Spring中Xml属性配置的解析全过程记录

<properties>
 <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 <maven.compiler.source>1.8</maven.compiler.source>
 <maven.compiler.target>1.8</maven.compiler.target>
 <spring.version>5.2.8.RELEASE</spring.version>
 </properties>

 <dependencies>
 <dependency>
  <groupId>junit</groupId>
  <artifactId>junit</artifactId>
  <version>4.13</version>
 </dependency>
 <dependency>
  <groupId>org.springframework</groupId>
  <artifactId>spring-context</artifactId>
  <version>${spring.version}</version>
 </dependency>
 <dependency>
  <groupId>org.projectlombok</groupId>
  <artifactId>lombok</artifactId>
  <version>1.16.20</version>
 </dependency>
 <!-- 日志相关依赖 -->
 <dependency>
  <groupId>org.slf4j</groupId>
  <artifactId>slf4j-api</artifactId>
  <version>1.7.10</version>
 </dependency>
 <dependency>
  <groupId>ch.qos.logback</groupId>
  <artifactId>logback-classic</artifactId>
  <version>1.1.2</version>
 </dependency>
 <dependency>
  <groupId>ch.qos.logback</groupId>
  <artifactId>logback-core</artifactId>
  <version>1.1.2</version>
 </dependency>
 </dependencies>

<beans xmlns="http://www.springframework.org/schema/beans"
 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 xmlns:context="http://www.springframework.org/schema/context"
 xsi:schemaLocation="
	http://www.springframework.org/schema/beans
	http://www.springframework.org/schema/beans/spring-beans.xsd
 http://www.springframework.org/schema/context
 http://www.springframework.org/schema/context/spring-context.xsd"
 default-lazy-init="false">


 <bean id="student" class="com.rosh.bean.StudentBean"/>

 <context:component-scan base-package="com.rosh.service"/>

</beans>

@Data
@AllArgsConstructor
@NoArgsConstructor
@ToString
public class StudentBean {


 private String name = "rosh";

 private String school = "杜桥中学";

 private String hobby = "篮球";

}

public class RoshTest {

 @Test
 public void mainTest(){
 ClassPathXmlApplicationContext applicationContext=new ClassPathXmlApplicationContext("applicationContext.xml");
 StudentBean student = applicationContext.getBean(StudentBean.class);
 System.out.println(student.toString());

 }
}

1 ClassPathXmlApplicationContext调用构造方法。
2 AbstractApplicationContext：
 (1) 调用refresh()方法。
 (2) 调用obtainFreshBeanFactory()方法。
3 AbstractRefreshableApplicationContext调用refreshBeanFactory() 方法。
4 AbstractXmlApplicationContext：
	(1) loadBeanDefinitions(DefaultListableBeanFactory beanFactory)方法。创建XML解析器。
 (2) 调用loadBeanDefinitions(XmlBeanDefinitionReader reader)方法。
5 AbstractBeanDefinitionReader：
	(1) loadBeanDefinitions(String... locations)方法。  
	(2) loadBeanDefinitions(String location)方法。
	(3) loadBeanDefinitions(String location, @Nullable Set<Resource> actualResources)方法，将XML解析成Resource对象。	
	(4) loadBeanDefinitions(Resource... resources)方法。
6 XmlBeanDefinitionReader:
	(1) loadBeanDefinitions(Resource resource) 方法。
	(2) loadBeanDefinitions(EncodedResource encodedResource) 方法。
	(3) doLoadBeanDefinitions(InputSource inputSource, Resource resource)方法。
	(4)	registerBeanDefinitions(Document doc, Resource resource)方法。创建Document解析器。
7 DefaultBeanDefinitionDocumentReader：
 (1) registerBeanDefinitions(Document doc, XmlReaderContext readerContext)方法。
 (2) doRegisterBeanDefinitions(Element root)方法。
 (3) parseBeanDefinitions(Element root, BeanDefinitionParserDelegate delegate) 方法解析默认标签、自定义标签。