浅谈Spring6之自动（装配）注入byName和byType

自动注入（自动装配）byName

byName需要给属性提供set方法

Dao

Service

SpringConfig.xml配置

<!--dao-->
<!--   (id不能随便写,写set方法名称)-->
    <bean id="orderDao" class="com.spring6.dao.OrderDao"></bean>
<!--service-->
<!--    根据名字自动装配-->
    <bean id="orderService" class="com.spring6.service.OrderService" autowire="byName">
    </bean>

测试类
//auto
    @Test
    public void aotuWire(){
        ApplicationContext aotu = new ClassPathXmlApplicationContext("springConfig.xml");
        OrderService orderService = aotu.getBean("orderService", OrderService.class);
        orderService.generate();

    }

自动注入（自动装配）byType

自动装配是基于set方法的，根据类型进行自动装配的时候，在有效的配置文件当中，某种类型的实例只能有一个。

Dao

Service

public class CustomerService {

    private UserDao userDao;
    private testDao testdao;

    public void setUserDao(UserDao userDao) {
        this.userDao = userDao;
    }

    public void setTestdao(testDao testdao) {
        this.testdao = testdao;
    }

    public void saveUser(){
        userDao.insert();
        testdao.insert();
    }
}

SpringConfig.xml

<!--根据类型自动装配-->
<!--    dao-->
    <bean class="com.spring6.dao.UserDao"></bean>
    <bean class="com.spring6.dao.testDao"></bean>
<!--    service-->
<bean id="cser" class="com.spring6.service.CustomerService" autowire="byType"></bean>

测试类

@Test
    public void aotuWire(){
        ApplicationContext auto = new ClassPathXmlApplicationContext("springConfig.xml");
        CustomerService cser = auto.getBean("cser", CustomerService.class);
        cser.saveUser();
    }