班級類package hibernate;import java.io.Serializable;import java.util.HashSet;import java.util.Set;public class Grade implements Serializable { private int gid; private String sname; private String gdesc; private Set<student1> students=new HashSet<student1>(); public Grade(int gid, String sname, String gdesc, Set<student1> students) { super(); this.gid = gid; this.sname = sname; this.gdesc = gdesc; this.students = students; } public Grade() { super(); } public int getGid() { return gid; } public void setGid(int gid) { this.gid = gid; } public String getSname() { return sname; } public void setSname(String sname) { this.sname = sname; } public String getGdesc() { return gdesc; } public void setGdesc(String gdesc) { this.gdesc = gdesc; } public Set<student1> getStudents() { return students; } public void setStudents(Set<student1> students) { this.students = students; } public Grade(String sname, String gdesc) { super(); this.sname = sname; this.gdesc = gdesc; }}學生類package hibernate;import java.io.Serializable;public class student1 implements Serializable{ private int sid; private String sname; private String sex; public int getSid() { return sid; } public void setSid(int sid) { this.sid = sid; } public String getSname() { return sname; } public void setSname(String sname) { this.sname = sname; } public String getSex() { return sex; } public void setSex(String sex) { this.sex = sex; } public student1(String sname, String sex) { super(); this.sname = sname; this.sex = sex; } }班級hbm類<?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 2017-3-25 22:16:53 by Hibernate Tools 3.5.0.Final --><hibernate-mapping>? ? <class name="hibernate.Grade" table="grade1">? ? ? ? <id name="gid" type="int">? ? ? ? ? ? <column name="GID" />? ? ? ? ? ? <generator class="increment" />? ? ? ? </id>? ? ? ? <property name="sname" type="java.lang.String">? ? ? ? ? ? <column name="SNAME" />? ? ? ? </property>? ? ? ? <property name="gdesc" type="java.lang.String">? ? ? ? ? ? <column name="GDESC" />? ? ? ? </property>? ? ? ? <set name="students" table="student1" inverse="false" lazy="true">? ? ? ? ? ? <key>? ? ? ? ? ? ? ? <column name="gid" />? ? ? ? ? ? </key>? ? ? ? ? ? <one-to-many class="hibernate.student1" />? ? ? ? </set>? ? </class></hibernate-mapping>? 學生hbm<?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 2017-3-25 22:16:53 by Hibernate Tools 3.5.0.Final --><hibernate-mapping>? ? <class name="hibernate.student1" table="student1">? ? ? ? <id name="sid" type="int">? ? ? ? ? ? <column name="SID" />? ? ? ? ? ? <generator class="increment" />? ? ? ? </id>? ? ? ? <property name="sname" type="java.lang.String">? ? ? ? ? ? <column name="SNAME" />? ? ? ? </property>? ? ? ? <property name="sex" type="java.lang.String">? ? ? ? ? ? <column name="SEX" />? ? ? ? </property>? ? </class></hibernate-mapping>配置文檔<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN" "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd"><hibernate-configuration>? ? <session-factory>? ? <property name="connection.username">root</property>? ? <property name="connection.password">123456</property>? ? <property name="connection.driver_name">com.mysql.jdbc.Driver</property>? ? <property name="connection.url">jdbc:mysql://localhost:3306/student3?useUnicode=true&amp;characterEncoding=UTF-8</property>? ? ?<property name="dialect">org.hibernate.dialect.MySQL5InnoDBDialect </property>?? ? ?? ? ?<property name="show_sql">true</property>? ? ?<property name="format_sql">true</property>? ? ?<property name="hbm2ddl.auto">create</property>? ? <mapping resource="student1.hbm.xml"/>? ? ?<mapping resource="Grade.hbm.xml"/>? ? </session-factory></hibernate-configuration>測試類package hibernate;import java.util.Date;import org.hibernate.Session;import org.hibernate.SessionFactory;import org.hibernate.Transaction;import org.hibernate.boot.registry.StandardServiceRegistryBuilder;import org.hibernate.cfg.Configuration;import org.hibernate.service.ServiceRegistry;import org.junit.After;import org.junit.Before;import org.junit.Test;public class StudentsTest { ? private SessionFactory sessionFactory; ? private Session session; ? private Transaction transaction; @Before public void init(){ //創(chuàng)建配置對象 Configuration config=new Configuration().configure(); config.addClass(Grade.class); config.addClass(student1.class); //創(chuàng)建服務注冊對象 ServiceRegistry serviceRegistry =new StandardServiceRegistryBuilder().applySettings(config.getProperties()).build(); //創(chuàng)建會話工廠對象 sessionFactory=config.buildSessionFactory(serviceRegistry); //會話對象 session=sessionFactory.openSession(); //開啟事物 transaction=session.beginTransaction(); } @After public void destroy(){ transaction.commit(); transaction.commit();//提交事物 session.close();//關閉會話 sessionFactory.close();//關閉會話工廠 } @Test public void testSaveStudent(){ Grade g=new Grade("java二班","java軟件開發(fā)一班"); student1 stu1=new student1("王五","男"); student1 stu2=new student1("趙六","男"); g.getStudents().add(stu1); g.getStudents().add(stu2); session.save(g); session.save(stu1); session.save(stu2); } @Test public void testsearchGrade(){ Grade grade=(Grade)session.get(Grade.class, 1); System.out.println(grade); }只要測試?testsearchGrade() 方法 數據表就會把以前的數據清空