hibernate测试出错No suitable driver found for jdbc:oracle:thin:@localhost:1521:orcl

hibernate测试报错No suitable driver found for jdbc:oracle:thin:@localhost:1521:orcl
学习hibernate，执行save方法报错。

org.hibernate.exception.JDBCConnectionException: Cannot open connection
at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:97)
at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:66)
at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:52)
at org.hibernate.jdbc.ConnectionManager.openConnection(ConnectionManager.java:449)
at org.hibernate.jdbc.ConnectionManager.getConnection(ConnectionManager.java:167)
at org.hibernate.jdbc.JDBCContext.connection(JDBCContext.java:142)
at org.hibernate.transaction.JDBCTransaction.begin(JDBCTransaction.java:85)
at org.hibernate.impl.SessionImpl.beginTransaction(SessionImpl.java:1353)
at com.bjpowernode.hibernate.Client.main(Client.java:24)
Caused by: java.sql.SQLException: No suitable driver found for jdbc:oracle:thin:@localhost:1521:orcl
at java.sql.DriverManager.getConnection(DriverManager.java:602)
at java.sql.DriverManager.getConnection(DriverManager.java:154)
at org.hibernate.connection.DriverManagerConnectionProvider.getConnection(DriverManagerConnectionProvider.java:133)
at org.hibernate.jdbc.ConnectionManager.openConnection(ConnectionManager.java:446)
... 5 more
Exception in thread "main" org.hibernate.TransactionException: Transaction not successfully started
at org.hibernate.transaction.JDBCTransaction.rollback(JDBCTransaction.java:183)
at com.bjpowernode.hibernate.Client.main(Client.java:39)

使用 hibernate3.6  + oracle11g数据库


配置文件放在src目录下

试过用classes12.jar，报同样错误，附上代码及配置，麻烦高手帮看看
hibernate.cfg.xml：
<!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="hibernate.connection.driver_class">org.hibernate.dialect.Oracle10gDialect</property>
<property name="hibernate.connection.url">jdbc:oracle:thin:@localhost:1521:orcl</property>
<property name="hibernate.connection.username">system</property>
<property name="hibernate.connection.password">system</property>
<property name="hibernate.dialect">org.hibernate.dialect.Oracle10gDialect</property>
<property name="hibernate.show_sql">true</property>
<!-- <property name="hibernate.format_sql">true</property>-->

<mapping resource="com/bjpowernode/hibernate/User.hbm.xml"/>
</session-factory>
</hibernate-configuration>

User.java 

package com.bjpowernode.hibernate;

import java.util.Date;

public class User {

private String id;

private String name;

private String password;

private Date createTime;

private Date expireTime;

public String getId() {
return id;
}

public void setId(String id) {
this.id = id;
}

public String getName() {
return name;
}

public void setName(String name) {
this.name = name;
}

public String getPassword() {
return password;
}

public void setPassword(String password) {
this.password = password;
}

public Date getCreateTime() {
return createTime;
}

public void setCreateTime(Date createTime) {
this.createTime = createTime;
}

public Date getExpireTime() {
return expireTime;
}

public void setExpireTime(Date expireTime) {
this.expireTime = expireTime;
}
}


测试类：
package com.bjpowernode.hibernate;

import java.util.Date;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;

public class Client {//测试类2

public static void main(String[] args) {

//读取hibernate.cfg.xml文件
Configuration cfg = new Configuration().configure();

//建立SessionFactory
SessionFactory factory = cfg.buildSessionFactory();

//取得session
Session session = null;
try {
session = factory.openSession();
//开启事务
session.beginTransaction();//报错
User user = new User();
user.setName("张三");
user.setPassword("123");
user.setCreateTime(new Date());
user.setExpireTime(new Date());

//保存User对象
session.save(user);//报错

//提交事务
session.getTransaction().commit();
}catch(Exception e) {
e.printStackTrace();
//回滚事务
session.getTransaction().rollback();
}finally {