Spring6梳理9—— 依赖注入之外部注入对象类型属性

news2024/9/22 21:50:46

9.1 依赖注入之外部注入对象类型属性

9.1.1 创建dept与emp类

1.dept类

package com.atguigu.spring6.iocxml.ditest;


//部门类
public class Dept {
    private String dname;

    public String getDname() {
        return dname;
    }

    public void setDname(String dname) {
        this.dname = dname;
    }

    public void info() {
        System.out.println("部门名称是:"+dname);
    }
}

2.emp类

package com.atguigu.spring6.iocxml.ditest;
//员工类
public class Emp {
    private Dept dept;
    private String ename;
    private Integer age;

    public Dept getDept() {
        return dept;
    }

    public void setDept(Dept dept) {
        this.dept = dept;
    }

    public String getEname() {
        return ename;
    }

    public void setEname(String ename) {
        this.ename = ename;
    }

    public Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }

    public void work() {
        System.out.println(ename + "工作到了" + age);
        dept.info();
    }
}

由于一个部门有多个员工，因此部门与员工的关系为一对多，所以将唯一的Dept作为引用的bean，外键为

9.1.2 创建配置文件

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">

    <bean id="dept" class="com.atguigu.spring6.iocxml.ditest.Dept">
        <property name="dname" value="安保部"></property>
    </bean>
    <bean id="emp" class="com.atguigu.spring6.iocxml.ditest.Emp">
        <property name="ename" value="lucy"></property>
        <property name="age" value="50"></property>
    <!--注入对象类型属性
       private Dept dept;
    -->
        <property name="dept" ref="dept"></property>
    </bean>
</beans>

9.1.3 创建测试类

package com.atguigu.spring6.iocxml.ditest;

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

/**
 * @package: com.atguigu.spring6.iocxml.ditest
 * @className: TestEmp
 * @Description:
 * @author: haozihua
 * @date: 2024/9/18 11:10
 */
public class TestEmp {
    public static void main(String[] args) {
        ApplicationContext context
                = new ClassPathXmlApplicationContext("bean-ref.xml");
        Emp emp = context.getBean("emp", Emp.class);
        emp.work();
    }
}