【spring教程之九】spring注解@Autowired自动装配

1、首先spring的xml配置文件加上一句话

<context:annotation-config></context:annotation-config><!-- 自动装配 -->
 
     <bean id="piano" class="com.test.pro.Instrument">
          <property name="name" value="钢琴"></property>
    </bean>
 
    <bean id="jack" class="com.test.pro.Singer">
    </bean>

2、

package com.test.pro;

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;

public class Singer {
  private Instrument piano;

  
  
  public Instrument getPiano() {
    return piano;
  }


  @Autowired  /*这个地方加上注解，会自动注入*/
  public void setPiano(Instrument piano) {
    this.piano = piano;
  }



  public void saying()
  {
    System.out.println(piano.getName());
  }
}

或者采用直接注入的办法

package com.test.pro;

import org.springframework.beans.factory.annotation.Autowired;

public class Singer {
  @Autowired  /*这个地方加上注解，会自动注入*/
  private Instrument piano;

  public void saying()
  {
    System.out.println(piano.getName());
  }
}

3、测试类

package com.test.pro;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class Main {

  public static void main(String[] args) {
    // TODO Auto-generated method stub
    ApplicationContext ctx=new ClassPathXmlApplicationContext("spring.xml");
    Singer singer=(Singer)ctx.getBean("jack");
    singer.saying();

    
  }
  
  

}

输出结果