1 package cn.happy.entity; 2  3 public class Emp { 4     private Integer empNo;      5     private String empName; 6     public Integer getEmpNo() { 7         return empNo; 8     } 9     public void setEmpNo(Integer empNo) {10         this.empNo = empNo;11     }12     public String getEmpName() {13         return empName;14     }15     public void setEmpName(String empName) {16         this.empName = empName;17     }18     19     20 21 }

 1 package cn.happy.util; 2  3 import org.hibernate.Session; 4 import org.hibernate.SessionFactory; 5 import org.hibernate.cfg.Configuration; 6  7 public class HibernateUtil { 8     private static final ThreadLocal sessionTL=new ThreadLocal(); 9     private static Configuration cf;10     private static final SessionFactory factory;11     static{12         try {13             cf=new Configuration().configure();14             factory=cf.buildSessionFactory();15         } catch (Exception e) {16             throw new ExceptionInInitializerError(e);17         }18     }19     public static Session getSession()20     {    21         //sessionTL的get()方法根据当前线程返回其对应的线程内部变量，22                 //也就是我们需要的Session，多线程情况下共享数据库连接是不安全的。23                 //ThreadLocal保证了每个线程都有自己的Session。24         Session session = (Session)sessionTL.get();25         //如果session为null，则打开一个新的session26         if (session==null) {27             //创建一个数据库连接对象session28             session=factory.openSession();29             //保存该数据库连接session到ThreadLocal中。30             sessionTL.set(session);31             32         }33         //如果当前线程已经访问过数据库了，34                 //则从sessionTL中get()就可以获取该线程上次获取过的数据库连接对象。35                 return session; 36     }37     /**38      * 关闭Session39      */40     public static void closeSession()41     {42         Session session =(Session)sessionTL.get();43         sessionTL.set(null);44         session.close();45     }46 47 }

package cn.happy.test;import org.hibernate.Session;import org.hibernate.Transaction;import org.junit.Test;import cn.happy.entity.Emp;import cn.happy.util.HibernateUtil;public class STest {    Transaction tx;    Session session;    Transaction tx2;    Session session2;     @Test       public void testBulk(){            session = HibernateUtil.getSession();            tx=session.beginTransaction();           Emp emp = (Emp)session.get(Emp.class, 1);           System.out.println(emp);           tx.commit();           HibernateUtil.closeSession();           System.out.println("===================");           session2 = HibernateUtil.getSession();            tx2=session2.beginTransaction();           Emp emp2 = (Emp)session2.get(Emp.class, 1);           System.out.println(emp2);           tx2.commit();           HibernateUtil.closeSession();       }    }

<?xml version=‘1.0‘ encoding=‘utf-8‘?><!DOCTYPE hibernate-mapping PUBLIC     "-//Hibernate/Hibernate Mapping DTD 3.0//EN"    "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">    <hibernate-mapping package="cn.happy.entity">     <class name="Emp" table="Emp">     <cache usage="read-write"/>         <id name="empNo" type="int" column="EMPNO">         <generator class="native">         </generator>        </id>         <property name="empName" type="string" column="EMPNAME"/>     </class>     </hibernate-mapping>

<?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>    <property name="connection.driver_class">oracle.jdbc.OracleDriver</property>    <property name="connection.url">jdbc:oracle:thin:@localhost:1521:orcl</property>    <property name="connection.username">zc</property>        <property name="connection.password">zc</property>        <!-- 输出所有 SQL 语句到控制台。 -->        <property name="hibernate.show_sql">true</property>        <!-- 配置Hibernate.cfg.xml开启二级缓存。 -->          <property name="hibernate.cache.use_second_level_cache">true</property>          <!-- 配置二级缓存的供应商 -->        <property name="hibernate.cache.provider_class">org.hibernate.cache.EhCacheProvider</property>                <!-- 在 log 和 console 中打印出更漂亮的 SQL。 -->        <property name="hibernate.format_sql">true</property>        <!-- 自动生成数据表，update/create -->        <property name="hbm2ddl.auto">update</property>        <!-- 方言 -->        <property name="hibernate.dialect">    org.hibernate.dialect.Oracle10gDialect</property>        <!-- 关联小配置 -->                <mapping resource="cn/happy/entity/Emp.hbm.xml"/>        <class-cache    usage="read-write" class="cn.happy.entity.Emp"/>    </session-factory>    </hibernate-configuration>