搭建一个单纯学习hibernate的项目详解编程语言

 project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 

 xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd" 

 modelVersion 4.0.0 /modelVersion 

 groupId crazyjava /groupId 

 artifactId hibernateTest /artifactId 

 version 0.0.1-SNAPSHOT /version 

 packaging jar /packaging 

 name hibernateTest /name 

 url http://maven.apache.org /url 

 properties 

 project.build.sourceEncoding UTF-8 /project.build.sourceEncoding 

 /properties 

 dependencies 

 dependency 

 groupId junit /groupId 

 artifactId junit /artifactId 

 version 4.10 /version 

 scope test /scope 

 /dependency 

 !-- mysql的依赖包 -- 

 dependency 

 groupId mysql /groupId 

 artifactId mysql-connector-java /artifactId 

 version 5.1.38 /version 

 /dependency 

 !-- Hibernate的依赖包 -- 

 dependency 

 groupId org.hibernate /groupId 

 artifactId hibernate-core /artifactId 

 version 4.3.11.Final /version 

 /dependency 

 !-- log4j -- 

 dependency 

 groupId log4j /groupId 

 artifactId log4j /artifactId 

 version 1.2.17 /version 

 /dependency 

 /dependencies 

 /project 

!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd" hibernate-configuration session-factory property name="hibernate.connection.driver_class" com.mysql.jdbc.Driver /property property name="hibernate.connection.password" root /property property name="hibernate.connection.url" jdbc:mysql://localhost:3306/hibernate /property property name="hibernate.connection.username" root /property property name="hibernate.dialect" org.hibernate.dialect.MySQL5InnoDBDialect /property property name="hbm2ddl.auto" update /property property name="show_sql" true /property mapping / mapping / mapping / /session-factory /hibernate-configuration

第二个是hbm文件 hibernate.cfg.xml

下面是hibernatutils

package lee; 

import org.hibernate.*; 

import org.hibernate.cfg.*; 

import org.hibernate.service.*; 

import org.hibernate.boot.registry.*; 

public class HibernateUtil 

 public static final SessionFactory sessionFactory; 

 static 

 try 

 // 使用默认的hibernate.cfg.xml配置文件创建Configuration实例 

 Configuration cfg = new Configuration() 

 .configure(); 

 // 以Configuration实例来创建SessionFactory实例 

 ServiceRegistry serviceRegistry = new StandardServiceRegistryBuilder() 

 .applySettings(cfg.getProperties()).build(); 

 sessionFactory = cfg.buildSessionFactory(serviceRegistry); 

 catch (Throwable ex) 

 System.err.println("Initial SessionFactory creation failed." + ex); 

 throw new ExceptionInInitializerError(ex); 

 // ThreadLocal可以隔离多个线程的数据共享，因此不再需要对线程同步 

 public static final ThreadLocal Session session 

 = new ThreadLocal Session 

 public static Session currentSession() 

 throws HibernateException 

 Session s = session.get(); 

 // 如果该线程还没有Session,则创建一个新的Session 

 if (s == null) 

 s = sessionFactory.openSession(); 

 // 将获得的Session变量存储在ThreadLocal变量session里 

 session.set(s); 

 return s; 

 public static void closeSession() 

 throws HibernateException 

 Session s = session.get(); 

 if (s != null) 

 s.close(); 

 session.set(null); 

下面是实体类和测试类

package lee; 

import org.hibernate.*; 

import org.hibernate.cfg.*; 

import org.hibernate.service.*; 

import org.hibernate.boot.registry.*; 

import org.crazyit.app.domain.*; 


 Configuration conf = new Configuration() 

 // 不带参数的configure()方法默认加载hibernate.cfg.xml文件， 

 // 如果传入abc.xml作为参数，则不再加载hibernate.cfg.xml，改为加载abc.xml 

 .configure(); 

 ServiceRegistry serviceRegistry = new StandardServiceRegistryBuilder() 

 .applySettings(conf.getProperties()).build(); 

 // 以Configuration实例创建SessionFactory实例 

 SessionFactory sf = conf.buildSessionFactory(serviceRegistry); 

 // 创建Session 

 Session sess = sf.openSession(); 

 // 开始事务 

 Transaction tx = sess.beginTransaction(); 

 // 创建消息对象 

 News n = new News(); 

 // 设置消息标题和消息内容 

 n.setTitle("疯狂Java联盟成立了"); 

 n.setContent("疯狂Java联盟成立了，" 

 + "网站地址http://www.crazyit.org"); 

 // 保存消息 

 sess.save(n); 

 // 提交事务 

 tx.commit(); 

 // 关闭Session 

 sess.close(); 

 sf.close(); 

}