Spring构造器注入

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>
	<bean id="UserServiceImpl" class="com.zhangpn.serviceImpl.UserServiceImpl">
		<constructor-arg index="0" ref="UserDaoImpl"></constructor-arg>
	</bean>
</beans>

　　测试：

package com.zhangpn.Test;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.zhangpn.serviceImpl.UserServiceImpl;

public class Test {

	public static void main(String[] args) {
		ApplicationContext applicationContext = new ClassPathXmlApplicationContext("beans.xml");
		UserServiceImpl userDao = (UserServiceImpl) applicationContext.getBean("UserServiceImpl");
		userDao.getUserDao().run();
	}

}

　　结果：