绑定本地的Session

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>