Spring-IOC实现【02-XML配置方式案例】

public interface IUserDao {
	public String add();
}

public class UserDaoImpl implements IUserDao {

	@Override
	public String add() {
		// TODO Auto-generated method stub
		return "hello ... ";
	}
}

public interface IUserService {
	public String add();
}

public class UserServiceImpl implements IUserService {

	private IUserDao dao; 
	// 设值注入 必须的方法
	public void setDao(IUserDao dao) {
		this.dao = dao;
	}

	@Override
	public String add() {
		return dao.add();
	}
}

/**
 * 控制层
 * @author dpb
 *
 */
public class UserController {
	
	private IUserService service;
	
	// 设值注入必须的方法
	public void setService(IUserService service) {
		this.service = service;
	}
	public String add(){
		return service.add();
	}
}

<!-- 配置 dao -->
<bean class="com.sxt.dao.impl.UserDaoImpl" id="userDaoImpl"/>

<!-- 配置 service -->
<bean class="com.sxt.service.impl.UserServiceImpl" id="userServiceImpl">
	<!-- 设值注入 dao对象 -->
	<property name="dao" ref="userDaoImpl"></property>
</bean>

<!-- 配置controller -->
<bean class="com.sxt.controller.UserController">
	<!-- 设值注入service对象 -->
	<property name="service" ref="userServiceImpl"></property>
</bean>

@Test
public void test2() {
	// 获取ApplicationContext对象 加载配置文件 反射+xml解析
	ApplicationContext ac = new ClassPathXmlApplicationContext("application.xml");
	UserController bean = ac.getBean(UserController.class);
	System.out.println(bean.add());
}