * Loads the bean definitions via an XmlBeanDefinitionReader.
- * @see org.springframework.beans.factory.xml.XmlBeanDefinitionReader
- * @see #initBeanDefinitionReader
- * @see #loadBeanDefinitions
- */
- @Override
- protected void loadBeanDefinitions(DefaultListableBeanFactory beanFactory) throws BeansException, IOException {
- // Create a new XmlBeanDefinitionReader for the given BeanFactory.
- XmlBeanDefinitionReader beanDefinitionReader = new XmlBeanDefinitionReader(beanFactory);
- // Configure the bean definition reader with this context's
- // resource loading environment.
- beanDefinitionReader.setEnvironment(this.getEnvironment());
- beanDefinitionReader.setResourceLoader(this);
- beanDefinitionReader.setEntityResolver(new ResourceEntityResolver(this));
- // Allow a subclass to provide custom initialization of the reader,
- // then proceed with actually loading the bean definitions.
- initBeanDefinitionReader(beanDefinitionReader);
- loadBeanDefinitions(beanDefinitionReader);
- }
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