如果在链接表（STUDENT_COURSE）上添加额外的字段，则必须根据skaffman的答案或以下所示选择其他方法。
有一种方法可以根据以下条件使链接表（STUDENT_COURSE）表现为@Embeddable：
@Embeddablepublic class JoinedStudentCourse { // Lets suppose you have added this field @Column(updatable=false) private Date joinedDate; @ManyToOne(fetch=FetchType.LAZY) @JoinColumn(name="STUDENT_ID", insertable=false, updatable=false) private Student student; @ManyToOne(fetch=FetchType.LAZY) @JoinColumn(name="COURSE_ID", insertable=false, updatable=false) private Course course; // getter's and setter's public boolean equals(Object instance) { if(instance == null) return false; if(!(instance instanceof JoinedStudentCourse)) return false; JoinedStudentCourse other = (JoinedStudentCourse) instance; if(!(student.getId().equals(other.getStudent().getId())) return false; if(!(course.getId().equals(other.getCourse().getId())) return false; // ATT: use immutable fields like joinedDate in equals() implementation if(!(joinedDate.equals(other.getJoinedDate())) return false; return true; } public int hashpre() { // hashpre implementation }}因此，您将同时参加学生和课程课程
public class Student { @CollectionOfElements @JoinTable( table=@Table(name="STUDENT_COURSE"), joinColumns=@JoinColumn(name="STUDENT_ID") ) private Set<JoinedStudentCourse> joined = new HashSet<JoinedStudentCourse>();}public class Course { @CollectionOfElements @JoinTable( table=@Table(name="STUDENT_COURSE"), joinColumns=@JoinColumn(name="COURSE_ID") ) private Set<JoinedStudentCourse> joined = new HashSet<JoinedStudentCourse>();}请记住：@Embeddable类的生命周期绑定到拥有的实体类（Student和Course），因此请多加注意。
建议：由于@ManyToMany映射中的某些限制-
级联操作，Hibernate团队支持这两种方法（@OneToMany（skaffman的答案）或@CollectionsOfElements）。
问候，
