<dependency> <groupId>org.hibernate</groupId> <artifactId>hibernate-entitymanager</artifactId> <version>4.2.8.Final</version> </dependency>
2. spring-jpa-hibernate.xml
<?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:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.2.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.2.xsd"> <!-- scan all beans and inject dependence --> <context:component-scan base-package="com.myproject"/> <!-- add aop support --> <aop:aspectj-autoproxy/> <!-- jpa --> <bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalEntityManagerFactoryBean"> <property name="persistenceUnitName" value="example"/> </bean> <!-- add Transaction support --> <bean id="txManager" class="org.springframework.orm.jpa.JpaTransactionManager"> <property name="entityManagerFactory" ref="entityManagerFactory"/> </bean> <!-- scan transaction annotation --> <tx:annotation-driven transaction-manager="txManager"/> </beans>
3. 在类路径下创建文件夹“META-INF”, 加入文件persistence.xml。 完整的路径是 classpath:META-INF/persistence.xml, 这是jpa的默认配置文件。
<?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="example" transaction-type="RESOURCE_LOCAL"> <properties> <property name="hibernate.dialect" value="org.hibernate.dialect.MySQL5Dialect"/> <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="admin"/> <property name="hibernate.connection.url" value="jdbc:mysql://szOIBnchmrkAP1:3306/test?useUnicode=true&characterEncoding=UTF-8"/> <property name="hibernate.max_fetch_depth" value="3"/> <!-- create table automatically? --> <property name="hibernate.hbm2ddl.auto" value="update"/> </properties> </persistence-unit> </persistence>
4. Entity对象
package com.myproject.example.vo; import javax.persistence.Column; import javax.persistence.Entity; import javax.persistence.GeneratedValue; import javax.persistence.Id; @Entity public class Account { @Id @GeneratedValue //generated automatically private long id; @Column(length=20, nullable=false) private String username; @Column(length=20, nullable=false) private String password; public long getId() { return id; } public void setId(long id) { this.id = id; } public String getUsername() { return username; } public void setUsername(String username) { this.username = username; } public String getPassword() { return password; } public void setPassword(String password) { this.password = password; } }
5.Dao文件
package com.myproject.example.dao.jpa; import java.util.List; import javax.persistence.EntityManager; import javax.persistence.PersistenceContext; import javax.persistence.Query; import org.springframework.stereotype.Repository; import com.myproject.example.dao.AccountDao; import com.myproject.example.vo.Account; @Repository public class AccountDaoBean implements AccountDao { @PersistenceContext EntityManager em; @Override public Account queryAccountById(int id) { return em.find(Account.class, id); } @SuppressWarnings("unchecked") @Override public List<Account> queryAccount(Account account) { Query q = em.createQuery("select a from Account a where a.username like ?"); q.setParameter(1, "%"+account.getUsername()+"%"); return q.getResultList(); } @Override public int updateAccount(Account account) { em.merge(account); return 0; } @Override public int insertAccount(Account account) { em.persist(account); return 0; } @Override public int deleteAccount(int id) { em.remove(em.getReference(Account.class, id)); return 0; } }
6. Service对象包含事务管理
package com.myproject.example.service; import java.util.List; import javax.annotation.Resource; import org.springframework.stereotype.Service; import org.springframework.transaction.annotation.Propagation; import org.springframework.transaction.annotation.Transactional; import com.myproject.example.dao.AccountDao; import com.myproject.example.vo.Account; @Service @Transactional public class AccountService { @Resource private AccountDao accountDao; //don't need to add transaction in query method @Transactional(propagation=Propagation.NOT_SUPPORTED) public Account Login(String username, String password){ System.out.println(username + " want to login."); Account account = new Account(); account.setUsername(username); account.setPassword(password); List<Account> list= accountDao.queryAccount(account); if(list.size()==1) return list.get(0); else return null; } //in method which already has "throws", we must add rollbackFor if want to rollback for this exception, //otherwise the method will not be rollback @Transactional(rollbackFor=Exception.class) public void reqister(Account account) { accountDao.insertAccount(account); //throw new RuntimeException("==no register"); } }
7.web.xml
<?xml version="1.0" encoding="UTF-8"?> <web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"> <context-param> <!-- location of spring config --> <param-name>contextConfigLocation</param-name> <param-value>classpath:spring.xml</param-value> </context-param> <!-- initialize spring context--> <listener> <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class> </listener> <servlet> <servlet-name>springmvc</servlet-name> <servlet-class> org.springframework.web.servlet.DispatcherServlet </servlet-class> <init-param> <param-name>contextConfigLocation</param-name> <param-value>classpath:springmvc.xml</param-value> </init-param> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>springmvc</servlet-name> <url-pattern>*.do</url-pattern> </servlet-mapping> <welcome-file-list> <welcome-file>/jsp/index.jsp</welcome-file> </welcome-file-list> <!-- 解决因EntityManager关闭导致的延迟加载异常--> <filter> <filter-name>openEntityManagerInViewFilter</filter-name> <filter-class>org.springframework.orm.jpa.support.OpenEntityManagerInViewFilter</filter-class> </filter> <filter-mapping> <filter-name>openEntityManagerInViewFilter</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> </web-app>
8.单元测试
@Test public void test(){ try { ApplicationContext ac=new ClassPathXmlApplicationContext("spring-jpa-hibernate.xml"); AccountService accountService =(AccountService)ac.getBean("accountService"); Account account = new Account(); account.setUsername("tom"); account.setPassword("117"); accountService.reqister(account); } catch (Exception e) { e.printStackTrace(); } }