JPA系列十四：整合Spring

迈不过友情╰ 2022-02-09 11:43 315阅读 0赞

三种整合方式：  
 1、LocalEntityManagerFactoryBean：适用于那些仅使用 JPA 进行数据访问的项目，该 FactoryBean 将根据JPA PersistenceProvider 自动检测配置文件进行工作，一般从“META-INF/persistence.xml”读取配置信息，这种方式最简单，但不能设置 Spring 中定义的DataSource，且不支持 Spring 管理的全局事务。  
 2、从JNDI中获取：用于从 Java EE 服务器获取指定的EntityManagerFactory，这种方式在进行 Spring 事务管理时一般要使用 JTA 事务管理。  
 3、LocalContainerEntityManagerFactoryBean：适用于所有环境的 FactoryBean，能全面控制 EntityManagerFactory 配置,如指定 Spring 定义的 DataSource 等等。  
整合步骤：  
1、引入依赖

<dependencies>
            
            <dependency>
                <groupId>org.hibernate.common</groupId>
                <artifactId>hibernate-commons-annotations</artifactId>
                <version>4.0.2.Final</version>
            </dependency>
            <dependency>
                <groupId>org.hibernate</groupId>
                <artifactId>hibernate-core</artifactId>
                <version>4.1.9.Final</version>
            </dependency>
            <dependency>
                <groupId>org.hibernate</groupId>
                <artifactId>hibernate-entitymanager</artifactId>
                <version>4.1.9.Final</version>
            </dependency>
            <dependency>
                <groupId>org.hibernate.javax.persistence</groupId>
                <artifactId>hibernate-jpa-2.0-api</artifactId>
                <version>1.0.1.Final</version>
            </dependency>
            <dependency>
                <groupId>org.hibernate</groupId>
                <artifactId>hibernate-validator</artifactId>
                <version>4.2.0.Final</version>
            </dependency>
            
            <dependency>
                <groupId>net.sf.ehcache</groupId>
                <artifactId>ehcache-core</artifactId>
                <version>2.4.3</version>
            </dependency>
            <dependency>
                <groupId>org.hibernate</groupId>
                <artifactId>hibernate-ehcache</artifactId>
                <version>4.2.4.Final</version>
            </dependency>
            <dependency>
                <groupId>org.jboss.logging</groupId>
                <artifactId>jboss-logging</artifactId>
                <version>3.1.0.GA</version>
            </dependency>
            <dependency>
                <groupId>org.slf4j</groupId>
                <artifactId>slf4j-api</artifactId>
                <version>1.6.0</version>
            </dependency>
            <dependency>
                <groupId>org.jboss.spec.javax.transaction</groupId>
                <artifactId>jboss-transaction-api_1.1_spec</artifactId>
                <version>1.0.1.Final</version>
            </dependency>
            <dependency>
                <groupId>org.eclipse.persistence</groupId>
                <artifactId>javax.persistence</artifactId>
                <version>2.1.0-RC2</version>
            </dependency>
            <dependency>
                <groupId>dom4j</groupId>
                <artifactId>dom4j</artifactId>
                <version>1.6.1</version>
            </dependency>
            <dependency>
                <groupId>antlr</groupId>
                <artifactId>antlr</artifactId>
                <version>2.7.7</version>
            </dependency>
            <dependency>
                <groupId>org.javassist</groupId>
                <artifactId>javassist</artifactId>
                <version>3.15.0-GA</version>
            </dependency>
            
            <dependency>
                <groupId>mysql</groupId>
                <artifactId>mysql-connector-java</artifactId>
                <version>5.1.18</version>
            </dependency>
            <dependency>
                <groupId>org.jboss.logging</groupId>
                <artifactId>jboss-logging</artifactId>
                <version>3.1.0.CR2</version>
            </dependency>
            <dependency>
                <groupId>commons-collections</groupId>
                <artifactId>commons-collections</artifactId>
                <version>3.1</version>
            </dependency>
            <dependency>
                <groupId>commons-logging</groupId>
                <artifactId>commons-logging</artifactId>
                <version>1.1.2</version>
            </dependency>
            
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-core</artifactId>
                <version>4.0.0.RELEASE</version>
            </dependency>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-beans</artifactId>
                <version>4.0.0.RELEASE</version>
            </dependency>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-context</artifactId>
                <version>4.0.0.RELEASE</version>
            </dependency>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-context-support</artifactId>
                <version>4.0.0.RELEASE</version>
            </dependency>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-expression</artifactId>
                <version>4.0.0.RELEASE</version>
            </dependency>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-aop</artifactId>
                <version>4.0.0.RELEASE</version>
            </dependency>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-orm</artifactId>
                <version>4.0.0.RELEASE</version>
            </dependency>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-test</artifactId>
                <version>4.0.0.RELEASE</version>
            </dependency>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-web</artifactId>
                <version>4.0.0.RELEASE</version>
            </dependency>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-webmvc</artifactId>
                <version>4.0.0.RELEASE</version>
            </dependency>
            <dependency>
                <groupId>cglib</groupId>
                <artifactId>cglib</artifactId>
                <version>3.1</version>
            </dependency>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-aspects</artifactId>
                <version>4.0.0.RELEASE</version>
            </dependency>
            <dependency>
                <groupId>org.aspectj</groupId>
                <artifactId>aspectjrt</artifactId>
                <version>1.6.6</version>
            </dependency>
            <dependency>
                <groupId>org.aspectj</groupId>
                <artifactId>aspectjweaver</artifactId>
                <version>1.6.6</version>
            </dependency>
            <dependency>
                <groupId>com.mchange</groupId>
                <artifactId>c3p0</artifactId>
                <version>0.9.2</version>
            </dependency>
            
