//这是id-card的映射文件
<?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="demo01">
    <class name="id_card">
        <id name="id">
            <generator class="native" />
        </id>
        <property name="name" />
        <one-to-one name="Person" />
        <!-- 创建一对一映射 -->
    </class>
</hibernate-mapping>

//这是id-card类实例
package demo01;

public class id_card {
    private int id;
    private String name;
    private Person per;

    public int getId() {
        return id;
    }

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

    public String getName() {
        return name;
    }

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

    public Person getPer() {
        return per;
    }

    public void setPer(Person per) {
        this.per = per;
    }

}

//这是配置文件
<?xml version='1.0' encoding='UTF-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
          "-//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="dialect">org.hibernate.dialect.MySQLDialect</property>
        <property name="connection.url">jdbc:mysql://localhost:3306/data_01</property>
        <property name="connection.username">root</property>
        <property name="connection.password">mysqladmin</property>
        <property name="connection.driver_class">com.mysql.jdbc.Driver</property>
        <property name="myeclipse.connection.profile">MyEclipse Derby</property>
        <property name="show_sql">true</property>
        <property name="hbm2ddl.auto">create</property>
        <mapping resource="DAO_/User.bhm.xml" />
        <mapping resource="DAO_/School.bhm.xml" />
        <mapping resource="DAO_/Student.bhm.xml" />
        <mapping resource="demo01/Person.bhm.xml" />
        <mapping resource="demo01/id_card.bhm.xml" />
    </session-factory>
</hibernate-configuration>

下面是报告的异常 说无法从配置文件 初始化id_card的映射
Exception in thread "main" org.hibernate.InvalidMappingException: Could not parse mapping document from resource demo01/id

<?xml version="1.0" encoding="utf-8"?>
<!-- 映射文件需要指定格式 -->
<!DOCTYPE hibernate-mapping PUBLIC
        "-//Hibernate/Hibernate Mapping DTD 3.0//EN"