Spring-framwork-core-1.1-1.2

一.IOC容器：
BeanFactory提供了配置框架和基本的功能，ApplicationContext添加了更多的特别的功能
Bean的概念：
bean是一个被Spring IOC容器实例化，组装和管理的对象
配置Bean：xml配置,java注解，java code
传统的是用xml配置
可以使用的数据：类（POJOS）+配置文件=实例准备使用
1.基于注解的容器配置
注解注入是在xml配置之前执行的，后者将会覆盖前者的配置
@Required:
适用于bean属性的设置方法，受影响的bean属性必须在配置时被填充
@Autowire:
利用@Autowire注解进行构造
2.xml配置

<?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.xsd">

    <bean id="..." class="...">
        <!-- collaborators and configuration for this bean go here -->
    </bean>

    <bean id="..." class="...">
        <!-- collaborators and configuration for this bean go here -->
    </bean>

    <!-- more bean definitions go here -->

</beans>

id作为bean的标识，class指向全局限定类名
3.java-based-configuration:

1.2.2 实例化容器
提供给ApplicationContext构造器的位置路径，允许容器从各种外部资源加载配置元数据

ApplicationContext context = new ClassPathXmlApplicationContext("services.xml", "daos.xml");

service的xml配置

<?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.xsd">

    <!-- services -->

    <bean id="petStore" class="org.springframework.samples.jpetstore.services.PetStoreServiceImpl">
        <property name="accountDao" ref="accountDao"/>
        <property name="itemDao" ref="itemDao"/>
        <!-- additional collaborators and configuration for this bean go here -->
    </bean>

    <!-- more bean definitions for services go here -->

</beans>

dao层的配置

<?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.xsd">

    <bean id="accountDao"
        class="org.springframework.samples.jpetstore.dao.jpa.JpaAccountDao">
        <!-- additional collaborators and configuration for this bean go here -->
    </bean>

    <bean id="itemDao" class="org.springframework.samples.jpetstore.dao.jpa.JpaItemDao">
        <!-- additional collaborators and configuration for this bean go here -->
    </bean>

    <!-- more bean definitions for data access objects go here -->

</beans>

通常一个xml文件配置包含结构的一层
1.2.3使用容器：
ApplicationContext是一个高级工厂的接口，它能维护不同的bean,及其依赖项的注册表

// create and configure beans
ApplicationContext context = new ClassPathXmlApplicationContext("services.xml", "daos.xml");

// retrieve configured instance
PetStoreService service = context.getBean("petStore", PetStoreService.class);

// use configured instance
List<String> userList = service.getUsernameList();