<1>persistence.xml放到类路径下的META-INF下面
- <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">
- <!--事务类型:local的还是global(JTA)的事务 -->
- <persistence-unit name="jpa_test" transaction-type="RESOURCE_LOCAL">
- </persistence-unit>
- </persistence>
<2>applicationContext.xml配置
- <?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: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-2.0.xsd
- http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.0.xsd
- http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.0.xsd">
- <!-- 自动装配注解Bean后置处理器 -->
- <bean
- class="org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor"/>
- <!-- JPA注解Bean后置处理器 -->
- <bean
- class="org.springframework.orm.jpa.support.PersistenceAnnotationBeanPostProcessor" />
- <!-- 利用Spring的实体管理器工厂来创建JPA实体管理器 -->
- <bean id="entityManagerFactory"
- class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
- <property name="dataSource" ref="dataSource" />
- <property name="jpaVendorAdapter">
- <bean
- class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter">
- <property name="database" value="MYSQL" />
- <property name="showSql" value="true" />
- <!-- <property name="generateDdl" value="true" /> -->
- </bean>
- </property>
- </bean>
- <bean id="dataSource"
- class="org.springframework.jdbc.datasource.DriverManagerDataSource">
- <property name="driverClassName" value="com.mysql.jdbc.Driver" />
- <property name="url" value="jdbc:mysql://localhost/test?useUnicode=true&characterEncoding=UTF-8" />
- <property name="username" value="root" />
- <property name="password" value="root" />
- </bean>
- <!--
- <bean id="dataSource" class="org.springframework.jndi.JndiObjectFactoryBean">
- <property name="jndiName">
- <value>java:comp/env/jdbc/jpa_ds</value>
- </property>
- </bean>
- -->
- <!-- 声明一个Spring提供的JPA事务管理器,传入的参数是Spring中的实体管理器工厂 -->
- <bean id="transactionManager"
- class="org.springframework.orm.jpa.JpaTransactionManager">
- <property name="entityManagerFactory" ref="entityManagerFactory" />
- </bean>
- <!-- 开启Spring提供的基于注解的声明式事务管理 -->
- <tx:annotation-driven transaction-manager="transactionManager" />
- <!--
- <bean id="transactionInterceptor" class="org.springframework.transaction.interceptor.TransactionInterceptor">
- <property name="transactionManager">
- <ref local="transactionManager"/>
- </property>
- <property name="transactionAttributes">
- <props>
- <prop key="insert*">PROPAGATION_REQUIRED</prop>
- <prop key="update*">PROPAGATION_REQUIRED</prop>
- <prop key="save*">PROPAGATION_REQUIRED</prop>
- <prop key="add*">PROPAGATION_REQUIRED</prop>
- <prop key="update*">PROPAGATION_REQUIRED</prop>
- <prop key="remove*">PROPAGATION_REQUIRED</prop>
- <prop key="delete*">PROPAGATION_REQUIRED</prop>
- <prop key="get*">PROPAGATION_REQUIRED,readOnly</prop>
- <prop key="find*">PROPAGATION_REQUIRED,readOnly</prop>
- <prop key="load*">PROPAGATION_REQUIRED,readOnly</prop>
- <prop key="change*">PROPAGATION_REQUIRED</prop>
- <prop key="*">PROPAGATION_REQUIRED,readOnly</prop>
- </props>
- </property>
- </bean>
- <bean id="beanNameAutoProxyCreator"
- class="org.springframework.aop.framework.autoproxy.BeanNameAutoProxyCreator">
- <property name="beanNames">
- <list>
- <value>*Service</value>
- <value>*Dao</value>
- </list>
- </property>
- <property name="interceptorNames">
- <list>
- <value>transactionInterceptor</value>
- </list>
- </property>
- </bean>
- -->
- <!-- 直接使用Spring的 JpaTemplate -->
- <bean id="jpaTemplate" class="org.springframework.orm.jpa.JpaTemplate">
- <property name="entityManagerFactory" ref="entityManagerFactory" />
- </bean>
- <bean id="personDao" class="quickstart.dao.impl.PersonDaoImpl" autowire="byName"/>
