spring容器启动

什么时候spring容器启动?
其实就是程序中执行加载 xml配置文件的时候

1.应用程序下加载

ApplicationContext ctx = new ClassPathXmlApplicationContext("testspring2.xml");

2.web模式下加载

web.xml:
    <context-param>
       <param-name>contextConfigLocation</param-name>
       <param-value>classpath:spring-hibernate-mysql.xml</param-value>
    </context-param>
    <listener>
          <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>

可以看日志,每次执行new ClassPathXmlApplicationContext(),都会显示下面日志:

程序执行到:
new ClassPathXmlApplicationContext("testspring2.xml");

2010-5-29 0:48:48 org.springframework.context.support.AbstractApplicationContext prepareRefresh

先刷新ApplicationContext,调用AbstractApplicationContext类的 prepareRefresh

注:
AbstractApplicationContext是 ClassPathXmlApplicationContext的父类
public abstract class AbstractApplicationContext extends DefaultResourceLoader
implements ConfigurableApplicationContext, DisposableBean {

信息: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@bf32c: display name [org.springframework.context.support.ClassPathXmlApplicationContext@bf32c]; startup date [Sat May 29 00:48:48 CST 2010]; root of context hierarchy

2010-5-29 0:48:48 org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions
信息: Loading XML bean definitions from class path resource [testspring.xml]

开始加载spring配置文件,调用xml.XmlBeanDefinitionReader类的loadBeanDefinitions方法进行加载

注意:spring 和 hibernate 常见的错误之一,经常在读取xml文件时出现语法和格式的错误,如DTD错误等.多数是使用者自己在书写xml时犯的语法错误,但也有一些是hibernate和 spring不同版本的BUG

2010-5-29 0:48:48 org.springframework.context.support.AbstractApplicationContext obtainFreshBeanFactory
信息: Bean factory for application context [org.springframework.context.support.ClassPathXmlApplicationContext@bf32c]: org.springframework.beans.factory.support.DefaultListableBeanFactory@af8358
2010-5-29 0:48:48 org.springframework.beans.factory.support.DefaultListableBeanFactory preInstantiateSingletons

获得缺省的工厂对象,spring缺省的工厂对象是
DefaultListableBeanFactory.preInstantiateSingletons

信息: Pre-instantiating singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@af8358: defining beans [personServiceBean]; root of factory hierarchy

最后为所有xml文件中定义(以及采用标注方式定义)的bean建立实例

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