Application初始化日志
15:23:12.790 [main] DEBUG o.s.core.env.StandardEnvironment - Adding [systemProperties] PropertySource with lowest search precedence 15:23:12.797 [main] DEBUG o.s.core.env.StandardEnvironment - Adding [systemEnvironment] PropertySource with lowest search precedence 15:23:12.797 [main] DEBUG o.s.core.env.StandardEnvironment - Initialized StandardEnvironment with PropertySources [systemProperties,systemEnvironment] //初始化Environment 15:23:12.803 [main] INFO o.s.c.s.ClassPathXmlApplicationContext - Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@480a6370: startup date [Mon Aug 25 15:23:12 CST 2014]; root of context hierarchy 15:23:12.861 [main] DEBUG o.s.core.env.StandardEnvironment - Adding [systemProperties] PropertySource with lowest search precedence 15:23:12.862 [main] DEBUG o.s.core.env.StandardEnvironment - Adding [systemEnvironment] PropertySource with lowest search precedence 15:23:12.862 [main] DEBUG o.s.core.env.StandardEnvironment - Initialized StandardEnvironment with PropertySources [systemProperties,systemEnvironment] //读取XML 15:23:12.880 [main] INFO o.s.b.f.xml.XmlBeanDefinitionReader - Loading XML bean definitions from class path resource [simpleContext.xml] 15:23:12.885 [main] DEBUG o.s.b.f.xml.DefaultDocumentLoader - Using JAXP provider [com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderFactoryImpl] 15:23:12.928 [main] DEBUG o.s.b.factory.xml.BeansDtdResolver - Found beans DTD [http://www.springframework.org/dtd/spring-beans-2.0.dtd] in classpath: spring-beans-2.0.dtd //读取BeanDefinition 15:23:12.953 [main] DEBUG o.s.b.f.x.DefaultBeanDefinitionDocumentReader - Loading bean definitions //解析XML 15:23:12.971 [main] DEBUG o.s.b.f.x.BeanDefinitionParserDelegate - No XML 'id' specified - using 'simpleBean' as bean name and [] as aliases 15:23:12.986 [main] DEBUG o.s.b.f.x.BeanDefinitionParserDelegate - No XML 'id' specified - using 'anotherBean' as bean name and [] as aliases 15:23:12.986 [main] DEBUG o.s.b.f.xml.XmlBeanDefinitionReader - Loaded 3 bean definitions from location pattern [simpleContext.xml] //将获取到的BeanDefined设置到BeanFactory中 15:23:12.987 [main] DEBUG o.s.c.s.ClassPathXmlApplicationContext - Bean factory for org.springframework.context.support.ClassPathXmlApplicationContext@480a6370: org.springframework.beans.factory.support.DefaultListableBeanFactory@74bdaaa: defining beans [simpleBean,property,anotherBean]; root of factory hierarchy //初始化MessageSource，I18N中使用 15:23:13.025 [main] DEBUG o.s.c.s.ClassPathXmlApplicationContext - Unable to locate MessageSource with name 'messageSource': using default [org.springframework.context.support.DelegatingMessageSource@6f526c5f] //application事件中心 15:23:13.029 [main] DEBUG o.s.c.s.ClassPathXmlApplicationContext - Unable to locate ApplicationEventMulticaster with name 'applicationEventMulticaster': using default [org.springframework.context.event.SimpleApplicationEventMulticaster@5629fbc9]
一些bean的初始化
一个简单的bean，里面有个属性property,以及test方法和需要进行属性注入的setProperty
/**
* 基本的bean方便测试
* Created by zhangya on 2014/8/13.
*/
public class SimpleBean
{
private static final Logger LOGGER = LoggerFactory.getLogger(SimpleBean.class);
private SimpleBeanProperty property;
/**
* 简单测试方法
*/
public void test()
{
LOGGER.info("SimpleBean is loading.");
property.propertyTest();
}
/**
* 设置属性 property
* <p>记录日志
* @param property
*/
public void setProperty(SimpleBeanProperty property)
{
LOGGER.info("Property is setting.");
this.property = property;
}
}
作为属性赋值的bean，里面包含初始化方法
/**
* 作为属性初始化的bean
* Created by zhangya on 2014/8/13.
