四、搭配hibernate
1. 在src下建立以下包
     1.com.test.dao
     2.com.test.imp
     3.com.test.pojo
    4.com.test.servicedao
    5.com.test.servicedaoimp
    6.com.test.util
    7.com.test.exception
2. 在pojo中建user类，实现Serializable接口
3. 在dao中写接口  interface userdao   加入方法，validate（）方法
4. 在imp中写userim实现userdao并实现其方法
5. 在pojo中新建User.hbm.xml
 
//Hibernate/Hibernate Mapping DTD 3.0//EN\" \"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd\" >    
<hibernate-mapping package=\"com.test.pojo\">    
<class name=\"User\" table=\"users\" >    

    <id name=\"usersId\" type=\"long\">    
        <column name=\"usersId\"></column>    
        <generator class=\"increment\"></generator>    
    </id>    
    <property name=\"usersName\" type=\"string\">    
        <column name=\"usersName\"></column>    
    </property>    
    <property name=\"usersPw\" type=\"string\">    
        <column name=\"usersPw\"></column>    
    </property>        
</class>    
</hibernate-mapping>    
 
6、测试hibernate
   (1)在util包下建HibernateUtils.java
package com.test.util;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
public class HibernateUtils {
  private static SessionFactory factory;
  static {
    try {
      Configuration cfg = new Configuration().configure();
      factory = cfg.buildSessionFactory();
    }catch(Exception e) {
      e.printStackTrace();
    }
  }
    
  public static SessionFactory getSessionFactory() {
    return factory;
  }
    
  public static Session getSession() {
    return factory.openSession();
  }
    
  public static void closeSession(Session session) {
    if (session != null) {
      if (session.isOpen()) {
        session.close();
      }
    }
  }
}
   (1)在util包下建ExportDB .java
package com.test.util;    

import org.hibernate.cfg.Configuration;    
import org.hibernate.tool.hbm2ddl.SchemaExport;    

public class ExportDB {    

    public static void main(String[] args) {    
            
        //读取hibernate.cfg.xml文件    
        Configuration cfg = new Configuration().configure();    
        SchemaExport export = new SchemaExport(cfg);    
        export.create(true, true);    
    }    
}    
(3) 建hibernate.cfg.xml
//Hibernate/Hibernate Configuration DTD 3.0//EN\"    
                                        \"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd\">    

<!-- Generated by MyEclipse Hibernate Tools.                                                                         -->    
<hibernate-configuration>    

<session-factory>    
    <property name=\"connection.driver_class\">com.mysql.jdbc.Driver</property>    
    <property name=\"connection.url\">jdbc:mysql://localhost:3306/b2c2</property>    
    <property name=\"dialect\">org.hibernate.dialect.MySQLDialect</property>    
    <property name=\"myeclipse.connection.profile\">mysql</property>    
    <property name=\"connection.username\">root</property>    
    <property name=\"connection.password\">root</property>    

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

    <mapping resource=\"com/test/pojo/Privilege.hbm.xml\" />    
    <mapping resource=\"com/test/pojo/Role.hbm.xml\" />    
    <mapping resource=\"com/test/pojo/User.hbm.xml\" />    

</session-factory>    

</hibernate-configuration>
 
(4) 可以在util里写一Main方法对hibernate进行测试