spring中的ioc解决程序的耦合入门

1、导入环境

maven导入

<dependencies>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-context</artifactId>
        <version>5.x.x</version>
    </dependency>
</dependencies>

开发包下载地址： http://repo.springsource.org/libs-release-local/org/springframework/spring 需要注意的是spring5版本是基于jdk8编写的所以使用spring5，jdk的版本必须是jdk8以上的版本。

2、接口及其实现类的创建

实例项目结构 dao层

public interface AccountDao {
          
   
    void save();
}

public class AccountDaoImpl implements AccountDao {
          
   
    @Override
    public void save() {
          
   
        System.out.println("账户已保存！！！");
    }
}

service层

public interface AccountService {
          
   
    void save();
}

public class AccountServiceImpl implements AccountService {
          
   

    @Override
    public void save() {
          
   
    }
}

ui层

public class Client {
          
   
    
    public static void main(String[] args) {
          
   
        //1.获取核心容器对象
        ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("bean.xml");
        //2. 获取对象
        AccountDaoImpl accountDao = context.getBean("accountDao", AccountDaoImpl.class);
        AccountServiceImpl accountService = context.getBean("accountService", AccountServiceImpl.class);
        
        System.out.println(accountDao);
        System.out.println(accountService);
    }

}

容器xml配置文件

<?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">

    <!--把对象交给spring管理-->
    <bean id="accountService" class="com.yzx.service.impl.AccountServiceImpl"></bean>

    <bean id="accountDao" class="com.yzx.dao.impl.AccountDaoImpl"></bean>

</beans>

3、运行测试

运行Client类的main方法，发现对象已被创建。