将CRUD封装到一个工具类中

 package org.zln.hibernate.utils;

 import org.hibernate.Session;
 import org.hibernate.SessionFactory;
 import org.hibernate.Transaction;
 import org.hibernate.cfg.Configuration;

 import java.io.Serializable;

 /**
  * Created by coolkid on 2015/6/14 0014.
  */
 public final class HibernateUtils {

     private static Configuration configuration = new Configuration();
     private static SessionFactory sessionFactory;
     private static final String PATH = "hibernate.cfg.xml";

     private HibernateUtils(){}

     static {
         /*初始化Hibernate*/
         configuration.configure(PATH);
         sessionFactory = configuration.buildSessionFactory();
     }

     public static SessionFactory getSessionFactory(){
         return sessionFactory;
     }

     public static Session getSession(){
         return sessionFactory.openSession();
     }

     public static void add(Object o){
         Session session = null;
         Transaction transaction = null;
         try {
             session = HibernateUtils.getSession();
             transaction = session.beginTransaction();
             session.save(o);
             session.flush();
             transaction.commit();
         }finally {
             if (session != null){
                 session.close();
             }
         }
     }

     public static void update(Object o){
         Session session = null;
         Transaction transaction = null;
         try {
             session = HibernateUtils.getSession();
             transaction = session.beginTransaction();
             session.update(o);
             transaction.commit();
         }finally {
             if (session != null){
                 session.close();
             }
         }
     }

     public static void delete(Object o){
         Session session = null;
         Transaction transaction = null;
         try {
             session = HibernateUtils.getSession();
             transaction = session.beginTransaction();
             session.delete(o);
             transaction.commit();
         }finally {
             if (session != null){
                 session.close();
             }
         }
     }

     public static Object getObject(Class clazz,Serializable id){
         Object o = null;
         Session session = null;
         try {
             session = HibernateUtils.getSession();
             o = session.get(clazz,id);
         }finally {
             if (session!=null){
                 session.close();
             }
         }
         return o;
     }
 }