使用注解进行Spring开发的全过程

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

<!--    <bean id="bookDao" class="com.example.dao.impl.BookDaoimpl"/>-->

<!--    扫描组件-->
    <context:component-scan base-package="com.example"/>

</beans>

package com.example.dao.impl;

import com.example.dao.BookDao;
import org.springframework.stereotype.Component;

//组件 (组件名字)
@Component("bookDao")
public class BookDaoimpl implements BookDao {
    public void save(){
        System.out.println("book dao save ...");
    }
}

package com.example.config;

import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;

//配置类
@Configuration
//扫描  (指定包)
@ComponentScan("com.example")
public class SpringConfig {
}

package com.example;

import com.example.config.SpringConfig;
import com.example.dao.BookDao;
import com.example.service.BookService;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;

public class AppForAnnotation {
    public static void main(String[] args) {
        ApplicationContext ctx=new AnnotationConfigApplicationContext(SpringConfig.class);
        BookDao bookDao=(BookDao) ctx.getBean("bookDao");
        System.out.println(bookDao);
        BookService bookService=ctx.getBean(BookService.class);
        System.out.println(bookService);
    }
}