Spring底层核心架构
相关的配置类
1. user类
package com.zhouyu.service;
import org.springframework.stereotype.Component;
public class User {
}
2. AppConfig类
package com.zhouyu;
import org.springframework.context.annotation.*;
import org.springframework.scheduling.annotation.EnableScheduling;
import javax.sql.DataSource;
@ComponentScan("com.zhouyu")
@EnableScheduling
@PropertySource("classpath:spring.properties")
public class AppConfig {
}
3.spring.xml
<?xml version="1.0" encoding="UTF-8"?>
<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"
xmlns:aop="http://www.springframework.org/schema/aop"
xsi:schemaLocation="http://www.springframework.org/schema/beans
https://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/aop https://www.springframework.org/schema/aop/spring-aop.xsd"
>
<context:component-scan base-package="com.zhouyu"/>
<bean id="user1" class="com.zhouyu.service.User" scope="prototype"/>
</beans>
1.BeanDefinition
- class,表示Bean类型
- scope,表示Bean作用域,单例或原型等
- lazyInit:表示Bean是否是懒加载
- initMethodName:表示Bean初始化时要执行的方法
- destroyMethodName:表示Bean销毁时要执行的方法
- 还有很多…
(1)BeanDefinition简单使用
package com.zhouyu;
import com.zhouyu.service.User;
import org.springframework.beans.factory.support.AbstractBeanDefinition;
import org.springframework.beans.factory.support.BeanDefinitionBuilder;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
public class Test {
public static void main(String[] args) {
AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(AppConfig.class);
AbstractBeanDefinition beanDefinition = BeanDefinitionBuilder.genericBeanDefinition().getBeanDefinition();
beanDefinition.setBeanClass(User.class);
context.registerBeanDefinition("user", beanDefinition);
System.out.println(context.getBean("user"));
}
}
说明:AbstractBeanDefinition可以把对象注册到spring容器中。
2.BeanDefinition设置相关的属性
package com.zhouyu;
import com.zhouyu.service.User;
import org.springframework.beans.factory.support.AbstractBeanDefinition;
import org.springframework.beans.factory.support.BeanDefinitionBuilder;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
public class Test {
public static void main(String[] args) {
AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(AppConfig.class);
AbstractBeanDefinition beanDefinition = BeanDefinitionBuilder.genericBeanDefinition().getBeanDefinition();
beanDefinition.setBeanClass(User.class);
beanDefinition.setScope("prototype");
beanDefinition.setLazyInit(true);
context.registerBeanDefinition("user", beanDefinition);
System.out.println(context.getBean("user"));
System.out.println(context.getBean("user"));
}
}
2.BeanDefinitionReader
1.BeanDefinitionReader简单使用
package com.zhouyu;
import com.zhouyu.service.User;
import org.springframework.beans.factory.support.AbstractBeanDefinition;
import org.springframework.beans.factory.support.BeanDefinitionBuilder;
import org.springframework.context.annotation.AnnotatedBeanDefinitionReader;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
public class Test {
public static void main(String[] args) {
AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(AppConfig.class);
AnnotatedBeanDefinitionReader annotatedBeanDefinitionReader = new AnnotatedBeanDefinitionReader(context);
annotatedBeanDefinitionReader.register(User.class);
System.out.println(context.getBean("user"));
}
}
3.XmlBeanDefinitionReader
package com.zhouyu;
import com.zhouyu.service.User;
import org.springframework.beans.factory.support.AbstractBeanDefinition;
import org.springframework.beans.factory.support.BeanDefinitionBuilder;
import org.springframework.beans.factory.xml.XmlBeanDefinitionReader;
import org.springframework.context.annotation.AnnotatedBeanDefinitionReader;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
public class Test {
public static void main(String[] args) {
AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(AppConfig.class);
XmlBeanDefinitionReader xmlBeanDefinitionReader = new XmlBeanDefinitionReader(context);
int i = xmlBeanDefinitionReader.loadBeanDefinitions("spring.xml");
System.out.println(context.getBean("user"));
}
}
4.ClassPathBeanDefinitionScanner
package com.zhouyu;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import org.springframework.context.annotation.ClassPathBeanDefinitionScanner;
public class Test {
public static void main(String[] args) {
AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext();
context.refresh();
ClassPathBeanDefinitionScanner scanner = new ClassPathBeanDefinitionScanner(context);
scanner.scan("com.zhouyu");
System.out.println(context.getBean("userService"));
}
}
5.BeanFactory
1.DefaultListableBeanFactory的使用
package com.zhouyu;
import com.zhouyu.service.User;
import org.springframework.beans.factory.support.AbstractBeanDefinition;
import org.springframework.beans.factory.support.BeanDefinitionBuilder;
