Spring

时间：2021-05-17 22:19:29 阅读：18 评论：0 收藏：0 [点我收藏+]

1，服务器端的三层体系架构，分别为表示层(Web)、业务逻辑层(Service)、持久层(Dao)

2，spring 基础包 spring-core spring-beans spring-context spring-expression

3，spring 的 IOC控制反转和 DI依赖注入

4，spring 入门程序

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-4.3.xsd">

    <!--package ioc-->
    <bean id="userDao" class="ioc.UserDaoImpl" />

</beans>



UserDao.java

package ioc;

public interface UserDao {
    public void say();
}



UserDaoImpl.java

package ioc;

public class UserDaoImpl implements UserDao {
    @Override
    public void say() {
        System.out.println("userDao say hello World !");
    }
}




TestIoC.java

package ioc;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class TestIoC {

    public static void main(String[] args) {
        ApplicationContext applicationContext = new ClassPathXmlApplicationContext("applicationContext.xml");
        UserDao userDao = (UserDao)applicationContext.getBean("userDao");
        userDao.say();
    }

}