绑定本地的Session

Posted 2021-01-11 chenyanlong

绑定本地的Session图示解析:

 代码的结构：

代码:

SaveServlet.java

 1 package com.itheima.servlet;
 2 
 3 import java.io.IOException;
 4 import javax.servlet.ServletException;
 5 import javax.servlet.http.HttpServlet;
 6 import javax.servlet.http.HttpServletRequest;
 7 import javax.servlet.http.HttpServletResponse;
 8 
 9 import com.itheima.domain.User;
10 import com.itheima.service.UserService;
11 
12 /**
13  * Servlet implementation class SaveServlet
14  */
15 public class SaveServlet extends HttpServlet {
16     private static final long serialVersionUID = 1L;
17        
18 
19     public SaveServlet() {
20         super();
21     }
22 
23 
24     protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
25         User u1=new User();
26         u1.setName("测试一");
27         
28         User u2=new User();
29         u2.setName("测试二");
30         
31         new UserService().save(u1, u2);
32     }
33 
34 
35     protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
36             // TODO Auto-generated method stub
37             doGet(request, response);
38     }
39 
40 }

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UserService.java

 1 package com.itheima.service;
 2 
 3 import org.hibernate.Session;
 4 import org.hibernate.Transaction;
 5 
 6 import com.itheima.dao.UserDao;
 7 import com.itheima.domain.User;
 8 import com.itheima.utils.HibernateUtils;
 9 
10 public class UserService {
11 
12     public void save(User u1,User u2) {
13         UserDao dao=new UserDao();
14         //获取session
15         Session session=HibernateUtils.getCurrentSession();
16         //开启事务
17         Transaction tr=session.beginTransaction();
18         try {
19             dao.save1(u1);
20             dao.save2(u2);
21             //提交事务
22             tr.commit();
23         } catch (Exception e) {
24             e.printStackTrace();
25             //出现问题:回滚事务
26             tr.rollback();
27         }finally {
28             
29         }
30         
31     }
32 }

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 UserDao.java

 1 package com.itheima.dao;
 2 
 3 import org.hibernate.Hibernate;
 4 import org.hibernate.Session;
 5 import org.hibernate.Transaction;
 6 
 7 import com.itheima.domain.User;
 8 import com.itheima.utils.HibernateUtils;
 9 
10 public class UserDao {
11 
12     public void save1(User u1) {
13     
14         Session session=HibernateUtils.getCurrentSession();
15         session.save(u1);
16     }
17     public void save2(User u2) {
18         Session session=HibernateUtils.getCurrentSession();
19         session.save(u2);
20     }
21 }

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HibernateUtils.java(稍微修改)

 1 package com.itheima.utils;
 2 
 3 import javax.servlet.jsp.jstl.core.Config;
 4 
 5 import org.hibernate.Session;
 6 import org.hibernate.SessionFactory;
 7 import org.hibernate.cfg.Configuration;
 8 
 9 /*
10  * Hibernate框架的工具
11  * @author chenyanlong
12  */
13 public class HibernateUtils {
14 
15     //Curl+shift+x
16     private static final Configuration CONFIG;
17     private static final SessionFactory FACTORY;
18     
19     //编写静态代码
20     static {
21         //加载配置文件
22         CONFIG =new Configuration().configure();
23         //构造工厂
24         FACTORY=CONFIG.buildSessionFactory();
25     }
26     
27     /*
28      * 从工厂获取Session对象
29      * @return
30      */
31     public static Session getSession() {
32         return FACTORY.openSession();
33         
34     }
35     //获取本地Session
36     public static Session getCurrentSession() {
37         return FACTORY.getCurrentSession();
38     }
39     public static  void main(String[] args) {
40         //调用获取session的方法
41         getSession();
42     }
43 }

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hibernate.cfg.xml（开启绑定本地的session）

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <!DOCTYPE hibernate-configuration PUBLIC
 3     "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
 4     "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
 5 
 6 <hibernate-configuration>
 7     <!-- 记住:先配置sessionFactoryy -->
 8     
 9     <session-factory>
10         <!-- 必须的配置 -->
11         <!-- 配置连接数据库的基本的信息: -->
12         <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
13         <property name="hibernate.connection.url">jdbc:mysql:///hibernate_day02</property>
14         <property name="hibernate.connection.username">root</property>
15         <property name="hibernate.connection.password">123456</property>
16         
17         <!-- 数据库的方言: -->
18         <property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
19         <!-- 可选配置 -->
20         <!-- 显示SQL语句，在控制台显示 -->
21         <property name="hibernate.show_sql">true</property>
22         <!-- 格式化SQL语句 -->
23         <property name="hibernate.format_sql">true</property>
24         <!-- 生成数据库的表结构 
25             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
26         -->
27         <property name="hibernate.hbm2ddl.auto">update</property>
28         
29         <!-- 设置数据库的隔离级别，就使用默认值就OK 
30         <property name="hibernate.connection.isolation">4</property>
31         -->
32         
33         <!-- 开启绑定本地的session -->
34         <property name="hibernate.current_session_context_class">thread</property>
35         
36         <!-- 映射配置文件，需要引入映射的配置文件 -->
37         <mapping resource="com/itheima/domain/User.hbm.xml"/>
38         
39 
40     </session-factory>
41 </hibernate-configuration>

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