JPA環境搭建

轉載地址：http://my.oschina.net/u/1765238/blog/303425

1.首先導入jar包放入lib目錄下：

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hibernate3.jar lib\jpa\hibernate-jpa-2.0-api-1.0.0.Final.jar lib\required\antlr-2.7.6.jar lib\required\commons-collections-3.1.jar lib\required\dom4j-1.6.1.jar lib\required\javassist-3.12.0.GA.jar lib\required\jta-1.1.jar lib\required\slf4j-api-1.6.1.jar   另外，還需要你用到的數據庫的JDBC驅動程序包。本文用的是Mysql，因此還有一個mysql-connector-java-5.1.12-bin.jar。

2.新建配置文件 persistence.xml：

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1	src下必須有一個META-INF文件夾，而且persistence.xml必須在其內,文件名必須相同

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<?xml version="1.0" encoding="UTF-8"?> <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_2_0.xsd"               version="2.0">        <persistence-unit name="chenyue" transaction-type="RESOURCE_LOCAL">       <!-- <jta-data-source>java:/DefaultDS</jta-data-source> -->       <properties>          <property name="hibernate.dialect" value="org.hibernate.dialect.MySQL5Dialect"/>          <property name="hibernate.hbm2ddl.auto" value="update"/>          <property name="hibernate.connection.driver_class" value="com.mysql.jdbc.Driver"/>          <property name="hibernate.connection.username" value="root"/>          <property name="hibernate.connection.password" value="123"/>          <property name="hibernate.connection.url" value="jdbc:mysql://localhost:3306/chydb?useUnicode=true&amp;characterEncoding=UTF-8"/>        </properties>        </persistence-unit> </persistence>

3.新建基本類用來測試：

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package com.itcast.bean.product;   import javax.persistence.Entity; import javax.persistence.GeneratedValue; import javax.persistence.GenerationType; import javax.persistence.Id;   @Entity     //標註其是一個實體bean public class ProductType {     private Integer typeid;           @Id     //對象標示符     @GeneratedValue(strategy=GenerationType.AUTO)   //數據庫中採用主鍵自增長     public Integer getTypeid() {         return typeid;     }       public void setTypeid(Integer typeid) {         this.typeid = typeid;     } }

4.用JUnit單元來測試：

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package junit.test;   import javax.persistence.EntityManagerFactory; import javax.persistence.Persistence;   import org.junit.BeforeClass; import org.junit.Test;   public class ProductTest {     @BeforeClass     public static void setUpBeforeClass(){         System.out.println("setUpBeforeClass");     }           @Test     public void jpaTest(){         EntityManagerFactory factory= Persistence.createEntityManagerFactory("itcast");         System.out.println(factory.toString());     } }