hibernate复合主键

需要用到实体类Role的主键和Menu的主键结合起来作为实体类RoleMenu的主键，那么通过Hibernate具体实现如下：

RoleMenu实体类：（注意该实体类需要实现Serializable接口），且在Hibernate.cfg.xml文件中，复合主键用到的类的映射的xml文件需要放在改类映射的xml文件之前。

package com.cdms.model;

import java.io.Serializable;

/**
 * 角色权限类
 * @author MY
 *
 */
public class RoleMenu implements Serializable {

    /**
     * 
     */
    private static final long serialVersionUID = 1L;

    private Role role;//角色ID
    private MenuInfo menuInfo;//菜单id
    
    public Role getRole() {
        return role;
    }
    public void setRole(Role role) {
        this.role = role;
    }
    public MenuInfo getMenuInfo() {
        return menuInfo;
    }
    public void setMenuInfo(MenuInfo menuInfo) {
        this.menuInfo = menuInfo;
    }
    
    
    
}

RoleMenu.hbm.xml文件：

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<!-- Generated 2016-11-24 20:04:53 by Hibernate Tools 3.5.0.Final -->
<hibernate-mapping>
    <class name="com.cdms.model.RoleMenu" table="tb_roleMenu">
        <composite-id>
        <key-many-to-one  name="menuInfo" class="com.cdms.model.MenuInfo">
         <column name="rm_menuInfoId" />
        </key-many-to-one>
        <key-many-to-one  name="role" class="com.cdms.model.Role">
          <column name="rm_roleId" />
        </key-many-to-one>
        
        </composite-id>
    </class>
</hibernate-mapping>