Hibernate的工具类HibernateUtils

贡献一个通用的Hibernate的工具类：HibernateUtils

package com.hibernate.utils;import java.io.Serializable;import org.hibernate.Session;import org.hibernate.SessionFactory;import org.hibernate.Transaction;import org.hibernate.cfg.AnnotationConfiguration;public class HibernateUtils {private static SessionFactory sessionFactory;private HibernateUtils() {}static {/** * configure()参数为空默认查找classes目录下hibernate.cfg.xml * configure("文件名")也有重载方法，参数名为配置文件名 */sessionFactory = new AnnotationConfiguration().configure().buildSessionFactory();}public static SessionFactory getSessionFactory() {return sessionFactory;}/** * 如果想使用sessionFactory.getCurrentSession()来获得Session时，需要在配置文件中添加一句： * <!-- 本地事务 防止使用sessionFactory.getCurrentSession()时报错："org.hibernate.HibernateException: No CurrentSessionContext configured!"-->  * <property name="hibernate.current_session_context_class">thread</property> * @return */public static Session getCurrentSession() {return sessionFactory.getCurrentSession();}public static Session getNewSession() {return sessionFactory.openSession();}public static void add(Object entity) {Session s = null;Transaction tx = null;try {s = HibernateUtils.getNewSession();tx = s.beginTransaction();s.save(entity);tx.commit();} finally {if (s != null)s.close();}}public static void update(Object entity) {Session s = null;Transaction tx = null;try {s = HibernateUtils.getNewSession();tx = s.beginTransaction();s.update(entity);tx.commit();} finally {if (s != null)s.close();}}public static void delete(Object entity) {Session s = null;Transaction tx = null;try {s = HibernateUtils.getNewSession();tx = s.beginTransaction();s.delete(entity);tx.commit();} finally {if (s != null)s.close();}}public static Object get(Class clazz, Serializable id) {Session s = null;try {s = HibernateUtils.getNewSession();Object obj = s.get(clazz, id);return obj;} finally {if (s != null)s.close();}}}

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