spring入门（一）

<?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
        https://www.springframework.org/schema/beans/spring-beans.xsd">

    <bean id="accountDao" class="dao.impl.AccountDaoImpl"></bean>

</beans>

获取ApplicationContext对象的三种方式

//从文件系统获取，填写在硬盘上的绝对路径
FileSystemXmlApplicationContext("bean.xml");

AnnotationConfigApplicationContext("");

ClassPathXmlApplicationContext("bean.xml");

public static void main(String[] args) {
        //读取配置文件
        ApplicationContext applicationContext = new ClassPathXmlApplicationContext("bean.xml");
        //根据配置的id获取指定对象
        AccountDao accountDao = applicationContext.getBean("accountDao",AccountDao.class);
        //测试方法
        accountDao.saveAccount();
    }