SPring（3）-@autowired

SPring 中一个类中调用另一些bean,一开始是xml格式配置的，后来变的更灵活，用了@autowired。
1.配置文件的方法
2.@autowired方法
 

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例：有三个类，boss office car
1.配置文件的方法
   1.1 bean.xml
         car 和office 作为 boss 的属性
        

<?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-2.5.xsd">    
    <bean id="boss" class="com.baobaotao.Boss">    
        <property name="car" ref="car"/>    
        <property name="office" ref="office" />    
    </bean>    
    <bean id="office" class="com.baobaotao.Office">    
        <property name="officeNo" value="002"/>    
    </bean>    
    <bean id="car" class="com.baobaotao.Car" scope="singleton">    
        <property name="brand" value=" 红旗 CA72"/>    
        <property name="price" value="2000"/>    
    </bean>    

</beans>    

1.2 调用
 

public class Boss 
{    
    private Car car;    
    private Office office;    
    // 省略 get/setter  
        
    @Override   
    public String toString() 
   {    
        return "car:" + car + "/n" + "office:" + office;    
    }    

} 

import org.springframework.context.ApplicationContext;    
import org.springframework.context.support.ClassPathXmlApplicationContext;    
public class AnnoIoCTest {      

public static void main(String[] args) 
{    
        String[] locations = {"beans.xml"};    
        ApplicationContext ctx =     
            new ClassPathXmlApplicationContext(locations);    
        Boss boss = (Boss) ctx.getBean("boss");    
        System.out.println(boss);    
    }    
} 

       
2.@autowired方法
    boss car office 三个类松耦合，就是没啥关系，灵活装配用了@autowired方法。
   2.1 applicationContext.xml 多加一条    

 <bean class="org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor"/> 

2.2 bean.xml
  三个bean 是独立的

<?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-2.5.xsd">    
    <!-- 该 BeanPostProcessor 将自动起作用，对标注 @Autowired 的 Bean 进行自动注入 -->    
    <bean class="org.springframework.beans.factory.annotation.   
        AutowiredAnnotationBeanPostProcessor"/>    
    <!-- 移除 boss Bean 的属性注入配置的信息 -->     
    <bean id="boss" class="com.baobaotao.Boss"/>     
    <bean id="office" class="com.baobaotao.Office">    
        <property name="officeNo" value="001"/>    
    </bean>    
    <bean id="car" class="com.baobaotao.Car" scope="singleton">    
        <property name="brand" value=" 红旗CA72"/>    
        <property name="price" value="2000"/>    
    </bean>    
</beans> 

2.3JAVA代码 想怎么用，在前面加上关键词 @Autowired

import org.springframework.beans.factory.annotation.Autowired;    
public class Boss
{   
    @Autowired   
    private Car car;    
   @Autowired   
   private Office office;    
}    

public class Boss 
{    
    private Car car;    
    private Office office;    
    @Autowired   
    public Boss(Car car ,Office office){    
        this.car = car;    
        this.office = office ;    
    }