Spring4 + Hibernate4集成Spring Data JPA

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1.添加依赖包:

spring和hibernate的包还是好找的,记得加入hibernate/lib/jpa里面的jar包,接着最麻烦的事jpa了,需要添加spring-data的jar包了,给个网址吧:下载spring-data

我们需要的是spring-data-commons和spring-data-jpa,记得 如果包倒入的不对的话,会出现包冲突的一场,我个人使用的是commoms-1.5.0和jpa-1.3.3,这两个是兼容的,还需要的是slf4j的jar,因为这个也是一个依赖包。附上整个项目的包结构吧:



2.配置xml

先是配置applicationContext.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:tx="http://www.springframework.org/schema/tx"       xmlns:aop="http://www.springframework.org/schema/aop"       xmlns:jpa="http://www.springframework.org/schema/data/jpa"       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.xsd       http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd       http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd       http://www.springframework.org/schema/data/jpa http://www.springframework.org/schema/data/jpa/spring-jpa-1.2.xsd">    <!--自动扫描包-->    <context:component-scan base-package="cn.limbo">        <!--不要将Controller扫进来,否则aop无法使用-->        <context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller"/>    </context:component-scan>    <!--使Aspect注解起作用,自动为匹配的类生成代理对象-->    <aop:aspectj-autoproxy proxy-target-class="true"/>    <!--引入properties-->    <context:property-placeholder location="classpath:hibernate.properties"/>    <!--配置数据源-->    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">        <property name="user" value="${dataSource.username}"/>        <property name="password" value="${dataSource.password}"/>        <property name="jdbcUrl" value="${dataSource.url}"/>        <property name="driverClass" value="${dataSource.driverClassName}"/>    </bean>    <!--<!–sessionFactory–>-->    <!--<bean id="sessionFactory" class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">-->    <!--<!– 配置数据源属性 –>-->    <!--<property name="dataSource" ref="dataSource"/>-->    <!--<!– 配置扫描的实体包(pojo) –>-->    <!--<property name="namingStrategy">-->    <!--<bean class="org.hibernate.cfg.ImprovedNamingStrategy"/>-->    <!--</property>-->    <!--<property name="packagesToScan" value="cn.limbo.entity"/>-->    <!--<property name="hibernateProperties">-->    <!--<props>-->    <!--<prop key="hibernate.dialect">org.hibernate.dialect.MySQL5InnoDBDialect</prop>-->    <!--<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="persistenceProvider"          class="org.hibernate.ejb.HibernatePersistence"/>    <bean id="jpaVendorAdapter" class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter">        <property name="database" value="MYSQL"/>    </bean>    <bean id="jpaDialect" class="org.springframework.orm.jpa.vendor.HibernateJpaDialect"/>    <!--jpa工厂-->    <bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">        <!--数据源-->        <property name="dataSource" ref="dataSource"/><!--持久层提供者-->        <property name="persistenceProvider" ref="persistenceProvider"/>        <!--适配器-->        <property name="jpaVendorAdapter" ref="jpaVendorAdapter"/>        <property name="jpaDialect" ref="jpaDialect"/>        <property name="jpaProperties">            <props>                <prop key="hibernate.dialect">${dataSource.dialect}</prop>                <prop key="hibernate.hbm2ddl.auto">${dataSource.hbm2ddl.auto}</prop>                <prop key="hibernate.show_sql">${dataSource.show_sql}</prop>                <prop key="hibernate.format_sql">${dataSource.format_sql}</prop>            </props>        </property>        <property name="packagesToScan">            <list>                <value>cn.limbo.entity</value>            </list>        </property>    </bean>    <jpa:repositories base-package="cn.limbo.dao"                      entity-manager-factory-ref="entityManagerFactory"                      transaction-manager-ref="transactionManager"/>    <!-- 配置Hibernate 的事物管理器 -->    <bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">        <property name="entityManagerFactory" ref="entityManagerFactory"/>    </bean>    <tx:annotation-driven transaction-manager="transactionManager"/></beans>
可以看到,如果引入jpa之后原先的hibernate的sessionFactory的bean配置就不需要了,转而是配置entityManagerFactory了,而且事务的管理的bean也变成了JpaTransactionManager了,这个比较简单。
如果项目是web项目的话,一定一定要记得更改web.xml原先对sessionFactory的fliter,否则项目启动的时候会报找不到sessionFactory的错误,诶,当时有点粗心了。
web.xml
<?xml version="1.0" encoding="UTF-8"?><web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"         version="3.1">        <display-name>Google Authenticator</display-name>    <welcome-file-list>        <welcome-file>login.html</welcome-file>    </welcome-file-list>    <!--配置IOC容器-->    <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SpringMVC 的 DispatcherServlet-->    <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:spring-mvc.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>    <!-- 配置编码方式过滤器,注意一点:要配置在所有过滤器的前面 -->    <filter>        <filter-name>characterEncodingFilter</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>characterEncodingFilter</filter-name>        <url-pattern>*.do</url-pattern>    </filter-mapping>    <!-- 为了使用SpringMVC框架实现REST风格,需要配置  HiddenHttpMethodFilter-->    <filter>        <filter-name>hiddenHttpMethodFilter</filter-name>        <filter-class>org.springframework.web.filter.HiddenHttpMethodFilter</filter-class>    </filter>    <filter-mapping>        <filter-name>hiddenHttpMethodFilter</filter-name>        <url-pattern>*.do</url-pattern>    </filter-mapping>    <!--hibernate对对象的管理是基于session的,如果开启了延迟加载,    对于关联对象的查询可能会在渲染jsp的时候才发生,但是这个时候hibernate的当前session默认已经关闭了,    就会抛异常,所以我们经常需要hibernate在渲染jsp页面的时候还开着session,    这就需要在web.xml中配置一个拦截所有请求的filter-->    <!--如果是hibernate的话这样配置-->    <!--<filter>-->        <!--<filter-name>hibernateFilter</filter-name>-->        <!--<filter-class>org.springframework.orm.hibernate4.support.OpenSessionInViewFilter</filter-class>-->    <!--</filter>-->    <!--<filter-mapping>-->        <!--<filter-name>hibernateFilter</filter-name>-->        <!--<url-pattern>*.do</url-pattern>-->    <!--</filter-mapping>-->    <!--jpa配置的方式,需要配置entityManager-->    <filter>        <filter-name>entityManagerInViewFilter</filter-name>        <filter-class>org.springframework.orm.jpa.support.OpenEntityManagerInViewFilter</filter-class>    </filter>    <filter-mapping>        <filter-name>entityManagerInViewFilter</filter-name>        <url-pattern>*.do</url-pattern>    </filter-mapping></web-app>

