userserviceimpl.java

本程序所写的排课

package com.briup.service.impl;

import static com.briup.common.BeanFactory.getBean;
import static com.briup.common.HibernateSessionFactory.getSession;

import org.hibernate.Session;
import org.hibernate.Transaction;

import com.briup.bean.Student;
import com.briup.bean.User;
import com.briup.common.BeanFactory;
import com.briup.common.exception.UserServiceException;
import com.briup.dao.impl.UserDaoImpl;
import com.briup.service.IUserService;

public class UserServiceImpl implements IUserService{

	public User login(String username, String password) throws UserServiceException{
		
		UserDaoImpl userDao = (UserDaoImpl)getBean(BeanFactory.USERDAOIMPL);
		User user = null;
		try
		{
			user = userDao.findUser(username, password);
		}
		catch(Exception e)
		{
			e.printStackTrace();
			System.out.println(user);
			throw new UserServiceException("用户名不存在！！");
		}
		
		return user;
	}

	public void register(Student student, User user) throws UserServiceException{
		
		//注意这里的Transaction事务必须第一个开始， 否则会出错
		Session session = getSession();
		Transaction trans = session.beginTransaction();
		UserDaoImpl userDao = (UserDaoImpl)getBean(BeanFactory.USERDAOIMPL);
		try
		{
			User u = userDao.findUser(user.getUsername());
			if(u != null)
			{
				throw new UserServiceException("账户已经存在！");
			}
			userDao.saveUser(user);
			userDao.saveStudent(student);
			trans.commit();
		}
		catch(Exception e)
		{
			e.printStackTrace();
			trans.rollback();
			throw (UserServiceException)e;
		}	
		session.close();
	}

	public void update(Student student, User user) {
		
		Session session = getSession();
		Transaction trans = session.beginTransaction();
		UserDaoImpl userDao = (UserDaoImpl)getBean(BeanFactory.USERDAOIMPL);
		try
		{
			userDao.saveUser(user);
			userDao.saveStudent(student);
			trans.commit();
		}
		catch(Exception e)
		{
			e.printStackTrace();
			trans.rollback();
		}
		session.close();
	}

	public void saveStudent(Student student) {
		
		Session session = getSession();
		Transaction trans = session.beginTransaction();
		UserDaoImpl userDao = (UserDaoImpl)getBean(BeanFactory.USERDAOIMPL);
		try {
			userDao.saveStudent(student);
			trans.commit();
		} catch (Exception e) {
		
			e.printStackTrace();
			trans.rollback();
		}
		session.close();
	}
}