Spring 1 IoC 1 开始

Spring  IoC容器的基础都在 org.springframework.beans 和 org.springframework.context 包中。提供了2类容器实现：org.springframework.beans.factory.BeanFactory 和 org.springframework.context.ApplicationContext，主要使用的是ApplicationContext

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经常使用的3个ApplicationContext的实现：

ClassPathXmlApplicationContext，FileSystemXmlApplicationContext，XmlWebApplicationContext

ApplicationContextcontext=new FileSystemXmlApplicationContext("c:/foo.xml");

ApplicationContextcontext=new ClassPathXmlApplicationContext("foo.xml");

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Spring 配置文件基础，一个典型的配置文件：

<?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-3.1.xsd">

     <import resource=”resource1.xml”/> 

    <!-- oracle bean used for a few examples -->

    <bean id="oracle" name= "wiseworm" class="com.apress.prospring3.ch4.BookwormOracle" />

</beans>

import用于导入其他配置文件，<import>标签可以放在<beans>下的任何位置，没有顺序关系。可以使用下面格式：

file:C:/config/services.xml

classpath:/config/services.xml

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Spring 提供的命名空间：

<?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:p="http://www.springframework.org/schema/p"

xmlns:c="http://www.springframework.org/schema/c"

xmlns:util="http://www.springframework.org/schema/util"

xsi:schemaLocation="http://www.springframework.org/schema/beans

http://www.springframework.org/schema/beans/spring-beans-3.1.xsd

http://www.springframework.org/schema/context

http://www.springframework.org/schema/context/spring-context-3.1.xsd

http://www.springframework.org/schema/util

http://www.springframework.org/schema/util/spring-util-3.1.xsd">

</beans>

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ApplicationContext context =  new ClassPathXmlApplicationContext(new String[] {"services.xml", "daos.xml"});

PetStoreServiceImpl service = context.getBean("petStore", PetStoreServiceImpl.class);

List userList = service.getUsernameList();

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public class DeclareSpringComponents {

        public static void main(String[] args) {

              GenericXmlApplicationContext ctx = new GenericXmlApplicationContext();

              ctx.load( "classpath:app-context-xml.xml" );

               //ctx.load("classpath:app-context-annotation.xml");

              ctx.refresh();             

              

              MessageProvider messageProvider = ctx.getBean( "messageProvider", MessageProvider.class );

              System. out.println(messageProvider.getMessage());

       }

}