1、创建工程，导入坐标

1.1 创建工程

1.2 导入坐标

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">

4.0.0

org.example

spring_01_ioc_xml

1.0-SNAPSHOT

jar

org.springframework

spring-context

5.0.2.RELEASE

2、创建三层对象

2.1 controller

public class UserController {

public static void main(String[] args) {

ApplicationContext ac = new ClassPathXmlApplicationContext("applicationContext.xml");

UserService userService = ac.getBean("userService", UserService.class);

userService.saveUser();

}

}

2.2 service

1)UserService

public interface UserService {

/**

* 模拟保存用户

*/

void saveUser();

}

2)UserServiceImpl

public class UserServiceImpl implements UserService {

private UserDao userDao;

public void setUserDao(UserDao userDao) {

this.userDao = userDao;

}

public void saveUser() {

userDao.saveUser();

}

}

2.3 dao

1)UserDao

public interface UserDao {

/**

* 模拟保存用户

*/

void saveUser();

}

2)UserDaoImpl

public class UserDaoImpl implements UserDao {

public void saveUser() {

System.out.printf("用户保存成功！");

}

}

3、Spring配置文件

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">

4、测试结果

用户保存成功！

Process finished with exit code 0