<!-- 1. 数据库连接配置 -->
        <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
        <property name="hibernate.connection.url">jdbc:mysql:///hib_demo</property>
        <property name="hibernate.connection.username">root</property>
        <property name="hibernate.connection.password">root</property>
        <!-- 
            数据库方法配置， hibernate在运行的时候，会根据不同的方言生成符合当前数据库语法的sql【大致可以理解成：不同的版本对应的SQL不同】
         -->
        <property name="hibernate.dialect">org.hibernate.dialect.MySQL5Dialect</property>

<!-- 2. 其他相关配置 -->
        <!-- 2.1 显示hibernate在运行时候执行的sql语句 -->
        <property name="hibernate.show_sql">true</property>
        <!-- 2.2 格式化sql -->
        <property name="hibernate.format_sql">true</property>
        <!-- 2.3 自动建表  -->
        <property name="hibernate.hbm2ddl.auto">update</property>

<!--3. 加载映射文件-->
        <mapping resource="zhongfucheng/domain/User.hbm.xml"/>

//获取加载配置管理类
        Configuration configuration = new Configuration();
        //加载User的映射文件！
        configuration.configure().addClass(User.class);

<!--在domain包下-->
<hibernate-mapping package="zhongfucheng.domain">
    <!--类名为User，表名也为User-->
    <class name="User"  table="user">
        <!--主键映射，属性名为id，列名也为id-->
        <id name="id" column="id">
            <!--根据底层数据库主键自动增长-->
            <generator class="native"/>
        </id>
        <!--非主键映射，属性和列名一一对应-->
        <property name="username" column="username"/>
        <property name="cellphone" column="cellphone"/>
        <property name="password" column="password"/>
    </class>
</hibernate-mapping>

public class User2 {
    private String username;
    private String password;
    private String cellphone;
    //各种setter和getter方法 
}

package zhongfucheng.domain;
/**
 * Created by ozc on 2017/5/6.
 */
public class CompositeKey  implements Serializable{
    private String username;
    private String password;
    public String getUsername() {
        return username;
    }
    public void setUsername(String username) {
        this.username = username;
    }
    public String getPassword() {
        return password;
    }
    public void setPassword(String password) {
        this.password = password;
    }
}

package zhongfucheng.domain;
/**
 * Created by ozc on 2017/5/6.
 */
public class User2 {
    //在User对象中维护这个主键对象
    private CompositeKey key;
    private String cellphone;
    public CompositeKey getKey() {
        return key;
    }
    public void setKey(CompositeKey key) {
        this.key = key;
    }
    public String getCellphone() {
        return cellphone;
    }
    public void setCellphone(String cellphone) {
        this.cellphone = cellphone;
    }
}

public static void main(String[] args) {
        //创建对象
        User2 user2 = new User2();
        CompositeKey compositeKey = new CompositeKey();
        compositeKey.setUsername("123");
        compositeKey.setPassword("123");
        user2.setCellphone("111");
        user2.setKey(compositeKey);
        //获取加载配置管理类
        Configuration configuration = new Configuration();
        //加载User的映射文件！
        configuration.configure().addClass(User2.class);
        //创建Session工厂对象
        SessionFactory factory = configuration.buildSessionFactory();
        //得到Session对象
        Session session = factory.openSession();
        //使用Hibernate操作数据库，都要开启事务,得到事务对象
        Transaction transaction = session.getTransaction();
        //开启事务
        transaction.begin();
        //添加User2对象到数据库
        session.save(user2);
        //提交事务
        transaction.commit();
        //关闭Session
        session.close();
    }