spring mvc 之 manager dao

spring 注入manager ，dao：

	<context:annotation-config/>
	<context:component-scan base-package="com.longxia.**.manager" />
	<context:component-scan base-package="com.longxia.**.dao" />

编写manager (package com.longxia.springmvc.manager.usermanager)

IUserManager.java

public interface IUserManager {
	
	public void findUserByUserName(String userName);

UserManagerImpl.java

@Service
public class UserManagerImpl implements IUserManager {
	
	private static final Logger logger = LoggerFactory.getLogger(UserManagerImpl.class);
	
	@Autowired
	private IUserDao userDao;
	
	@Autowired
	private IManagerUserDao managerUserDao;

IUserDao.java

package com.longxia.springmvc.dao.userdao;

import java.util.List;

import com.longxia.springmvc.dao.IHibernateBaseDao;
import com.longxia.springmvc.model.User;

/**
 * @author xialong
 *
 */
public interface IUserDao extends IHibernateBaseDao<User>{
	
	public List<User> findAllUsers();
}

UserDaoImpl.java

package com.longxia.springmvc.dao.userdao;

import java.util.List;

import javax.annotation.PostConstruct;
import javax.annotation.Resource;

import org.hibernate.SessionFactory;
import org.springframework.stereotype.Component;

import com.longxia.springmvc.dao.HibernateBaseDao;
import com.longxia.springmvc.model.User;

/**
 * @author xialong
 *
 */
@Component
public class UserDaoImpl extends HibernateBaseDao<User> implements IUserDao {
	@Resource
	private SessionFactory springmvcSessionFactory;
	@PostConstruct
	public void initSessionFactory() {
		super.setSessionFactory(springmvcSessionFactory);
	}
	/* (non-Javadoc)
	 * @see com.longxia.springmvc.dao.userdao.IUserDao#findAllUsers()
	 */
	@Override
	public List<User> findAllUsers() {
		String hql = "from User";
		return this.getHibernateTemplate().find(hql);
	}
	
}

题外话：

@Component；@Controller；@Service；@Repository

在annotaion配置注解中用@Component来表示一个通用注释用于说明一个类是一个spring容器管理的类。即就是该类已经拉入到spring的管理中了。而@Controller, @Service, @Repository是@Component的细化，这三个注解比@Component带有更多的语义，它们分别对应了控制层、服务层、持久层的类。

@Repository标签是用来给持久层的类定义一个名字，让Spring根据这个名字关联到这个类。

@Service是用于服务层的IServiceImpl类文件，功能与@Repository类似。

另外标签：＠Autowired 用来注入。