IOC容器配置的三种方式1_默认无参构造

第一步:实体类

package it.heima.Dao;

public class Bean1 {
}

第二步:配置

<?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">

        <!--配置无参构造的IOC-->
    <bean id="bean1" class="it.heima.Dao.Bean1"></bean>
</beans>

第三步:测试

public class Bean1Test {
    Bean1 bean1 ;
    @Before
    public void setUp() throws Exception {
        ClassPathXmlApplicationContext applicationContext = new ClassPathXmlApplicationContext("applicationContext.xml");
        bean1=applicationContext.getBean("bean1", Bean1.class);

    }
    @Test
    public void test(){
        System.out.println(bean1);
    }
}