Java框架spring 学习笔记（十）：bean管理（注解和配置文件混合使用）

配置文件和注解混合使用

• 创建对象操作使用配置文件方式实现
• 注入属性的操作使用注解方式实现

编写BookDao.java和OrderDao.java文件

BookDao.java

package com.example.spring;

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

OrderDao.java

package com.example.spring;

public class OrderDao {
    public void order(){
        System.out.println("Order Dao.");
    }
}

创建对象操作使用配置文件方式实现

编写配置文件Beans.xml

<?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:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
    http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
    http://www.springframework.org/schema/context
    http://www.springframework.org/schema/context/spring-context-3.0.xsd">

    <!--开启注解扫描，到包里面扫描类、方法、属性上面是否有注解-->
    <context:component-scan base-package="com.example.spring"></context:component-scan>

    <!-- 在配置文件中创建对象 -->
    <bean id="bookService" class="com.example.spring.BookService"></bean>
    <bean id="bookDao" class="com.example.spring.BookDao"></bean>
    <bean id="orderDao" class="com.example.spring.OrderDao"></bean>

</beans>

注入属性的操作使用注解方式实现

编写BookService.java

package com.example.spring;

import javax.annotation.Resource;

public class BookService {
    //注解方式注入属性，得到对象
    @Resource(name = "bookDao")
    private BookDao bookDao;

    @Resource(name = "orderDao")
    private OrderDao orderDao;

    public void service(){
        System.out.println("Book Service.");
        //调用方法
        bookDao.book();
        orderDao.order();
    }
}

编写Application.java

package com.example.spring;

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

public class Application {
    public static void main(String[] args) {
        //bean配置文件所在位置 D:\IdeaProjects\spring\src\Beans.xml
        //使用AbstractApplicationContext容器
        AbstractApplicationContext context = new ClassPathXmlApplicationContext("file:D:\IdeaProjects\spring\src\Beans.xml");
        //得到配置创建的对象
        BookService bookService = (BookService) context.getBean("bookService");
        bookService.service();
    }
}

运行输出

Book Service.
Book Dao.
Order Dao.