01Spring基於xml的IOC配置

1、創建一個普通的maven工程

1.1 選擇maven，不用骨架，點擊下一步。

1.2 填寫GroupId、ArtifactId、Version。填完點擊下一步

1.3 確認項目路徑，確認完成點擊finish

2、模擬三層創建包和類

2.1 創建service介面

package com.yuank.service;  
  
public interface IAccountService {  
    /** 
     * 模擬保存賬戶 
     */  
    void saveAccount();  
}  

2.2 創建service介面的實現類

package com.yuank.service.impl;  
  
import com.yuank.dao.IAccountDao;  
import com.yuank.dao.impl.AccountDaoImpl;  
import com.yuank.service.IAccountService;  
  
/** 
 * @author PC-Black 
 * @version v1.0 
 * @date 2019/7/21 21:33 
 * @description TODO 
 **/  
public class AccountServiceImpl implements IAccountService {  
    //手動初始化  
    private IAccountDao accountDao = new AccountDaoImpl();  
  
    public void saveAccount() {  
        accountDao.saveAccount();  
    }  
} 

2.3 創建dao持久層介面

package com.yuank.dao;  
  
public interface IAccountDao {  
    void saveAccount();  
}  

2.4 創建dao持久層實現類

package com.yuank.dao.impl;  
  
import com.yuank.dao.IAccountDao;  
  
/** 
 * @author PC-Black 
 * @version v1.0 
 * @date 2019/7/21 21:38 
 * @description TODO 
 **/  
public class AccountDaoImpl implements IAccountDao {  
  
    public void saveAccount() {  
        System.out.println("保存賬戶");  
    }  
}

2.5 創建web表現層

import com.yuank.service.IAccountService;  
import com.yuank.service.impl.AccountServiceImpl;  
/** 
 * @author PC-Black 
 * @version v1.0 
 * @date 2019/7/21 21:39 
 * @description TODO 
 **/  
public class Client {  
    public static void main(String[] args) {  
        IAccountService accountService = new AccountServiceImpl();  
        accountService.saveAccount();  
    }  
}

2.6 測試運行

3、創建配置文件

3.1 在resources下創建：applicationContext.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"  
       xsi:schemaLocation="http://www.springframework.org/schema/beans  
http://www.springframework.org/schema/beans/spring-beans.xsd">  
  
  
  
</beans>  

3.2 在pom文件中添加依賴，解決配置文件約束報紅

<dependencies>  
    <!--IOC相關依賴-->  
    <dependency>  
        <groupId>org.springframework</groupId>  
        <artifactId>spring-context</artifactId>  
        <version>5.0.6.RELEASE</version>  
    </dependency>  
</dependencies>  

3.3 通過spring的IOC來創建對象

<!--  
    1. spring會通過反射的方式創建對象，並將該對象以key和value的方式存入到IOC容器中。  
    2. bean標簽的id就是key，value就是類的全路徑  
    3. 通過bean標簽將對象創建並存入到IOC容器的方式，我們可以稱之為裝配bean  
    4. 只要可以正常new出來的對象，都可以通過這種方式裝配到IOC容器中  
-->  
  
<!--將service實現類裝配到IOC容器中-->  
<bean id="accountService" class="com.yuank.service.impl.AccountServiceImpl"/>  
  
<!-- 將dao實現類裝配到IOC容器中 -->  
<bean id="accountDao" class="com.yuank.dao.impl.AccountDaoImpl"/> 

3.4 載入applicationContext.xml配置文件&從spring的IOC容器中獲取對象

package com.yuank.web;  
  
import com.yuank.dao.IAccountDao;  
import com.yuank.service.IAccountService;  
import org.springframework.context.ApplicationContext;  
import org.springframework.context.support.ClassPathXmlApplicationContext;  
  
/**  
 * @author PC-Black  
 * @version v1.0  
 * @date 2019/7/21 21:39  
 * @description TODO  
 **/  
public class Client {  
    public static void main(String[] args) {  
//        IAccountService accountService = new AccountServiceImpl();  
  
        //1. 載入配置文件  
        ApplicationContext ac = new ClassPathXmlApplicationContext("applicationContext.xml");  
        //2. 從容器中獲取service  
        IAccountService accountService = (IAccountService) ac.getBean("accountService");  
        //2.1 列印accountService對象  
        System.out.println(accountService);  
        //3. 從容器中獲取dao  
        IAccountDao accountDao = (IAccountDao) ac.getBean("accountDao");  
        //3.1 列印accountDao對象  
        System.out.println(accountDao);  
  
        accountService.saveAccount();  
  
  
    }  
} 

3.5 運行main方法

查看控制台，我們發現對象創建成功