Spring实例：Ioc依赖注入的一个例子

1 package SSHinterface;
2 
3 public interface Person {
4     public void useAxe();
5 }

1 package SSHinterface;
2 
3 public interface Axe {
4     public String chop() ;
5 }

package implement;

import SSHinterface.Axe;
import SSHinterface.Person;

public class Chinses implements Person{
    private Axe axe;
    
    public Chinses(){
        
    }
    public void setAxe(Axe axe) {
        this.axe = axe;
    }

    public void useAxe() {
        // TODO Auto-generated method stub
        System.err.println(axe.chop());
    }
    
}

package implement;

import SSHinterface.Axe;

public class SteelAxe implements Axe{
    public SteelAxe(){}
    
    
    public String chop() {
        // TODO Auto-generated method stub
        return "铁斧头比较快";
    }
 
}

package implement;

import SSHinterface.Axe;

public class StoneAxe implements Axe{
    
    public StoneAxe(){}
    
    public String chop() {
        // TODO Auto-generated method stub
        return "用斧头砍树";
    }
    
}

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <beans
 3     xmlns="http://www.springframework.org/schema/beans"
 4     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 5     xmlns:p="http://www.springframework.org/schema/p"
 6     xsi:schemaLocation="http://www.springframework.org/schema/beans 
 7                         http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">
 8 <!--spring会调用无参构造器进行实例，调用setter注射属性值，配置  chinses的实例，实现了implement.Chinses-->
 9     <bean id="chinses" class="implement.Chinses">
10     <!-- property标签：通过property接收，如果是个对象用ref，如果是个属性就用value -->
11     <!-- 此处将，steelAxe注入给axe属性 -->
12         <property name="axe" ref="steelAxe"></property>
13     </bean>
14     <bean id="stoneAxe" class="implement.StoneAxe"></bean>
15     <bean id="steelAxe" class="implement.SteelAxe"></bean>
16 
17 </beans>

 1 package SSHtest;
 2 
 3 import org.springframework.context.ApplicationContext;
 4 import org.springframework.context.support.ClassPathXmlApplicationContext;
 5 
 6 import SSHinterface.Person;
 7 
 8 import example.exampleBean;
 9 
10 public class SSHtest {
11     public static void main(String[] args) {
12         ApplicationContext app = new ClassPathXmlApplicationContext("applicationContext.xml");
13         Person china = (Person) app.getBean("chinses");//根据xml的name来获取bean，相对于new Chinses，此处不需要在java代码里选择用什么样的斧头，因为在xml里进行了选择，
14         china.useAxe();
15     }
16 }