Spring反向控制的一個小例子

1.首先附上我的eclipse中創建Spring項目的目錄結構：

2.Spring推薦使用接口，首先定義兩個接口：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.建立接口的實現類：

DaoImpl:

package com.spring.impl;

import java.util.Calendar;

import com.spring.inter.IDao;

public class DaoImpl implements IDao {

	@Override
	public String sayHello(String name) {
		// TODO Auto-generated method stub
		int 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;
	@Override
	public void service(String name) {
		System.out.println(idao.sayHello(name));
		
	}
	public IDao getIdao() {
		return idao;
	}
	public void setIdao(IDao idao) {
		this.idao = idao;
	}

}

4.然後對Spring的配置文件applicationContext.xml進行配置：

<?xml version="1.0" encoding="UTF-8"?>
<beans
	xmlns="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.建立測試類：

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 {
	@Test
	public void test()
	{
		XmlBeanFactory factory = new XmlBeanFactory( new ClassPathResource("applicationContext.xml"));
		
		IService hello =(IService) factory.getBean("serviceImpl");
		hello.service("HelloBean");
		factory.destroySingletons();
		
	}
}

 

輸出結果爲：早上好,HelloBean

 

早上好,HelloBean