spring程序开发步骤

1.使用spring框架之前的开发步骤

2.使用spring之后的开发步骤

3.文字描述
1.导入Spring开发的基本依赖
2.编写Dao接口和实现类
3.创建spring核心配置文件
4.在spring配置文件中配置UserDaoImpl
5.使用Spring API获得Bean实例

1.导入Spring开发的基本依赖

 <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-context</artifactId>
      <version>5.2.9.RELEASE</version>
    </dependency>

2.编写Dao接口和实现类

public interface UserDao {
    public void save();
}

public class UserDaoImpl implements UserDao {

    @Override
    public void save() {
        System.out.println("save running...");
    }
}

3.创建spring核心配置文件

<?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">

</beans>

4.在spring配置文件中配置UserDaoImpl

<?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">
    <bean id="userDao" class="com.hao.dao.impl.UserDaoImpl"></bean>
    
</beans>

5.使用Spring API获得Bean实例

public class UserDaoDemo {
    public static void main(String[] args) {
        //获取对象
        ApplicationContext app=new ClassPathXmlApplicationContext("applicationContext.xml");
        UserDao userDao = (UserDao) app.getBean("userDao");
        userDao.save();
    }
}