在Student.java中，假设id和name作为它的主键

1、在com.bjsxt.hibernate下单独设计一个类，做为主键类【StudentPK】

package com.bjsxt.hibernate;
 
public class StudentPK implements java.io.Serializable {
       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;
	}
}

2、在Student.java中，建

private StudentPK pk;

public StudentPK getPk() {
		return pk;
	}
	public void setPk(StudentPK pk) {
		this.pk = pk;
	}

3、在HibernateIDTest.java中：

@Test
	public void testStudentSave() {
	    StudentPK pk=new StudentPK();
	    pk.setId(1);
	    pk.setName("zhangsan");

4、在Student.hbm.xml中：

<pre class="html" name="code"><composite-id name="pk" class="com.bjsxt.hibernate.StudentPK">
			<key-property name="id"></key-property>
			<key-property name="name"></key-property>
		</composite-id>