注解模式2

IDao.java

package com.wh.IDao;

public interface IDao {
	boolean insert();

}

OracleDaoImpl.java

package com.wh.dao;

import org.springframework.stereotype.Repository;

import com.wh.IDao.IDao;

@Repository
public class OracleDaoImpl implements IDao{

	@Override
	public boolean insert() {
		return true;
	}

}

MySQLDaoImpl.java

package com.wh.dao;

import com.wh.IDao.IDao;

public class MySQLDaoImpl implements IDao {

	@Override
	public boolean insert() {
		return true;
	}

}

　UserService.java

package com.wh.service;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import com.wh.dao.OracleDaoImpl;

@Service
public class UserService {
	@Resource(name="mySqlDaoImpl")     //@Autowired只适合不是多态的实现，单个类(自动注解)
	private IDao dao;//若属性是接口，且有多个子类实现该接口时，建议使用@Resource(name="xxx")比较好，实现多态的效果

	public boolean insert() {
		return dao.insert();
	}

	public OracleDaoImpl getDao() {
		return dao;
	}

	public void setDao(OracleDaoImpl dao) {
		this.dao = dao;
	}
}

UserController.java

package com.wh.control;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;

import com.wh.service.UserService;

@Controller
public class UserController {
	@Autowired
	private UserService us;

	public boolean requestInsert(){
		return us.insert();
	}

	public UserService getUs() {
		return us;
	}

	public void setUs(UserService us) {
		this.us = us;
	}

}

TestMVC.java　　

package com.wh.test;

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

import com.wh.bean.Student;
import com.wh.control.UserController;

public class TestMVC {

	@Test
	public void testUser2(){
		ApplicationContext ac = new ClassPathXmlApplicationContext("applicationContext.xml");
		UserController c =(UserController)ac.getBean("userController");
		System.out.println(c);
	}

}

applicationContext.xml

package com.wh.test;

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

import com.wh.bean.Student;
import com.wh.control.UserController;

public class TestMVC {

	@Test
	public void testUser2(){
		ApplicationContext ac = new ClassPathXmlApplicationContext("applicationContext.xml");
		UserController c =(UserController)ac.getBean("userController");
		System.out.println(c);
	}

}