SpringIOC的HelloWorld

一、建立Java工程，导入spring ioc必须的jar包

注意：commons-logging-1.2.jar这个包是来自于apache的日志包。

二、编写Dao接口和实现类

CustomerDao接口：

package com.yiidian.dao;
/*** * @author http://www.yiidian.com**/
public interface CustomerDao {public void save();
}

CustomerDaoImpl实现类：

package com.yiidian.dao.impl;import com.yiidian.dao.CustomerDao;
/*** @author http://www.yiidian.com**/
public class CustomerDaoImpl implements CustomerDao {@Overridepublic void save() {System.out.println("把客户数据保存到mysql数据");}}

三、在src目录下建立applicationContext.xml

Spring版本？

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"xmlns:p="http://www.springframework.org/schema/p"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.xsd"><!-- 创建 CustomerDaoImpl对象--><bean id="customerDao" class="com.yiidian.dao.impl.CustomerDaoImpl"></bean></beans>

四、编写测试代码

package com.yiidian.test;import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;import com.yiidian.dao.CustomerDao;
/*** @author http://www.yiidian.com**/
public class Demo1 {@Testpublic void test1(){//1.初始化SpringIOC容器ApplicationContext ac = new ClassPathXmlApplicationContext("applicationContext.xml");//2.从IOC容器取出对象CustomerDao customerDao = (CustomerDao)ac.getBean("customerDao"); System.out.println(customerDao);}
}

四、运行Demo测试类的test方法，结果为：

源码下载：http://pan.baidu.com/s/1mhNRw8K