public class Emp {private Integer empId;//员工IDprivate String empname; //员工姓名public Integer getEmpId() {return empId;}public void setEmpId(Integer empId) {this.empId = empId;}public String getEmpname() {return empname;}public void setEmpname(String empname) {this.empname = empname;}}

<hibernate-configuration><session-factory><!-- 1.连接数据库的语句 --><property name="connection.driver_class">oracle.jdbc.OracleDriver</property><property name="connection.url">jdbc:oracle:thin:@localhost:1521:orcl</property><property name="connection.username">scott</property><property name="connection.password">0123</property><!-- 输出所有 SQL 语句到控制台。 --><property name="hibernate.show_sql">true</property> <!-- 在 log 和 console 中打印出更漂亮的 SQL。 --><property name="hibernate.format_sql">true</property><!-- 方言 --><property name="hibernate.dialect">    org.hibernate.dialect.Oracle10gDialect</property><!-- hbm2ddl --> <property name="hibernate.hbm2ddl.auto">update</property><!-- 支持getCurrentSession的 属性配置 --><property name="hibernate.current_session_context_class">thread</property><!-- 关联小配置 --><!-- <mapping resource="cn/happy/entity/Project.hbm.xml"/> --> <mapping resource="entity/Emp.hbm.xml"/></session-factory></hibernate-configuration>

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping package="entity"><class name="Emp" table="Emp2"><id name="empId" column="EMPID"><generator class="native"></generator></id><property name="empname" type="string" column="empname"></property><!-- 多对多 --><!-- <set name="pros" table="ProEmp"><key column="nid"></key><many-to-many class="Project" column="pid"></many-to-many> </set>--></class></hibernate-mapping>

public class HibernateUtil {private static final ThreadLocal sessionTL = new ThreadLocal(); private static Configuration configuration;//
    private  static final SessionFactory sessionFactory;static{try {configuration=new Configuration().configure();sessionFactory=configuration.buildSessionFactory();} catch (Exception e) {throw new ExceptionInInitializerError(e);}}public static Session getSession() {Session session = (Session)sessionTL.get();if(session==null){session = sessionFactory.openSession();sessionTL.set(session);}return session;}public static void closeSession(){Session session = (Session)sessionTL.get();sessionTL.set(null);session.close();}}

package dao;import java.io.Serializable;import util.HibernateUtil;public class Mydao {public Object  get(Class clazz,Serializable id){System.out.println("dao\t"+HibernateUtil.getSession());Object result= HibernateUtil.getSession().load(clazz, id);return result;}}

public class Hibernatebiz {Mydao dao=new Mydao();public Object get(Class clazz,Serializable id){// Transaction tx = HibernateUtil.getSession().beginTransaction();Object obj= dao.get(clazz, id);System.out.println("==============================================");//  tx.commit();// HibernateUtil.closeSession();return obj;}}

public class MyFilter implements Filter{public void destroy() {// TODO Auto-generated method stub
        }public void doFilter(ServletRequest request, ServletResponse response,FilterChain chain) throws IOException, ServletException {Session session;Transaction tx=null;try {session=HibernateUtil.getSession();tx=session.beginTransaction();chain.doFilter(request, response);tx.commit();} catch (Exception e) {e.printStackTrace();tx.rollback();}finally{HibernateUtil.closeSession();}}

public class H_01Test {@Testpublic void addTest(){Hibernatebiz biz=new Hibernatebiz();Object object = biz.get(Emp.class,1);Emp emp=(Emp)object;System.out.println(emp.getEmpname());}}