Hibernate中获取Session的两种方式代码示例

package com.bjpowernode.usermgr.util;
import org.hibernate.Session;
//hibernate3的 
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
public class HibernateUtils {
	private static SessionFactory factory;
	static{
		try{
			//读取hibernate.cfg.xml文件 
			Configuration cfg=new Configuration().configure();
			//建立SessionFactory 
			factory=cfg.buildSessionFactory();
		}
		catch(Exception e){
			e.printStackTrace();
		}
	}
	//获得开启着的Session 
	public static Session getSession(){
		return factory.openSession();
	}
	//关闭Session 
	public static void closeSession(Session session){
		if(session!=null){
			if(session.isOpen()){
				session.close();
			}
		}
	}
	public static SessionFactory getSessionFactory(){
		return factory;
	}
}

package com.bjpowernode.usermgr.manager;
import java.util.Date;
import org.hibernate.Session;
import com.bjpowernode.usermgr.domain.Log;
import com.bjpowernode.usermgr.domain.User;
import com.bjpowernode.usermgr.util.HibernateUtils;
public class UserManagerImpl implements UserManager {
	/** 
  * 添加用户和添加日志都使用了同一个Session，所以 
  * 当用户添加失败的时候，日志也会添加失败。事务回滚 
  * 用户添加成功日志也会添加成功 
  */
	public void addUser(User user) {
		Session session=null;
		try{
			//取得当前线程Session 
			session=HibernateUtils.getSessionFactory().getCurrentSession();
			session.beginTransaction();
			//保存用户 
			session.save(user);
			Log log=new Log();
			log.setType("操作日志");
			log.setTime(new Date());
			log.setDetail("XXX");
			LogManager logManager=new LogManagerImpl();
			//保存日志 
			logManager.addLog(log);
			session.getTransaction().commit();
		}
		catch(Exception e){
			e.printStackTrace();
			session.getTransaction().rollback();
		}
	}
}

package com.bjpowernode.usermgr.manager;
import org.hibernate.Session;
import com.bjpowernode.usermgr.domain.Log;
import com.bjpowernode.usermgr.util.HibernateUtils;
public class LogManagerImpl implements LogManager {
	public void addLog(Log log) {
		//获取当前线程的Session 
		HibernateUtils.getSessionFactory().getCurrentSession().save(log);
	}
}

package com.bjpowernode.usermgr.manager;
import junit.framework.TestCase;
import com.bjpowernode.usermgr.domain.User;
public class UserManagerImplTest extends TestCase {
	public void testAddUser() {
		UserManager userManager=new UserManagerImpl();
		User user=new User();

  user.setName("张三"); 
  userManager.addUser(user); 
}