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表关系 如图：

Teacher.java文件：
private int id;
private String name;
private Set teachers;

Student.java文件：
private int id;
private String name;
private Set students;

Teacher.hbm.xml 配置文件内容：
<hibernate-mapping>
<class name="com.bean.Teacher" table="teacher">
   <id name="id" type="int">
    <column name="id"></column>
    <generator class="native"></generator>
   </id>
   <property name="name" type="java.lang.String" column="name"></property>
   <set name="students" table="student_teacher" cascade="all">
    <key column="teacher_id"></key>
    <many-to-many class="com.bean.Student" column="student_id"></many-to-many>
   </set>
   </class>
</hibernate-mapping>

Student.hbm.xml 配置文件内容：
<hibernate-mapping>
<class name="com.bean.Student" table="student">
   <id name="id" type="int">
    <column name="id"></column>
    <generator class="native"></generator>
   </id>
   <property name="name" type="java.lang.String" column="name"></property>
<set name="teachers" table="student_teacher" cascade="all">
    <key column="student_id"></key>
    <many-to-many class="com.bean.Teacher" column="teacher_id"></many-to-many>
   </set>
</class>
</hibernate-mapping>

test测试类部分代码：
List list = session.createQuery("from Teacher").list();
   for(int i=0; i<list.size(); i++){
    Teacher teacher = (Teacher)list.get(i);
    System.out.println("Teacher_name: "+teacher.getName());
    Iterator it = teacher.getStudents().iterator();
    while(it.hasNext()){
     Student student =(Student) it.next();
     System.out.println("student_name: "+student.getName());
    }
    System.out.print("---------------------------\n");

}