import org.springframework.beans.factory.support.DefaultListableBeanFactory;
public class Test {
public static void main(String[] args) {
DefaultListableBeanFactory beanFactory = new DefaultListableBeanFactory();
AbstractBeanDefinition beanDefinition = BeanDefinitionBuilder.genericBeanDefinition().getBeanDefinition();
beanDefinition.setBeanClass(User.class);
beanFactory.registerBeanDefinition("user", beanDefinition);
System.out.println(beanFactory.getBean("user"));
}
}
它实现了很多接口,表示,它拥有很多功能:
- AliasRegistry:支持别名功能,一个名字可以对应多个别名
- BeanDefinitionRegistry:可以注册、保存、移除、获取某个BeanDefinition
- BeanFactory:Bean工厂,可以根据某个bean的名字、或类型、或别名获取某个Bean对象
- SingletonBeanRegistry:可以直接注册、获取某个单例Bean
- SimpleAliasRegistry:它是一个类,实现了AliasRegistry接口中所定义的功能,支持别名功能
- ListableBeanFactory:在BeanFactory的基础上,增加了其他功能,可以获取所有BeanDefinition的beanNames,可以根据某个类型获取对应的beanNames,可以根据某个类型获取{类型:对应的Bean}的映射关系
- HierarchicalBeanFactory:在BeanFactory的基础上,添加了获取父BeanFactory的功能
- DefaultSingletonBeanRegistry:它是一个类,实现了SingletonBeanRegistry接口,拥有了直接注册、获取某个单例Bean的功能
- ConfigurableBeanFactory:在HierarchicalBeanFactory和SingletonBeanRegistry的基础上,添加了设置父BeanFactory、类加载器(表示可以指定某个类加载器进行类的加载)、设置Spring EL表达式解析器(表示该BeanFactory可以解析EL表达式)、设置类型转化服务(表示该BeanFactory可以进行类型转化)、可以添加BeanPostProcessor(表示该BeanFactory支持Bean的后置处理器),可以合并BeanDefinition,可以销毁某个Bean等等功能
- FactoryBeanRegistrySupport:支持了FactoryBean的功能
- AutowireCapableBeanFactory:是直接继承了BeanFactory,在BeanFactory的基础上,支持在创建Bean的过程中能对Bean进行自动装配
- AbstractBeanFactory:实现了ConfigurableBeanFactory接口,继承了FactoryBeanRegistrySupport,这个BeanFactory的功能已经很全面了,但是不能自动装配和获取beanNames
- ConfigurableListableBeanFactory:继承了ListableBeanFactory、AutowireCapableBeanFactory、ConfigurableBeanFactory
- AbstractAutowireCapableBeanFactory:继承了AbstractBeanFactory,实现了AutowireCapableBeanFactory,拥有了自动装配的功能
- DefaultListableBeanFactory:继承了AbstractAutowireCapableBeanFactory,实现了ConfigurableListableBeanFactory接口和BeanDefinitionRegistry接口,所以DefaultListableBeanFactory的功能很强大
6.ApplicationContext
1.AnnotationConfigApplicationContext
package com.zhouyu;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
public class Test {
public static void main(String[] args) {
AnnotationConfigApplicationContext applicationContext=new AnnotationConfigApplicationContext(AppConfig.class);
System.out.println(applicationContext.containsBean("user"));
System.out.println(applicationContext.containsBean("userService"));
for (String beanDefinitionName : applicationContext.getBeanDefinitionNames()) {
System.out.println(beanDefinitionName);
}
}
}
2.AnnotationConfigApplicationContext
package com.zhouyu;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class Test {
public static void main(String[] args) {
ClassPathXmlApplicationContext applicationContext=new ClassPathXmlApplicationContext("spring.xml");
System.out.println(applicationContext.containsBean("user"));
System.out.println(applicationContext.containsBean("userService"));
for (String beanDefinitionName : applicationContext.getBeanDefinitionNames()) {
System.out.println(beanDefinitionName);
}
}
}
3.国际化
AppConfig
package com.zhouyu;
import org.springframework.context.MessageSource;
import org.springframework.context.annotation.*;
import org.springframework.context.support.ResourceBundleMessageSource;
import org.springframework.scheduling.annotation.EnableScheduling;
@ComponentScan("com.zhouyu")
@EnableScheduling
@PropertySource("classpath:spring.properties")
public class AppConfig {
@Bean
public MessageSource messageSource() {
ResourceBundleMessageSource messageSource = new ResourceBundleMessageSource();
messageSource.setBasename("message");
return messageSource;
}
}
UserService
package com.zhouyu.service;
import org.springframework.aop.framework.AopContext;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.BeanNameAware;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.config.BeanPostProcessor;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Lazy;
import org.springframework.context.annotation.Scope;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Component;
import org.springframework.transaction.annotation.Propagation;
import org.springframework.transaction.annotation.Transactional;
import javax.annotation.PostConstruct;
import java.util.Date;
import java.util.Locale;
@Component
public class UserService implements ApplicationContextAware {
@Autowired
private OrderService orderService;
private ApplicationContext applicationContext;
public void test(){
System.out.println(applicationContext.getMessage("test", null, new Locale("de")));
}
@Override
public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
this.applicationContext=applicationContext;
}
}
Test
package com.zhouyu;
import com.zhouyu.service.UserService;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import java.util.Locale;