菜鸟看spring源码(0)之BeanFactory的注册与依赖绑定

先贴几个基本类：

代码清单1#User类

package test;
public class User{
	private String name;
	
	User(){}
	
	User(String name){
		this.name = name;
	}
	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}
		
}

代码清单2#UserDao.java

package test;
public class UserDao{
	public void add(User user){
		System.out.println("添加user:"+user.getName());
	}
}

代码清单3#UserService.java

package test;
public class UserService{
	
	private UserDao userDao;
	
	UserService(){
	}
	UserService(UserDao userDao){
		this.userDao = userDao;
	}
	
	public void add(User user){
		userDao.add(user);
	}

	public UserDao getUserDao() {
		return userDao;
	}

	public void setUserDao(UserDao userDao) {
		this.userDao = userDao;
	};
}

下面开始测试用例

在代码中实现beanfatory的注入与依赖绑定，基本让人明白getBean方法大概是个什么过程

接口BeanDefinitionRegistry实现了DefaultListableBeanFactory接口，

DefaultListableBeanFactory实现了BeanFactory接口。

代码清单4#test.java 通过代码实现beanfatory的注入与依赖绑定

package test;

import org.springframework.beans.MutablePropertyValues;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.config.ConstructorArgumentValues;
import org.springframework.beans.factory.support.AbstractBeanDefinition;
import org.springframework.beans.factory.support.BeanDefinitionRegistry;
import org.springframework.beans.factory.support.DefaultListableBeanFactory;
import org.springframework.beans.factory.support.RootBeanDefinition;

public class Test {

	public static void main(String[] args) {
		
		DefaultListableBeanFactory beanRegister = new DefaultListableBeanFactory();
		
		BeanFactory beanfactory = getFactory(beanRegister);
		
		UserService userService = (UserService) beanfactory.getBean("userService");
		
		userService.add(new User("test"));
	}
	
	public static BeanFactory getFactory(BeanDefinitionRegistry registry){
		
		AbstractBeanDefinition userDao = new RootBeanDefinition(UserDao.class);
		AbstractBeanDefinition userService = new RootBeanDefinition(UserService.class);
		//将bean注册到容器中
		registry.registerBeanDefinition("userDao", userDao);
		registry.registerBeanDefinition("userService", userService);
		//绑定依赖关系
		//1.通过构造方法注入
		ConstructorArgumentValues argValues = new ConstructorArgumentValues();
		argValues.addIndexedArgumentValue(0, userDao);
		//argValues.addIndexedArgumentValue(1, ...);
		userService.setConstructorArgumentValues(argValues);
		//2.通过setter方法注入
		MutablePropertyValues propertyValues = new MutablePropertyValues();
		propertyValues.addPropertyValue("userDao", userDao);
		userService.setPropertyValues(propertyValues);
		//绑定完成
		return (BeanFactory) registry;
		
	}
}

通过xml配置文件实现，debug也就是从这段代码开始了，，，解析“classpath:userservice.xml”字符串，通过resource接口读取资源(在这里是classpathResouce)，解析bean标签，生成对应BeanDefinition ，， ，当然需要适当取舍，不然代码太多一下根本看不完，关键是不一定看得懂


代码清单5#TestFromXML.java 通过xml配置文件

package test;

import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.support.DefaultListableBeanFactory;
import org.springframework.beans.factory.xml.XmlBeanDefinitionReader;

public class TestFromXMl {

	public static void main(String[] args) {
		DefaultListableBeanFactory beanRegister = new DefaultListableBeanFactory();
		
		BeanFactory beanfactory = getFactory(beanRegister);
		
		UserService userService = (UserService) beanfactory.getBean("userService");
		
		userService.add(new User("test"));
	}

	private static BeanFactory getFactory(DefaultListableBeanFactory beanRegister) {
		
		XmlBeanDefinitionReader xmlBeanReader = new XmlBeanDefinitionReader(beanRegister);
		xmlBeanReader.loadBeanDefinitions("classpath:userService.xml");
		
		return beanRegister;
	}
	
	
}

代码清单6#userService.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" 
	xsi:schemaLocation="http://www.springframework.org/schema/beans
         http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">          
	<bean id="userService" class="test.UserService" >
		<constructor-arg index="0">
			<ref bean="userDao"/>
		</constructor-arg>
	</bean>
	<bean id="userDao" class="test.UserDao"></bean>
</beans>

待续,,,