            <dependency>
                <groupId>junit</groupId>
                <artifactId>junit</artifactId>
                <version>4.4</version>
            </dependency>
        </dependencies>

2、创建db.properties

jdbc.user=root
    jdbc.password=root
    jdbc.driverClass=com.mysql.jdbc.Driver
    jdbc.jdbcUrl=jdbc:mysql://localhost:3306/jpa

3、创建spring配置文件

<?xml version="1.0" encoding="UTF-8"?>
    <beans xmlns="http://www.springframework.org/schema/beans"
    	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    	xmlns:context="http://www.springframework.org/schema/context"
    	xmlns:tx="http://www.springframework.org/schema/tx"
    	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
    		http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd
    		http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd">
    
    	
    	<context:component-scan base-package="com.atguigu.jpa"></context:component-scan>
    
    	
    	<context:property-placeholder location="classpath:db.properties"/>
    
    	<bean id="dataSource"
    		class="com.mchange.v2.c3p0.ComboPooledDataSource">
    		<property name="user" value="${jdbc.user}"></property>
    		<property name="password" value="${jdbc.password}"></property>
    		<property name="driverClass" value="${jdbc.driverClass}"></property>
    		<property name="jdbcUrl" value="${jdbc.jdbcUrl}"></property>	
    		
    		
    	</bean>
    	
    	
    	<bean id="entityManagerFactory"
    		class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
    		<property name="dataSource" ref="dataSource"></property>
    		
    		<property name="jpaVendorAdapter">
    			<bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter"></bean>
    		</property>	
    		
    		<property name="packagesToScan" value="com.atguigu.jpa.spring.entities"></property>
    		
    		<property name="jpaProperties">
    			<props>
    				<prop key="hibernate.show_sql">true</prop>
    				<prop key="hibernate.format_sql">true</prop>
    				<prop key="hibernate.hbm2ddl.auto">update</prop>
    			</props>
    		</property>
    	</bean>
    	
    	
    	<bean id="transactionManager"
    		class="org.springframework.orm.jpa.JpaTransactionManager">
    		<property name="entityManagerFactory" ref="entityManagerFactory"></property>	
    	</bean>
    	
    	
    	<tx:annotation-driven transaction-manager="transactionManager"/>
    </beans>

4、创建实体类Person

@Table(name="JPA_PERSONS")
    @Entity
    public class Person {
    
    	private Integer id;
    	private String lastName;
    
    	private String email;
    	private int age;
    
    	@GeneratedValue
    	@Id
    	public Integer getId() {
    		return id;
    	}
    
    	public void setId(Integer id) {
    		this.id = id;
    	}
    
    	@Column(name="LAST_NAME")
    	public String getLastName() {
    		return lastName;
    	}
    
    	public void setLastName(String lastName) {
    		this.lastName = lastName;
    	}
    
    	public String getEmail() {
    		return email;
    	}
    
    	public void setEmail(String email) {
    		this.email = email;
    	}
    
    	public int getAge() {
    		return age;
    	}
    
    	public void setAge(int age) {
    		this.age = age;
    	}
    }

5、创建类PersonDao

@Repository
    public class PersonDao {
    	
    	//通过 @PersistenceContext 注解来标记成员变量。以获取到和当前事务关联的 EntityManager 对象
    	@PersistenceContext
    	private EntityManager entityManager;
    	
    	public void save(Person person){
    		entityManager.persist(person);
    	}
    	
    }

6、创建类PersonService

@Service
    public class PersonService {
    	
    	@Autowired
    	private PersonDao personDao;
    	
    	@Transactional
    	public void savePersons(Person p1, Person p2){
    		personDao.save(p1);
    		personDao.save(p2);
    	}
    }

测试：

public class JPATest {
    	private ApplicationContext ctx = null;
    	private PersonService personService = null;
    	
    	{
    		ctx = new ClassPathXmlApplicationContext("applicationContext.xml");
    		personService = ctx.getBean(PersonService.class);
    	}
    	
    	@Test
    	public void testPersonService(){
    		Person p1 = new Person();
    		p1.setAge(11);
    		p1.setEmail("aa@163.com");
    		p1.setLastName("AA");
    		Person p2 = new Person();
    		p2.setAge(12);
    		p2.setEmail("bb@163.com");
    		p2.setLastName("BB");
    		System.out.println(personService.getClass().getName());
    		personService.savePersons(p1, p2);
    	}
    	
    	@Test
    	public void testDataSource() throws SQLException {
    		DataSource dataSource = ctx.getBean(DataSource.class);
    		System.out.println(dataSource.getConnection());
    	}
    }

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