- <bean id="peopleService" class="quickstart.service.impl.PeopleServiceImpl"/>
- </beans>
<3>web.xml文件
- <?xml version="1.0" encoding="UTF-8"?>
- <web-app version="2.4"
- xmlns="http://java.sun.com/xml/ns/j2ee"
- xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
- xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
- http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
- <display-name>jpa_test</display-name>
- <context-param>
- <param-name>contextConfigLocation</param-name>
- <param-value>
- classpath:applicationContext.xml
- </param-value>
- </context-param>
- <listener>
- <listener-class>
- org.springframework.web.context.ContextLoaderListener
- </listener-class>
- </listener>
- <!-- 配置字符编码过滤器 -->
- <filter>
- <filter-name>encoding</filter-name>
- <filter-class>
- org.springframework.web.filter.CharacterEncodingFilter
- </filter-class>
- <init-param>
- <param-name>encoding</param-name>
- <param-value>UTF-8</param-value>
- </init-param>
- </filter>
- <filter-mapping>
- <filter-name>encoding</filter-name>
- <url-pattern>/*</url-pattern>
- </filter-mapping>
- <welcome-file-list>
- <welcome-file>index.jsp</welcome-file>
- </welcome-file-list>
- </web-app>
<4>泛型dao定义
- public interface GenericDao<T, ID extends Serializable> {
- public T save(T entity);
- public T update(T entity);
- public Integer updateBySql(final String sql);
- public void delete(T entity);
- public T findById(ID id);
- public List findByJPQL(String jpql);
- public List findBySQL(String sql);
- public List findAll();
- public int findRowCount();
- }
- public class GenericDaoImpl<T, ID extends Serializable> extends JpaDaoSupport
- implements GenericDao<T, ID> {
- private Class persistentClass;
- public GenericDaoImpl() {
- this.persistentClass = (Class) ((ParameterizedType) getClass()
- .getGenericSuperclass()).getActualTypeArguments()[0];
- }
- public Class getPersistentClass() {
- return persistentClass;
- }
- public T save(Object entity) {
- getJpaTemplate().persist(entity);
- return (T)entity;
- }
- public T update(Object entity) {
- getJpaTemplate().merge(entity);
- return (T)entity;
- }
- public Integer updateBySql(final String sql){
- return (Integer)getJpaTemplate().execute(new JpaCallback(){
- public Integer doInJpa(EntityManager em) throws PersistenceException{
- return em.createNativeQuery(sql).executeUpdate();
- }
- });
- }
- public void delete(Object entity) {
- getJpaTemplate().remove(entity);
- }
- public T findById(Serializable id) {
- return (T)getJpaTemplate().find(this.getPersistentClass(), id);
- }
- //要立即抓取时用"JOIN FETCH"
- public List findByJPQL(String jpql) {
- return getJpaTemplate().find(jpql);
- }
- /**
- * 返回:list中装入的是对象数组(Object[])
- */
- public List findBySQL(final String sql) {
- return getJpaTemplate().executeFind(new JpaCallback(){
- public List doInJpa(EntityManager em) throws PersistenceException{
- return em.createNativeQuery(sql).getResultList();
- }
- });
- }
- public List findAll() {
- return getJpaTemplate().executeFind(new JpaCallback() {
- public Object doInJpa(EntityManager em) throws PersistenceException {
- StringBuffer jpql = new StringBuffer("from ");
- jpql.append(getPersistentClass().getName());
- jpql.append(" obj");
- return em.createQuery(jpql.toString()).getResultList();
- }
- });
- }
- public int findRowCount() {
- return ((Long) getJpaTemplate().execute(new JpaCallback() {
- public Object doInJpa(EntityManager em) throws PersistenceException {
- StringBuffer strBuff = new StringBuffer("select count(*) from ");
- strBuff.append(getPersistentClass().getName());
- return em.createQuery(strBuff.toString()).getResultList().get(0);
- }
- })).intValue();
- }
- }