Spring入门小实例

/Spring/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.xsd">
                        
	<bean id="UserDaoImpl" class="com.zhangpn.daoImpl.UserDaoImpl"></bean>
</beans>

/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。