<span style="font-family:KaiTi_GB2312;font-size:18px;"><hibernate-mapping> 
  <class name="com.bjpowernode.hibernate.User" table="t_user"> 
    <id name="id"> 
      <generator class="native"/> 
    </id> 
    <property name="name"/> 
    <set name="roles" table="t_user_role"> 
      <key column="user_id"/> 
      <many-to-many class="com.bjpowernode.hibernate.Role" column="role_id" />  
    </set> 
  </class> 
</hibernate-mapping></span> 

<hibernate-mapping> 
  <class name="com.bjpowernode.hibernate.Role" table="t_role"> 
    <id name="id"> 
      <generator class="native"/> 
    </id> 
    <property name="name"/> 
  </class> 
</hibernate-mapping> 

<span style="font-family:KaiTi_GB2312;font-size:18px;">import java.util.Set; 
 
public class User { 
   
  private int id; 
   
  private String name; 
 
  private Set roles; 
   
  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 Set getRoles() { 
    return roles; 
  } 
 
  public void setRoles(Set roles) { 
    this.roles = roles; 
  } 
}</span> 

public class Role { 
 
  private int id; 
   
  private String name; 
   
  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 void testSave1() { 
    Session session = null; 
    try { 
      session = HibernateUtils.getSession(); 
      session.beginTransaction(); 
       
      Role r1 = new Role(); 
      r1.setName("数据录入人员"); 
      session.save(r1); 
       
      Role r2 = new Role(); 
      r2.setName("商务主管"); 
      session.save(r2); 
       
      Role r3 = new Role(); 
      r3.setName("商务经理"); 
      session.save(r3); 
       
      Role r4 = new Role(); 
      r4.setName("项目会计"); 
      session.save(r4); 
       
      User u1 = new User(); 
      u1.setName("张三"); 
      Set u1Roles = new HashSet(); 
      u1Roles.add(r1); 
      u1Roles.add(r2); 
      u1.setRoles(u1Roles); 
      session.save(u1); 
       
      User u2 = new User(); 
      u2.setName("李四"); 
      Set u2Roles = new HashSet(); 
      u2Roles.add(r1); 
      u2Roles.add(r2); 
      u2Roles.add(r3); 
      u2.setRoles(u2Roles); 
      session.save(u2); 
       
      User u3 = new User(); 
      u3.setName("王五"); 
      Set u3Roles = new HashSet(); 
      u3Roles.add(r3); 
      u3Roles.add(r4); 
      u3.setRoles(u3Roles); 
      session.save(u3); 
       
      session.getTransaction().commit(); 
    }catch(Exception e) { 
      e.printStackTrace(); 
      session.getTransaction().rollback(); 
    }finally { 
      HibernateUtils.closeSession(session); 
    } 
  } 

public void testLoad1() { 
    Session session = null; 
    try { 
      session = HibernateUtils.getSession(); 
      session.beginTransaction(); 
      User user = (User)session.load(User.class, 2); 
      System.out.println(user.getName()); 
      for (Iterator iter=user.getRoles().iterator(); iter.hasNext();) { 
        Role role = (Role)iter.next(); 
        System.out.println(role.getName()); 
      } 
      session.getTransaction().commit(); 
    }catch(Exception e) { 
      e.printStackTrace(); 
      session.getTransaction().rollback(); 
    }finally { 
      HibernateUtils.closeSession(session); 
    } 
  }   

<hibernate-mapping> 
  <class name="com.bjpowernode.hibernate.Role" table="t_role"> 
    <id name="id"> 
      <generator class="native"/> 
    </id> 
    <property name="name"/> 
    <set name="users" table="t_user_role"> 
      <key column="role_id" not-null="true"/> 
      <many-to-many class="com.bjpowernode.hibernate.User" column="user_id"/> 
    </set> 
  </class> 
</hibernate-mapping> 

<span style="font-family:KaiTi_GB2312;font-size:18px;"><hibernate-mapping> 
  <class name="com.bjpowernode.hibernate.Role" table="t_role"> 
    <id name="id"> 
      <generator class="native"/> 
    </id> 
    <property name="name"/> 
    <set name="users" table="t_user_role"> 
      <key column="role_id" not-null="true"/> 
      <many-to-many class="com.bjpowernode.hibernate.User" column="user_id"/> 
    </set> 
  </class> 
</hibernate-mapping> 
</span> 

import java.util.Set; 
 
public class Role { 
 
  private int id; 
   
  private String name; 
   
  private Set users; 
   
  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 Set getUsers() { 
    return users; 
  } 
 
  public void setUsers(Set users) { 
    this.users = users; 
  } 
}