SpringUtil.java

package test;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.springframework.beans.BeansException;
import org.springframework.context.support.AbstractXmlApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.orm.hibernate4.HibernateTransactionManager;
import org.springframework.orm.hibernate4.SessionFactoryUtils;
import org.springframework.orm.hibernate4.SessionHolder;
import org.springframework.transaction.support.TransactionSynchronizationManager;

public class SpringUtil {
	private static SpringUtil instance;
	protected AbstractXmlApplicationContext ctx;
	// Hibernate
	protected HibernateTransactionManager txManager;
	private Session session;

	private SpringUtil() {
		try {
			ctx = new ClassPathXmlApplicationContext("applicationContext.xml");
		} catch (BeansException e) {
			e.printStackTrace();
			throw e;
		}
	}

	public static SpringUtil getInstance() {
		if (instance == null) {
			instance = new SpringUtil();
		}
		return instance;
	}

	@SuppressWarnings("rawtypes")
	public Object getBean(Class c) {
		if (ctx == null) {
			return null;
		}
		if (session == null) {
			openSession();
		}
		String[] beanNamesForType = ctx.getBeanNamesForType(c);
		if (beanNamesForType == null || beanNamesForType.length == 0) {
			return null;
		}
		String name = beanNamesForType[0];
		Object bean = getBean(name);
		return bean;
	}

	public Object getBean(String name) {
		if (ctx == null) {
			return null;
		}
		if (session == null) {
			openSession();
		}
		Object bean = ctx.getBean(name);
		return bean;
	}

	/**
	 * Deixa a Session viva nesta Thread. Mesma coisa que uma Thread de uma
	 * requisi��o web utilizando o filtro "OpenSessionInViewFilter"
	 */
	public Session openSession() {
		if (ctx != null) {
			txManager = (HibernateTransactionManager) ctx
					.getBean("transactionManager");
			SessionFactory sessionFactory = txManager.getSessionFactory();
			session = sessionFactory.openSession();
			TransactionSynchronizationManager.bindResource(sessionFactory,
					new SessionHolder(session));
		}
		return session;
	}

	/**
	 * Remove a Session da Thread
	 */
	public void closeSession() {
		if (ctx != null && txManager != null) {
			SessionFactory sessionFactory = txManager.getSessionFactory();
			TransactionSynchronizationManager.unbindResource(sessionFactory);
			SessionFactoryUtils.closeSession(session);
			session = null;
		}
	}

	public Session getSession() {
		return session;
	}

	public SessionFactory getSessionFactory() {
		SessionFactory sf = txManager.getSessionFactory();
		return sf;
	}
}