userpersistlocal.java

struts2+ejb3.0+mysql+jboss+myeclipse的登录模块

package com.ouyang.ejb3.lifecycle;

import javax.ejb.Stateless;
import javax.persistence.EntityManager;
import javax.persistence.EntityNotFoundException;
import javax.persistence.NonUniqueResultException;
import javax.persistence.PersistenceContext;
import javax.persistence.Query;

import com.ouyang.ejb3.entity.User;

@Stateless
public class UserPersistLocal implements UserPersist {
	@PersistenceContext
	private EntityManager em;

	public boolean findUserByUerName(String userName) {
		User user = null;
		try {
			Query query = em
					.createQuery("FROM User user WHERE user.userName=:userName");
			query.setParameter("userName", userName);
			user = (User) query.getSingleResult();
		} catch (EntityNotFoundException notFound) {
		} catch (NonUniqueResultException nonUnique){
		} finally{
			if(user==null)				
				return false;
		}
		return true;
	}

	public User findUserByUser(User user) {
		User user2 = null;
		try {
			Query query = em.createQuery("FROM User user WHERE user.userName=:userName AND " +
					      "user.userPassword=:userPassword");	
			query.setParameter("userName", user.getUserName());
			query.setParameter("userPassword", user.getUserPassword());
			user2 = (User) query.getSingleResult();
		} finally{
			if(user2==null)				
				return null;
		}
		return user2;
	}

	public void addUserByUser(User user) {
		em.persist(user);
	}

}