Spring的控制反转（依赖注入）,及两种注入方式

1，提供构造函数来让spring实现构造注入

    public class PersonService {
	private String name;
    //提供bean的构造函数，让spring用构造注入的方式来构造cibean
	public PersonService(String name) {
        this.name = name;
	}
	public void info(){
		System.out.println("此人的名字为：" + name);
	}
      }

2，提供setter函数来让spring实现setter注入

   package com.supan.spring;
   public interface Person {
	public void useAxe();
   }
   package com.supan.spring;
   public interface Axe {
	public String chop();
   }
   package com.supan.spring;
   public class StoneAxe implements Axe {
	public String chop() {
		return "石斧砍柴好慢";
	}
   }
 package com.supan.spring;
import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
[color=red]//实现ApplicationContextAware接口让该bean持有了容器的引用。[/color]
public class Chinese implements Person,ApplicationContextAware {
	private ApplicationContext  atx;
	private Axe axe;
	public Axe getAxe() {
		return axe;
	}
	public void setAxe(Axe axe) {
		this.axe = axe;
	}
	public void useAxe() {
         System.out.println(axe.chop());
	}
	@Override
	public void setApplicationContext(ApplicationContext atx) 
			throws BeansException {
		this.atx = atx;
	}
	public ApplicationContext getContext(){
		return atx;
	}
}

3，spring配置文件

    <beans xmlns="http://www.springframework.org/schema/beans"    
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"    
    xmlns:tx="http://www.springframework.org/schema/tx"    
    xmlns:aop="http://www.springframework.org/schema/aop"    
    xmlns:context="http://www.springframework.org/schema/context"    
    xsi:schemaLocation="http://www.springframework.org/schema/aop       
      http://www.springframework.org/schema/aop/spring-aop-3.0.xsd     
      http://www.springframework.org/schema/beans       
      http://www.springframework.org/schema/beans/spring-beans-3.0.xsd     
      http://www.springframework.org/schema/context     
      http://www.springframework.org/schema/context/spring-context-3.0.xsd     
      http://www.springframework.org/schema/tx       
      http://www.springframework.org/schema/tx/spring-tx-3.0.xsd">   
      <bean id="personService" class="PersonService">
         <!-- 采用构造注入的方式 -->
         <constructor-arg index="0" value="chenchaoyang"></constructor-arg>
      </bean>
      <bean id="chinese" class="com.supan.spring.Chinese">
           <!-- 采用setter注入的方式 -->
           <property name="axe" ref="stoneAxe"></property>
      </bean>
      <bean id="stoneAxe" class="com.supan.spring.StoneAxe"></bean>
     </beans>

3，测试类；

  import org.springframework.context.ApplicationContext;
  import org.springframework.context.support.ClassPathXmlApplicationContext;
  import com.supan.spring.Person;
  public class SpringTest {
	public static void main(String[] args) {
		//创建spring的ApplicationContext
		ApplicationContext ctx = new    
           ClassPathXmlApplicationContext("applicationContext.xml");
		PersonService p =       
          ctx.getBean("personService",PersonService.class);
	    p.info();
         System.out.println(p2.getContext() == ctx);
	    Chinese p2 = ctx.getBean("chinese",Chinese.class);
        p2.useAxe();	    
		System.out.println(ctx);
	}
  }

4，结果：
   此人的名字为：chenchaoyang
   石斧砍柴好慢