Document

绑定本地的Session图示解析:

 代码的结构：

代码:

SaveServlet.java

package com.itheima.servlet;

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.itheima.domain.User;
import com.itheima.service.UserService;

/**
 * Servlet implementation class SaveServlet
 */
public class SaveServlet extends HttpServlet {
    private static final long serialVersionUID = 1L;
       

    public SaveServlet() {
        super();
    }


    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        User u1=new User();
        u1.setName("测试一");
        
        User u2=new User();
        u2.setName("测试二");
        
        new UserService().save(u1, u2);
    }


    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
            // TODO Auto-generated method stub
            doGet(request, response);
    }

}

UserService.java

package com.itheima.service;

import org.hibernate.Session;
import org.hibernate.Transaction;

import com.itheima.dao.UserDao;
import com.itheima.domain.User;
import com.itheima.utils.HibernateUtils;

public class UserService {

    public void save(User u1,User u2) {
        UserDao dao=new UserDao();
        //获取session
        Session session=HibernateUtils.getCurrentSession();
        //开启事务
        Transaction tr=session.beginTransaction();
        try {
            dao.save1(u1);
            dao.save2(u2);
            //提交事务
            tr.commit();
        } catch (Exception e) {
            e.printStackTrace();
            //出现问题:回滚事务
            tr.rollback();
        }finally {
            
        }
        
    }
}

 UserDao.java

package com.itheima.dao;

import org.hibernate.Hibernate;
import org.hibernate.Session;
import org.hibernate.Transaction;

import com.itheima.domain.User;
import com.itheima.utils.HibernateUtils;

public class UserDao {

    public void save1(User u1) {
    
        Session session=HibernateUtils.getCurrentSession();
        session.save(u1);
    }
    public void save2(User u2) {
        Session session=HibernateUtils.getCurrentSession();
        session.save(u2);
    }
}

HibernateUtils.java(稍微修改)

package com.itheima.utils;

import javax.servlet.jsp.jstl.core.Config;

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

/*
 * Hibernate框架的工具
 * @author chenyanlong
 */
public class HibernateUtils {

    //Curl+shift+x
    private static final Configuration CONFIG;
    private static final SessionFactory FACTORY;
    
    //编写静态代码
    static {
        //加载配置文件
        CONFIG =new Configuration().configure();
        //构造工厂
        FACTORY=CONFIG.buildSessionFactory();
    }
    
    /*
     * 从工厂获取Session对象
     * @return
     */
    public static Session getSession() {
        return FACTORY.openSession();
        
    }
    //获取本地Session
    public static Session getCurrentSession() {
        return FACTORY.getCurrentSession();
    }
    public static  void main(String[] args) {
        //调用获取session的方法
        getSession();
    }
}

hibernate.cfg.xml（开启绑定本地的session）

<?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>
    <!-- 记住:先配置sessionFactoryy -->
    
    <session-factory>
        <!-- 必须的配置 -->
        <!-- 配置连接数据库的基本的信息: -->
        <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
        <property name="hibernate.connection.url">jdbc:mysql:///hibernate_day02</property>
        <property name="hibernate.connection.username">root</property>
        <property name="hibernate.connection.password">123456</property>
        
        <!-- 数据库的方言: -->
        <property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
        <!-- 可选配置 -->
        <!-- 显示SQL语句，在控制台显示 -->
        <property name="hibernate.show_sql">true</property>
        <!-- 格式化SQL语句 -->
        <property name="hibernate.format_sql">true</property>
        <!-- 生成数据库的表结构 
            update：如果没有表结构，创建表结构。如果存在，不会创建，添加数据
        -->
        <property name="hibernate.hbm2ddl.auto">update</property>
        
        <!-- 设置数据库的隔离级别，就使用默认值就OK 
        <property name="hibernate.connection.isolation">4</property>
        -->
        
        <!-- 开启绑定本地的session -->
        <property name="hibernate.current_session_context_class">thread</property>
        
        <!-- 映射配置文件，需要引入映射的配置文件 -->
        <mapping resource="com/itheima/domain/User.hbm.xml"/>
        

    </session-factory>
</hibernate-configuration>