hibernate3.jar
hibernate-cglib-repack-2.1_3.jar
slf4j-api-1.5.2.jar
javassist-3.4.GA.jar
jta-1.1.jar
antlr-2.7.6.jar
commons-collections-3.1.jar
dom4j-1.6.1.jar
ejb3-persistence.jar
hibernate-annotations.jar
hibernate-commons-annotations.jar
hibernate-entitymanager.jar
log4j.jar
slf4j-log4j12.jar

package com.hujuan.bean;import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;@Entity
//默认情况下表名称是根据实体类名称创建的，name可以修改表名称
@Table(name="person_table")
public class Person {private Integer id;private String userName;public Person(){}public Person(String userName) {this.userName = userName;}//主键生成策略@GeneratedValue(strategy=GenerationType.AUTO),//值为AUTO表示根据数据库由Hibernate自动选择生成策略，也可以省略写@GeneratedValue//值为IDENTITY表示主键自增长//值为SEQUENCE表示主键采用序列的方式//值为TABLE各个数据库都通用，但效率较低
    @Id  @GeneratedValuepublic Integer getId() {return id;}public void setId(Integer id) {this.id = id;}public String getUserName() {return userName;}public void setUserName(String userName) {this.userName = userName;}
}

<persistence xmlns="http://java.sun.com/xml/ns/persistence"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://java.sun.com/xml/ns/persistence      http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd"version="1.0"><!-- 持久化单元，transaction-type事务类型包括全局事务类型JTA和本地事务类型 RESOURCE_LOCAL--><persistence-unit name="jpa" transaction-type="RESOURCE_LOCAL"><properties><!-- 数据库方言 --><property name="hibernate.dialect" value="org.hibernate.dialect.MySQL5Dialect"/>    <!-- 建表方式，value值为creat-drop时表示创建应用的时候建表，结束应用的时候表自动删除；值为update表示如果映射元数据不存在则建立表，如果映射元数据存在并新增加了字段则会添加到数据库表中 --><property name="hibernate.hbm2ddl.auto" value="update"/><property name="hibernate.connection.driver_class" value="org.gjt.mm.mysql.Driver"/><property name="hibernate.connection.username" value="root"/><property name="hibernate.connection.password" value="root"/><property name="hibernate.connection.url" value="jdbc:mysql://localhost:3306/jpadb"/>      </properties></persistence-unit>
</persistence>

package com.hujuan.test;
import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.Persistence;
import org.junit.BeforeClass;
import org.junit.Test;
import com.hujuan.bean.Person;
public class PersonTest {@BeforeClasspublic static void setUpBeforeClass() throws Exception {}@Testpublic void save(){
//EntityManagerFactory相当于Hibernate中的sessionFactory
//Persistence.createEntityManagerFactory("jpa")与配置文件中的持久化单元名称必须相同EntityManagerFactory factory = Persistence.createEntityManagerFactory("jpa");
//EntityManager相当于Hibernate中sessionEntityManager em = factory.createEntityManager();em.getTransaction().begin();//保存(持久化)方法em.persist(new Person("Tom"));em.getTransaction().commit();em.close();factory.close();}
}