*/
public class SimpleBeanProperty
{
private static final Logger LOGGER = LoggerFactory.getLogger(SimpleBeanProperty.class);
private String simpleVariable = "test567";
public SimpleBeanProperty()
{
LOGGER.info("SimpleBeanProperty is loading.");
}
/**
* property的test方法
*/
public void propertyTest()
{
LOGGER.info("propertyTest method is invoking.{}",this);
}
/**
* 设置变量
* @param simpleVariable
*/
public void setSimpleVariable(String simpleVariable)
{
this.simpleVariable = simpleVariable;
}
/**
* 获取变量的值
* @return 变量的值
*/
public String getSimpleVariable()
{
return simpleVariable;
}
@Override
public String toString()
{
return "SimpleBeanProperty{" +
"simpleVariable='" + simpleVariable + '\'' +
'}';
}
}
另外一个
/**
* 用于初始化的另外一个bean
* @author zhangya
* @category com.letume.spring.study.init
* @since 2014/8/24
*/
public class SimpleAnotherBean
{
private static final Logger LOGGER = LoggerFactory.getLogger(SimpleBeanProperty.class);
private String simpleVariable = "test123";
public SimpleAnotherBean()
{
LOGGER.info("SimpleAnotherBean is loading.");
}
/**
* property的test方法
*/
public void test()
{
LOGGER.info("test method is invoking.{}",this);
}
/**
* 设置变量
* @param simpleVariable
*/
public void setSimpleVariable(String simpleVariable)
{
this.simpleVariable = simpleVariable;
}
@Override
public String toString()
{
return "SimpleAnotherBean{" +
"simpleVariable='" + simpleVariable + '\'' +
'}';
}
}
simpleContext.xml applicationContext的配置文件，这里使用xml形式对bean进行配置
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN 2.0//EN"
"http://www.springframework.org/dtd/spring-beans-2.0.dtd">
<beans>
<bean name="simpleBean"
class="com.letume.spring.study.init.SimpleBean">
<property name="property"><ref local="property"/> </property>
</bean>
<bean id="property" name="property"
class="com.letume.spring.study.init.SimpleBeanProperty" scope="prototype"/>
<bean name="anotherBean"
class="com.letume.spring.study.init.SimpleAnotherBean" scope="prototype"/>
</beans>
下面是main函数，
例1 普通的bean初始化调用过程
/**
* 简单的spring类加载的方法
* <pre>
* ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext(PATH+RESOURCE_CONTEXT);
* SimpleBean simpleBean = context.getBean(SimpleBean.class)
* simpleLoaderSimpleBean.test();
* </pre>
* Created by mitchz on 2014/8/13.
*/
public class SimpleInit
{
private static final String PATH = "";
private static final String RESOURCE_CONTEXT = "simpleContext.xml";
public static void main(String[] args) throws InterruptedException
{
ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext(
PATH + RESOURCE_CONTEXT);
//获取simpleBean
SimpleBean simpleBean = context
.getBean("simpleBean", SimpleBean.class);
simpleBean.test();
//context.registerShutdownHook();
}
}
看下日志：
---执行单例的初始化（为什么会使用单例）
14:36:48.766 [main] DEBUG o.s.b.f.s.DefaultListableBeanFactory - Pre-instantiating singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@29d8a2c5: defining beans [simpleBean,property,anotherBean]; root of factory hierarchy
14:36:48.767 [main] DEBUG o.s.b.f.s.DefaultListableBeanFactory - Creating shared instance of singleton bean 'simpleBean'
---创建bean实例
14:36:48.767 [main] DEBUG o.s.b.f.s.DefaultListableBeanFactory - Creating instance of bean 'simpleBean'
14:36:48.786 [main] DEBUG o.s.b.f.s.DefaultListableBeanFactory - Eagerly caching bean 'simpleBean' to allow for resolving potential circular references
---创建属性的实例
14:36:48.799 [main] DEBUG o.s.b.f.s.DefaultListableBeanFactory - Creating instance of bean 'property'
14:36:48.799 [main] INFO c.l.s.study.init.SimpleBeanProperty - SimpleBeanProperty is loading.
14:36:48.799 [main] DEBUG o.s.b.f.s.DefaultListableBeanFactory - Finished creating instance of bean 'property'
---赋值
14:36:48.838 [main] INFO c.l.spring.study.init.SimpleBean - Property is setting.
14:36:48.840 [main] DEBUG o.s.b.f.s.DefaultListableBeanFactory - Finished creating instance of bean 'simpleBean'
....
