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;
    }
}