6_Spring_Bean的自动装配

古城微笑少年丶 2023-09-27 15:17 192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 {
    }

![d02b10aa2352c0788c317f1cd8f87878.gif][]

![a38b766a0de2a7ace0a858c9cc800ffe.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;
        }
    }

![3524bacb010b69e603819d3af7b090d2.gif][]

![1a4543c6c5863ac0238120bb4ab07952.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>

![fea54c78b43f829472fc3dab6b5d8a39.gif][]

![8d8524d860c7cc2e1692fbc653500f4f.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);
        }
    }

![da06b154a994cde2f1d0a60e60f04823.gif][]

![cc89017829c60ad671d0f12d4467c530.gif][]

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[a38b766a0de2a7ace0a858c9cc800ffe.gif]: https://img-blog.csdnimg.cn/img_convert/a38b766a0de2a7ace0a858c9cc800ffe.gif
[3524bacb010b69e603819d3af7b090d2.gif]: https://img-blog.csdnimg.cn/img_convert/3524bacb010b69e603819d3af7b090d2.gif
[1a4543c6c5863ac0238120bb4ab07952.gif]: https://img-blog.csdnimg.cn/img_convert/1a4543c6c5863ac0238120bb4ab07952.gif
[fea54c78b43f829472fc3dab6b5d8a39.gif]: https://img-blog.csdnimg.cn/img_convert/fea54c78b43f829472fc3dab6b5d8a39.gif
[8d8524d860c7cc2e1692fbc653500f4f.gif]: https://img-blog.csdnimg.cn/img_convert/8d8524d860c7cc2e1692fbc653500f4f.gif
[da06b154a994cde2f1d0a60e60f04823.gif]: https://img-blog.csdnimg.cn/img_convert/da06b154a994cde2f1d0a60e60f04823.gif
[cc89017829c60ad671d0f12d4467c530.gif]: https://img-blog.csdnimg.cn/img_convert/cc89017829c60ad671d0f12d4467c530.gif