spring开发_spring构造注入Bean

项目结构：

http://www.cnblogs.com/hongten/gallery/image/112399.html

/spring_0004_bean的注入方法/src/com/b510/dao/AnimaleDao.java

package com.b510.dao;
/**
 * 动物抽象类
 * @author Hongten
 *
 */
public interface AnimaleDao {

    /**
     * 动物的say()方法
*/
    public abstract void say();

}

/spring_0004_bean的注入方法/src/com/b510/dao/impl/DogDaoImpl.java

package com.b510.dao.impl;

import com.b510.dao.AnimaleDao;


public class DogDaoImpl implements AnimaleDao {

    private String name;
    
    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    /* (non-Javadoc)
     * @see com.b510.dao.impl.AnimaleDao#say()
*/
    public void say(){
        System.out.println(name+" is a dog,he likes bone");
    }
}

/spring_0004_bean的注入方法/src/com/b510/service/ServiceBean.java

package com.b510.service;

/**
 * ServiceBean接口
 * 
 * @author Hongten
 * 
 */
public interface ServiceBean {

    /**
     * 输出相关信息
*/
    public abstract void myPetSay();

}

/spring_0004_bean的注入方法/src/com/b510/service/impl/ServiceBeanImpl.java

package com.b510.service.impl;

import com.b510.dao.AnimaleDao;
import com.b510.service.ServiceBean;
/**
 * ServiceBean的一个实现类
 * 
 * @author Hongten
 *
 */
public class ServiceBeanImpl implements ServiceBean {

    private AnimaleDao animaleDao;
    
    /* (non-Javadoc)
     * @see com.b510.service.impl.ServiceBean#myPetSay()
*/
    public void myPetSay(){
        animaleDao.say();
    }

    public AnimaleDao getAnimaleDao() {
        return animaleDao;
    }

    /**
     * 设置一个AnimaleDao构造函数，Spring在注入的时候，就是调用此方法进行构造注入的
     * 所以在使用构造注入的时候，一定要有此构造函数
     * @param animaleDao AnimaleDao的一个实例
*/
    public void setAnimaleDao(AnimaleDao animaleDao) {
        this.animaleDao = animaleDao;
    }
}

/spring_0004_bean的注入方法/src/beans.xml

<?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="animaleDao" class="com.b510.dao.impl.DogDaoImpl">
        <property name="name" value="哈巴"></property>
    </bean>
    <bean id="serviceDao" class="com.b510.service.impl.ServiceBeanImpl">
        <property name="animaleDao" ref="animaleDao"></property>
    </bean>
</beans>

/spring_0004_bean的注入方法/src/com/b510/test/SpringTest.java

package com.b510.test;

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

import com.b510.service.ServiceBean;

public class SpringTest {
    public static void main(String[] args) {
        ApplicationContext ctx=new ClassPathXmlApplicationContext("beans.xml");
        ServiceBean serviceBean=(ServiceBean) ctx.getBean("serviceDao");
        serviceBean.myPetSay();
    }
}

运行效果：

2012-3-7 23:34:52 org.springframework.context.support.AbstractApplicationContext prepareRefresh
信息: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@15eb0a9: display name [org.springframework.context.support.ClassPathXmlApplicationContext@15eb0a9]; startup date [Wed Mar 07 23:34:52 CST 2012]; root of context hierarchy
2012-3-7 23:34:52 org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions
信息: Loading XML bean definitions from class path resource [beans.xml]
2012-3-7 23:34:52 org.springframework.context.support.AbstractApplicationContext obtainFreshBeanFactory
信息: Bean factory for application context [org.springframework.context.support.ClassPathXmlApplicationContext@15eb0a9]: org.springframework.beans.factory.support.DefaultListableBeanFactory@161f10f
2012-3-7 23:34:52 org.springframework.beans.factory.support.DefaultListableBeanFactory preInstantiateSingletons
信息: Pre-instantiating singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@161f10f: defining beans [animaleDao,serviceDao]; root of factory hierarchy
哈巴 is a dog,he likes bone