Spring反向控制的一个小例子

1.首先附上我的eclipse中创建Spring项目的目录结构：

2.Spring推荐使用接口，首先定义两个接口：IDao 和IService

IDao接口：

 

package com.spring.inter;public interface IDao {public String sayHello(String name);}

 

IService接口：

package com.spring.inter;public interface IService {public void service(String name);}

3.建立接口的实现类：

DaoImpl:

package com.spring.impl;import java.util.Calendar;import com.spring.inter.IDao;public class DaoImpl implements IDao {@Overridepublic String sayHello(String name) {// TODO Auto-generated method stubint hour = Calendar.getInstance().get(Calendar.HOUR_OF_DAY);if(hour<6)return "凌晨好,"+name;if(hour<12)return "早上好,"+name;if(hour<13)return "中午好,"+name;if(hour<16)return "下午好,"+name;return "晚上好,"+name;}}

ServiceImpl:

public class ServiceImpl implements IService {private IDao idao;@Overridepublic void service(String name) {System.out.println(idao.sayHello(name));}public IDao getIdao() {return idao;}public void setIdao(IDao idao) {this.idao = idao;}}

4.然后对Spring的配置文件applicationContext.xml进行配置：

<?xml version="1.0" encoding="UTF-8"?><beansxmlns="http://www.springframework.org/schema/beans"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xmlns:p="http://www.springframework.org/schema/p"xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd"><bean id="daoImpl" class="com.spring.impl.DaoImpl"></bean><bean id="serviceImpl" class="com.spring.service.ServiceImpl">    <property name="idao" ref="daoImpl"></property></bean></beans>

 

5.建立测试类：

package com.spring.junit;import org.junit.Test;import org.springframework.beans.factory.xml.XmlBeanFactory;import org.springframework.core.io.ClassPathResource;import com.spring.inter.IService;public class test1 {@Testpublic void test(){XmlBeanFactory factory = new XmlBeanFactory( new ClassPathResource("applicationContext.xml"));IService hello =(IService) factory.getBean("serviceImpl");hello.service("HelloBean");factory.destroySingletons();}}

 

输出结果为：早上好,HelloBean

 

早上好,HelloBean