Spring的bean管理--注解和配置文件混合使用

使用注解除了Spring的四个核心包和日志包，还需要导入aop包，注解可以使用在类上面，方法上面和属性上面，在xml文件中还需要引入新的约束--context

创建对象的四个注解：

1.@Component

2.@Controller      web层

3.@Service　　   业务层

4.@Repository     持久层

注入属性注解：

1.@Autowired

2.@Resource(name=" ")

注解和配置文件混合使用

创建对象操作使用配置文件方式实现

注入属性操作使用注解方式实现

bean2.xml:

<?xml version="1.0" encoding="UTF-8"?>
<beans
    xmlns="http://www.springframework.org/schema/beans"
    xmlns:context="http://www.springframework.org/schema/context"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    
    xmlns:p="http://www.springframework.org/schema/p"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsd
         http://www.springframework.org/schema/context
 
           http://www.springframework.org/schema/context/spring-context-3.1.xsd">
        <!-- 开启注解扫描 
            到包里面扫面类、方法、属性上面是否有注解
        -->
        <context:component-scan base-package="com.spring"></context:component-scan>
        <!-- 配置对象 -->
        <bean id="bookService" class="com.spring.xmlano.BookService"></bean>
        <bean id="bookDao" class="com.spring.xmlano.BookDao"></bean>
        <bean id="ordersDao" class="com.spring.xmlano.OrdersDao"></bean>
</beans>

BookService.java

package com.spring.xmlano;

import javax.annotation.Resource;

public class BookService {
    
    //得到bookdao和orderdao的对象
    @Resource(name="bookDao")
    private BookDao bookDao;
    
    @Resource(name="ordersDao")
    private OrdersDao ordersDao;
            public void add(){
                System.out.println("service......");
                bookDao.book();
                ordersDao.buy();
            }
}

BookDao.java

package com.spring.xmlano;

public class BookDao {
        public void book(){
            System.out.println("book...");
        }
}

OrdersDao.java

package com.spring.xmlano;

public class OrdersDao {
    public void buy(){
        System.out.println("orderdao......");
    }

}

Test.java

package com.spring.xmlano;

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

public class Test {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        ApplicationContext context=
                new ClassPathXmlApplicationContext("bean2.xml");
        BookService bookservice = (BookService) context.getBean("bookService");
        bookservice.add();

    }

}