Spring基于xml自动装配

package com.Keafmd.spring5.autowire;
/**
 * Keafmd
 *
 * @ClassName: Dept
 * @Description: 部门类
 * @author: 牛哄哄的柯南
 * @date: 2021-01-16 13:43
 */
public class Dept {
    @Override
    public String toString() {
        return "Dept{}";
    }
}

package com.Keafmd.spring5.autowire;
/**
 * Keafmd
 *
 * @ClassName: Emp
 * @Description: 员工类
 * @author: 牛哄哄的柯南
 * @date: 2021-01-16 13:42
 */
public class Emp {
    private Dept dept; // id和这里保持一致
    public void setDept(Dept dept) {
        this.dept = dept;
    }
    @Override
    public String toString() {
        return "Emp{" +
                "dept=" + dept +
                '}';
    }
    public void test(){
        System.out.println(dept);
    }
}

<?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="emp" class="com.Keafmd.spring5.autowire.Emp">
        <!--手动装配-->
        <property name="dept" ref="dept"></property>
    </bean>
    <bean id="dept" class="com.Keafmd.spring5.autowire.Dept"></bean>
</beans>

package com.Keafmd.spring5.testdemo;
import com.Keafmd.spring5.autowire.Emp;
import com.Keafmd.spring5.bean.Orders;
import com.Keafmd.spring5.collectiontype.Book;
import com.Keafmd.spring5.collectiontype.Course;
import com.Keafmd.spring5.collectiontype.Stu;
import com.Keafmd.spring5.factorybean.MyBean;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
/**
 * Keafmd
 *
 * @ClassName: TestSpring5demo1
 * @Description: 测试类
 * @author: 牛哄哄的柯南
 * @date: 2021-01-15 14:30
 */
public class TestSpring5demo1 {
    @Test
    public void test5(){
        ApplicationContext context = new ClassPathXmlApplicationContext("bean5.xml");
        Emp emp = context.getBean("emp",Emp.class);
        System.out.println(emp);
    }
}

Emp{dept=Dept{}}
Process finished with exit code 0

<?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">
    <!--自动装配
    bean标签属性 autowire ，配置自动装配
    autowire属性常用的两个值：
    byName 根据属性名称自动注入 ，要注入的那个值bean的id值要和类里面属性名称一样
    byType：根据属性类型自动注入
    -->
    <bean id="emp" class="com.Keafmd.spring5.autowire.Emp" autowire="byType">
        <!--手动装配-->
<!--        <property name="dept" ref="dept"></property>-->
    </bean>
    <bean id="dept" class="com.Keafmd.spring5.autowire.Dept"></bean>
    <!--根据属性类型注入，多写这行就会报错，类型匹配到了两个bean,byName不会错-->
<!--    <bean id="dept1" class="com.Keafmd.spring5.autowire.Dept"></bean>-->
</beans>

package com.Keafmd.spring5.testdemo;
import com.Keafmd.spring5.autowire.Emp;
import com.Keafmd.spring5.bean.Orders;
import com.Keafmd.spring5.collectiontype.Book;
import com.Keafmd.spring5.collectiontype.Course;
import com.Keafmd.spring5.collectiontype.Stu;
import com.Keafmd.spring5.factorybean.MyBean;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
/**
 * Keafmd
 *
 * @ClassName: TestSpring5demo1
 * @Description: 测试类
 * @author: 牛哄哄的柯南
 * @date: 2021-01-15 14:30
 */
public class TestSpring5demo1 {
    @Test
    public void test5(){
        ApplicationContext context = new ClassPathXmlApplicationContext("bean5.xml");
        Emp emp = context.getBean("emp",Emp.class);
        System.out.println(emp);
    }
}

Emp{dept=Dept{}}
Process finished with exit code 0