1.配置

<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans-4.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">
    <context:component-scan base-package="spring"/>
</beans>
 

開啟註解掃描，掃描屬性方法類上的註解，spring容器會根據包的名稱去找到相應的類並建立物件的例項。

2.編寫類和方法

@Service("userService")
public class UserService {
    public void add(){
        System.out.println("UserService...");
    }
}

@Controller("userController")
public class UserController {
	@Autowired
	private UserService userService;
	
	public void add(){
	   	userService.add();
	}
}
 

3.測試

public static void main(String[] args) {
	ApplicationContext applicationContext = new ClassPathXmlApplicationContext("spring/applicationContext.xml");
	UserController userController = (UserController)applicationContext.getBean("userController");
	userController.add();
}