---getBean的方法执行时，则直接从cache中取，之前初始化的实例
14:36:48.847 [main] DEBUG o.s.b.f.s.DefaultListableBeanFactory - Returning cached instance of singleton bean 'simpleBean'
14:36:48.847 [main] INFO c.l.spring.study.init.SimpleBean - SimpleBean is loading.SimpleBean{property=SimpleBeanProperty{simpleVariable='test567'}}
14:36:48.849 [main] INFO c.l.s.study.init.SimpleBeanProperty - propertyTest method is invoking.SimpleBeanProperty{simpleVariable='test567'}
从日志中可以看出bean在没有设置scope的时候，默认值为 singletone的。另外即使属性类是 protetype的时候，也会在父bean初始化将其填充。 不会在调用父bean的时候，重新初始化属性所关联的bean。详细见例2
例2，在执行过程中，增加属性修改，咱们再来执行下看看
//修改property bean实例中的变量simpleVariable
simpleBean.getProperty().setSimpleVariable("aaaaa");
//重新获取simpleBean实例
simpleBean = context
.getBean("simpleBean", SimpleBean.class);
//再次执行test方法
simpleBean.test();
看下新增的日志：
15:14:58.447 [main] INFO c.l.spring.study.init.SimpleBean - SimpleBean is loading.SimpleBean{property=SimpleBeanProperty{simpleVariable='aaaaa'}}
15:14:58.447 [main] INFO c.l.s.study.init.SimpleBeanProperty - propertyTest method is invoking.SimpleBeanProperty{simpleVariable='aaaaa'}
看来咱们之前的猜测是对的，
第一、bean的scope默认为SingleTone的
第二、bean的lazyInit为false的
第三、即使属性为prototype也不会再父bean为SingleTone的时重新初始化
例3、再增加两行
//获取property实例
SimpleBeanProperty property = context
.getBean("property", SimpleBeanProperty.class);
//测试propertyTest方法
property.propertyTest();
再看下执行后新增的日志：
15:19:10.331 [main] DEBUG o.s.b.f.s.DefaultListableBeanFactory - Creating instance of bean 'property'
15:19:10.331 [main] INFO c.l.s.study.init.SimpleBeanProperty - SimpleBeanProperty is loading.
15:19:10.331 [main] DEBUG o.s.b.f.s.DefaultListableBeanFactory - Finished creating instance of bean 'property'
15:19:10.331 [main] INFO c.l.s.study.init.SimpleBeanProperty - propertyTest method is invoking.SimpleBeanProperty{simpleVariable='test567'}
由于property的bean由于是prototype的，所以被重新初始化了。
例4、再增加四行：
//获取anotherBean实例
SimpleAnotherBean anotherBean = context
.getBean("anotherBean", SimpleAnotherBean.class);
anotherBean.test();
//设置变量的值
anotherBean.setSimpleVariable("bbbbb");
//重新获取anotherBean实例
anotherBean = context
.getBean("anotherBean", SimpleAnotherBean.class);
anotherBean.test();
大家在看下执行日志：
15:23:13.130 [main] DEBUG o.s.b.f.s.DefaultListableBeanFactory - Creating instance of bean 'anotherBean'
15:23:13.130 [main] INFO c.l.s.study.init.SimpleBeanProperty - SimpleAnotherBean is loading.
15:23:13.130 [main] DEBUG o.s.b.f.s.DefaultListableBeanFactory - Finished creating instance of bean 'anotherBean'
15:23:13.130 [main] INFO c.l.s.study.init.SimpleBeanProperty - test method is invoking.SimpleAnotherBean{simpleVariable='test123'}
15:23:13.131 [main] DEBUG o.s.b.f.s.DefaultListableBeanFactory - Creating instance of bean 'anotherBean'
15:23:13.131 [main] INFO c.l.s.study.init.SimpleBeanProperty - SimpleAnotherBean is loading.
15:23:13.131 [main] DEBUG o.s.b.f.s.DefaultListableBeanFactory - Finished creating instance of bean 'anotherBean'
15:23:13.131 [main] INFO c.l.s.study.init.SimpleBeanProperty - test method is invoking.SimpleAnotherBean{simpleVariable='test123'} bean为prototype的时候，每次都会被新初始化的
通过日志的内容，梳理一下大概初始化逻辑
可以看出主要针对beans context 还有core包。
具体怎么相互协作的，下一节会进一步介绍。