单例模式的SessionFactory以及线程安全的session

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

public class HibernateUtil {
    private static final ThreadLocal<Session> lock = new ThreadLocal<Session>();
    
    private static final SessionFactory factory = buildFactory();
    private static SessionFactory buildFactory() {
        Configuration cfg = new Configuration().configure();
        return cfg.buildSessionFactory();
    }
    
    public static Session getSession() {
        Session session = lock.get();
        
        if (session == null) {
            session = factory.openSession();
            lock.set(session);
        }
        
        return session;
    }
    public static void closeSession() {   
        Session session = lock.get();
        
        if (session != null) {
            session.close();
            lock.set(null);    
        }
    }
    
}

配置

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC
    "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
    "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
    <hibernate-configuration>
        <session-factory>
            <!-- 指定方言 -->
            <property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
             <!-- 数据库驱动 -->
            <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
             <!-- 数据库url -->
            <property name="hibernate.connection.url">jdbc:mysql://localhost:3306/hibernate02_1514010311</property>
             <!-- 数据库连接用户名 -->
            <property name="hibernate.connection.username">root</property>
             <!-- 数据库连接密码 -->
            <property name="hibernate.connection.password">0x3137</property>
            <!-- 将hibernate生成的sql语句打印到控制台 -->
            <property name="hibernate.show_sql">true</property>
            <!-- 将hibernate生成的sql语句格式化(语法缩进) -->
            <property name="hibernate.format_sql">true</property>
            <!-- 配置getCurrentSession -->
            <property name="hibernate.current_session_context_class">thread</property>
            <mapping resource="com/domain/User.hbm.xml" />
        </session-factory>
        
        
    </hibernate-configuration>

实现

import java.util.List;

import org.hibernate.*;

import com.itnba.maya.model.Toy;
import com.itnba.maya.model.HibernateUtil;

public class toy {

    public static void main(String[] args) {
        Fruit data = new Fruit();
        data.setIds("001");
        data.setName("car");
        data.setSource("unknow");
        data.setPrice(998);
        data.setNumbers(100);
        data.setImage("null");
        
        Session session=null;
        try{
            session=HibernateUtil.getSession();
            session.beginTransaction();
            session.save(data);
            session.getTransaction().commit();
        }catch (Exception e) {
            session.getTransaction().rollback();
        }finally {
            HibernateUtil.closeSession();
        }    
    }

}