6_Spring_Bean的自动装配

落日映苍穹つ 2023-09-30 19:57 86阅读 0赞

bean自动装配

通过property标签可以手动指定给属性进行注入

我们也可以通过自动转配,完成属性的自动注入,就是自动装配,可以简化DI的配置

准备实体类

package com.msb.bean;
    /**
     * @Author: Ma HaiYang
     * @Description: MircoMessage:Mark_7001
     */
    public class Dept {
    }

![1429300c0349fd0bd04ebb86ce6c1307.gif][]

![869ae6fadacd10e6ec09ac09c67f59b4.gif][]

package com.msb.bean;
    /**
     * @Author: Ma HaiYang
     * @Description: MircoMessage:Mark_7001
     */
    public class Emp {
        private Dept dept;
        @Override
        public String toString() {
            return "Emp{" +
                    "dept=" + dept +
                    '}';
        }
        public Dept getDept() {
            return dept;
        }
        public void setDept(Dept dept) {
            this.dept = dept;
        }
        public Emp() {
        }
        public Emp(Dept dept) {
            this.dept = dept;
        }
    }

![098cddb04e8eba0215fef116adc88aaf.gif][]

![eb4bd47b6038746bc03cc991225dbeeb.gif][]

配置文件

<?xml version="1.0" encoding="UTF-8"?>
    <beans xmlns="http://www.springframework.org/schema/beans"
           xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
           xmlns:p="http://www.springframework.org/schema/p"
           xmlns:c="http://www.springframework.org/schema/c"
           xsi:schemaLocation="http://www.springframework.org/schema/beans
           http://www.springframework.org/schema/beans/spring-beans.xsd">
        <bean id="dept" class="com.msb.bean.Dept"></bean>
        
        <bean id="emp" class="com.msb.bean.Emp" autowire="byName"></bean>
    </beans>

![5d0c104a08415b2904be9ae3da13ee3d.gif][]

![5dcfa141237921904f75f4d811e5ce34.gif][]

测试代码

package com.msb.test;
    import com.msb.bean.Emp;
    import com.msb.bean.User;
    import org.junit.Test;
    import org.springframework.context.support.ClassPathXmlApplicationContext;
    /**
     * @Author: Ma HaiYang
     * @Description: MircoMessage:Mark_7001
     */
    public class Test2 {
        @Test
        public void testGetBean(){
            ClassPathXmlApplicationContext context =new ClassPathXmlApplicationContext("applicationContext2.xml");
            Emp emp = context.getBean("emp", Emp.class);
            System.out.println(emp);
        }
    }

![b696a9594ef4bd44ddaa73958e7a932a.gif][]

![eac003d4efd2dc5ebeb91dca4bf68ef7.gif][]

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[869ae6fadacd10e6ec09ac09c67f59b4.gif]: https://img-blog.csdnimg.cn/img_convert/869ae6fadacd10e6ec09ac09c67f59b4.gif
[098cddb04e8eba0215fef116adc88aaf.gif]: https://img-blog.csdnimg.cn/img_convert/098cddb04e8eba0215fef116adc88aaf.gif
[eb4bd47b6038746bc03cc991225dbeeb.gif]: https://img-blog.csdnimg.cn/img_convert/eb4bd47b6038746bc03cc991225dbeeb.gif
[5d0c104a08415b2904be9ae3da13ee3d.gif]: https://img-blog.csdnimg.cn/img_convert/5d0c104a08415b2904be9ae3da13ee3d.gif
[5dcfa141237921904f75f4d811e5ce34.gif]: https://img-blog.csdnimg.cn/img_convert/5dcfa141237921904f75f4d811e5ce34.gif
[b696a9594ef4bd44ddaa73958e7a932a.gif]: https://img-blog.csdnimg.cn/img_convert/b696a9594ef4bd44ddaa73958e7a932a.gif
[eac003d4efd2dc5ebeb91dca4bf68ef7.gif]: https://img-blog.csdnimg.cn/img_convert/eac003d4efd2dc5ebeb91dca4bf68ef7.gif