3.编写dao层

经过上面的配置之后,已经可以使用jpa了,接下来就是编写dao层的东西了
先贴上我的dao层实现
package cn.limbo.dao;import cn.limbo.entity.User;import org.springframework.data.jpa.repository.Modifying;import org.springframework.data.jpa.repository.Query;import org.springframework.data.repository.RepositoryDefinition;import org.springframework.data.repository.query.Param;import java.util.List;/** * user表的数据操作 * Created by limbo on 2016/11/26. */@RepositoryDefinition(domainClass = User.class, idClass = Integer.class)public interface UserDao{    @Query("select u from User u where u.ID = ?1")    public User getUserByID(int ID);    @Query("select u from User u where u.name = ?1")    public User getUserByName(String userName);    @Query("select u from User u")    public List<User> getAllUsers();    public void save(User user);    @Modifying    @Query("delete from User u where u.ID = ?1")    public void delete(int ID);    @Modifying    @Query("update User u set u.name = :name , u.password = :password where u.ID = :ID")    public void update(@Param("ID") Integer ID ,@Param("name")  String name , @Param("password") String password);}

实现jpa的方式有两种,一个是集成Repository<T,ID>接口,其中T表示你要操作的实体类,而ID表示实体类里面的ID的类型;还有一种就是加上注解@RepositoryDefinition
其中有两个参数一定要传值,domainClass表示实体类的Class,idClass表示ID的类型的class,就如我上面进行配置的。

jpa的接口类型有很多,一般用的最多的是JpaRepository,还有CrudRepository,而Repository只是最基础的,没有实现任何的方法,是一个空的接口,所以可以进行自定义。
接下来就是使用dao的东西了,贴上我的service层
UserService.java
package cn.limbo.service;import cn.limbo.entity.User;import java.util.List;/** * Created by limbo on 2016/11/26. */public interface UserService {    public User getUserByID(int ID);    public List<User> getAllUsers();    public void addUser(String name,String password);    public void deleteUserByID(int ID);    public void updateUser(User user);    public boolean isExist(String userName);}
UserServiceImpl.java
package cn.limbo.service.impl;import cn.limbo.dao.UserDao;import cn.limbo.entity.User;import cn.limbo.service.UserService;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Service;import org.springframework.transaction.annotation.Transactional;import java.util.List;/** * Created by limbo on 2016/11/26. */@Service("userService")@Transactionalpublic class UserServiceImpl implements UserService{    @Autowired    private UserDao userDao;    @Override    public User getUserByID(int ID) {        return userDao.getUserByID(ID);    }    @Override    public List<User> getAllUsers() {        return userDao.getAllUsers();    }    @Override    public void addUser(String name,String password) {        User user = new User(name,password);        userDao.save(user);    }    @Override    public void deleteUserByID(int ID) {        userDao.delete(ID);    }    @Override    public void updateUser(User user) {        userDao.update(user.getID(),user.getName(),user.getPassword());    }    @Override    public boolean isExist(String userName) {        if(userDao.getUserByName(userName) != null)            return true;        return false;    }} 
其实最重要的是就是在需要在实现类前面加上@Transactional注解。到此,jpa配置完成咯。
附上当时我配置的时候的参考文章
http://www.cnblogs.com/dreamroute/p/5173896.html
http://www.ibm.com/developerworks/cn/opensource/os-cn-spring-jpa/

整个项目我发在了github上了,有兴趣可以看看
https://github.com/NetFilx/Google-Authenticator
 



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