/Spring/src/beans.xml

/Spring/src/com/zhangpn/daoImpl/UserDaoImpl.java

package com.zhangpn.daoImpl;import com.zhangpn.dao.UserDao;public class UserDaoImpl implements UserDao{	public void run() {		System.out.println("run...");	}}

/Spring/src/com/zhangpn/dao/UserDao.java

package com.zhangpn.dao;public interface UserDao {	public void run();}

/Spring/src/com/zhangpn/Test/Test.java

package com.zhangpn.Test;import org.springframework.context.ApplicationContext;import org.springframework.context.support.ClassPathXmlApplicationContext;import com.zhangpn.dao.UserDao;public class Test {	public static void main(String[] args) {		ApplicationContext applicationContext = new ClassPathXmlApplicationContext("beans.xml");		UserDao userDao = (UserDao) applicationContext.getBean("UserDaoImpl");		userDao.run();	}}　

运行结果

验证Spring已经为我们自动实例化了一个对象。