黑马程序员SSM框架教程

一、创建一个项目

1.1 新建项目

1.2 创建dao和service包，项目结构如下

1.3 代码

1. BookDao

package com.itheima.dao;

public interface BookDao {
    public void save();
}

2. BookDaoImpl

package com.itheima.dao.impl;

import com.itheima.dao.BookDao;

public class BookDaoImpl implements BookDao {
    public void save(){
        System.out.println("book dao save...");
    }
}

3. BookService

package com.itheima.service;

public interface BookService {
    public void save();
}

4. BookServiceImpl

package com.itheima.service.impl;

import com.itheima.dao.BookDao;
import com.itheima.dao.impl.BookDaoImpl;
import com.itheima.service.BookService;

public class BookServiceImpl implements BookService {
    private BookDao bookDao =new BookDaoImpl();
    public void save(){
        System.out.println("book service save...");
        bookDao.save();
    }
}

5. Main

package com.itheima;

import com.itheima.service.BookService;
import com.itheima.service.impl.BookServiceImpl;

//TIP To <b>Run</b> code, press <shortcut actionId="Run"/> or
// click the <icon src="AllIcons.Actions.Execute"/> icon in the gutter.
public class Main {
    public static void main(String[] args) {
        BookService bookService=new BookServiceImpl();
        bookService.save();
    }
}

1.4 运行结果

运行main的结果

二、将service和dao交给IoC容器管理

2.1 导入Spring的坐标spring-context，对应版本是5.2.10.RELEASE

<dependencies>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>5.2.10.RELEASE</version>
        </dependency>
    </dependencies>

2.2 2. 配置bean

1. 在resources包上右键
   
   

<!--    2. 配置bean-->
 <!--   bean标签表示配置bean
    id属性表示给bean起名字
    class属性表示给bean定义类型-->
    <bean id="bookDao" class="com.itheima.dao.impl.BookDaoImpl"/>
    <bean id="bookService" class="com.itheima.service.impl.BookServiceImpl"/>

2.3 获取IoC容器（在main方法中）

//3. 获取IoC容器
        ApplicationContext applicationContext=new ClassPathXmlApplicationContext("applicationContext.xml");

2.4 获取bean（在main方法中）

//4. 获取bean
        BookService bookService = (BookService) applicationContext.getBean("bookService");
        bookService.save();