public class User {

private Integer id;

private String uname;

private String upass;

...省略set和get方法

}

 <class name="www.change.tm.bean.User" table="USERS">

         <id name="id" type="java.lang.Integer">

             <column name="ID" />

             <generator class="native" />

         </id>

         <property name="uname" type="java.lang.String">

             <column name="UNAME" />

         </property>

         <property name="upass" type="java.lang.String">

             <column name="UPASS" />

         </property>

     </class>

 <session-factory>

                 <!-- 配置hibernate的基本信息 -->

          <property name="connection.username">****</property>

          <property name="connection.password">****</property>

          <property name="connection.driver_class">com.mysql.jdbc.Driver</property>

          <property name="connection.url">jdbc:mysql:///hibernate3</property>

          <!-- hibernate的基本配置 -->

          <!-- 数据库方言 -->

          <property name="dialect">org.hibernate.dialect.MySQLDialect</property>

          <!-- 是否打印sql -->

          <property name="show_sql">true</property>

          <!-- 是否格式化sql -->

          <property name="format_sql">true</property>

          <!-- 生成表的策略 -->

          <property name="hbm2ddl.auto">update</property>

           <mapping resource="www/change/tm/bean/User.hbm.xml"/>

     </session-factory>

package www.change.tm.action;

import java.util.Map;

import org.apache.struts2.ServletActionContext;

import www.change.tm.bean.User;

import www.change.tm.dao.UserDao;

import www.change.tm.dao.UserDaoImpl;

import com.opensymphony.xwork2.ActionContext;

import com.opensymphony.xwork2.ActionSupport;

public class Login extends ActionSupport{

    //声明dao对象

    UserDao userdao = new UserDaoImpl();

    private String uname;

    private String upass;

    public String login(){

        User user = userdao.login(uname, upass);

        if (user != null ) {

            // 存入到session会话中

            ServletActionContext.getRequest().getSession()

                    .setAttribute("user", user);

                return SUCCESS;

        } else {

            ServletActionContext.getRequest().setAttribute("msg", "用户名或者密码");

            return ERROR;

        }

    }

    public void setUname(String uname) {

        this.uname = uname;

    }

    public void setUpass(String upass) {

        this.upass = upass;

    }

}

public interface UserDao {

    /*

     * 登录验证处理

     */

    public User login(String uname,String upass);

}

public class UserDaoImpl extends BaseDaoImpl implements UserDao{

    @Override

    public User login(String uname, String upass) {

        //1.获取session对象

        Session session = getSession();

        //2.执行查询

        Query createQuery = session.createQuery("from User u where u.uname=? and u.upass=?");

        User user = (User)createQuery.setString(0, uname).setString(1, upass).uniqueResult();

        /*总的写

        User user =(User) getSession().createQuery("").setString(0, uname).setString(1, upass).uniqueResult();

        */

        //3.session关闭

        HiberSessionFactory.closeSession();

        return user;

    }

}

public class BaseDaoImpl implements BaseDao{

    @Override

    public Session getSession() {

        // TODO Auto-generated method stub

        return HibernateControl.getSession();

    }

}

 package www.change.tm.util;

 import org.hibernate.HibernateException;

 import org.hibernate.Session;

 import org.hibernate.cfg.Configuration;

 import org.hibernate.service.ServiceRegistry;

 import org.hibernate.service.ServiceRegistryBuilder;

 /**

  * Configures and provides access to Hibernate sessions, tied to the

  * current thread of execution.  Follows the Thread Local Session

  * pattern, see {@link http://hibernate.org/42.html }.

  */

 public class HiberSessionFactory {

     /**

      * Location of hibernate.cfg.xml file.

      * Location should be on the classpath as Hibernate uses

      * #resourceAsStream style lookup for its configuration file.

      * The default classpath location of the hibernate config file is

      * in the default package. Use #setConfigFile() to update

      * the location of the configuration file for the current session.

      */

     private static final ThreadLocal<Session> threadLocal = new ThreadLocal<Session>();

     private static org.hibernate.SessionFactory sessionFactory;

     private static Configuration configuration = new Configuration();

     private static ServiceRegistry serviceRegistry; 

     static {

         try {

             System.out.println("@@@@@@@@@@@@@@@@@@@@@@@@@@@");

             configuration.configure();

             System.out.println("configuration="+configuration);

             serviceRegistry = new ServiceRegistryBuilder().applySettings(configuration.getProperties()).buildServiceRegistry();

             System.out.println("serviceRegistry="+serviceRegistry);

             sessionFactory = configuration.buildSessionFactory(serviceRegistry);

             System.out.println();

         } catch (Exception e) {

             System.err.println("%%%% Error Creating SessionFactory %%%%");

             e.printStackTrace();

         }

     }

     private HiberSessionFactory() {

     }

     /**

      * Returns the ThreadLocal Session instance.  Lazy initialize

      * the <code>SessionFactory</code> if needed.

      *

      *  @return Session

      *  @throws HibernateException

      */

     public static Session getSession() throws HibernateException {

         Session session = (Session) threadLocal.get();

         if (session == null || !session.isOpen()) {

             if (sessionFactory == null) {

                 rebuildSessionFactory();

             }

             session = (sessionFactory != null) ? sessionFactory.openSession()

                     : null;

             threadLocal.set(session);

         }

         return session;

     }

     /**

      *  Rebuild hibernate session factory

      *

      */

     public static void rebuildSessionFactory() {

         try {

             configuration.configure();

             serviceRegistry = new ServiceRegistryBuilder().applySettings(configuration.getProperties()).buildServiceRegistry();

             sessionFactory = configuration.buildSessionFactory(serviceRegistry);

         } catch (Exception e) {

             System.err.println("%%%% Error Creating SessionFactory %%%%");

             e.printStackTrace();

         }

     }

     /**

      *  Close the single hibernate session instance.

      *

      *  @throws HibernateException

      */

     public static void closeSession() throws HibernateException {

         Session session = (Session) threadLocal.get();

         threadLocal.set(null);

         if (session != null) {

             session.close();

         }

     }

     /**

      *  return session factory

      *

      */

     public static org.hibernate.SessionFactory getSessionFactory() {

         return sessionFactory;

     }

     /**

      *  return hibernate configuration

      *

      */

     public static Configuration getConfiguration() {

         return configuration;

     }

 }