hibernate.cfg.xml
<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN" "http://hibernate.org/dtd/hibernate-configuration-3.0.dtd"><hibernate-configuration> <session-factory> <!-- 指定连接数据库所用的驱动 --> <property name="connection.driver_class">com.mysql.jdbc.Driver</property> <!-- 指定连接数据库的url，其中hibernate是本应用连接的数据库名 --> <property name="connection.url">jdbc:mysql://localhost/hibernate_test</property> <!-- 指定连接数据库的用户名 --> <property name="connection.username">root</property> <!-- 指定连接数据库的密码 --> <property name="connection.password">cheng</property> <!-- 指定连接池里最大连接数 --> <property name="hibernate.c3p0.max_size">20</property> <!-- 指定连接池里最小连接数 --> <property name="hibernate.c3p0.min_size">1</property> <!-- 指定连接池里连接的超时时长 --> <property name="hibernate.c3p0.timeout">5000</property> <!-- 指定连接池里最大缓存多少个Statement对象 --> <property name="hibernate.c3p0.max_statements">100</property> <property name="hibernate.c3p0.idle_test_period">3000</property> <property name="hibernate.c3p0.acquire_increment">2</property> <property name="hibernate.c3p0.validate">true</property> <!-- 指定数据库方言 --> <property name="dialect">org.hibernate.dialect.MySQL5InnoDBDialect</property> <!-- 根据需要自动创建数据表 --> <property name="hbm2ddl.auto">update</property><!--①--> <!-- 显示Hibernate持久化操作所生成的SQL --> <property name="show_sql">true</property> <!-- 将SQL脚本进行格式化后再输出 --> <property name="hibernate.format_sql">true</property> <!-- 避免这个错误信息Disabling contextual LOB creation as createClob() method threw error :java.lang.reflect.InvocationTargetException --> <property name="hibernate.temp.use_jdbc_metadata_defaults">false</property> <!-- 罗列所有持久化类的类名 --> <mapping class="com.wechat.entity.po.User"/> <mapping class="com.wechat.entity.po.Person"/> </session-factory></hibernate-configuration>hibernate.cfg.xml文件的主要作用就是配置了一个session-factory
在session-factory中主要通过property配置一些数据库的连接信息，我们知道，Spring通常会将这种数据库连接用dataSource来表示，这样一来，hibernate.cfg.xml文件中的所有跟数据库连接的都可以干掉了，直接用spring的dataSource，而dataSource也可以用c3p0、dbcp等。
在session-factory中通过property除了配置一些数据库的连接信息之外，还有一些hibernate的配置，比如方言、自动创建表机制、格式化sql等，这些信息也需要配置起来。
还有最关键的一个持久化类所在路径的配置
当不采用spring整合的时候，我们使用hibernate时主要是用hibernate从sessionFactory中去的session，然后用session来操作持久化对象，而sessionFactory来自于配置文件。像下面这样：
StandardServiceRegistry registry = null; SessionFactory sessionFactory = null; Session session = null; Transaction transaction = null; SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); @Before public void init() { registry = new StandardServiceRegistryBuilder() .configure() // configures settings from hibernate.cfg.xml .build(); sessionFactory = new MetadataSources( registry ).buildMetadata().buildSessionFactory(); session = sessionFactory.openSession(); //开始事务 transaction = session.getTransaction(); transaction.begin(); } @Test public void testSaveUser() { User user = new User(); user.setUsername("张学友"); user.setPassword("jacky"); user.setRegistDate(sdf.format(new Date())); File file = new File("D:"+File.separator+"ubuntu.png"); String fileName = file.getName(); String prefix=fileName.substring(fileName.lastIndexOf(".")+1); System.out.println(prefix); InputStream input = null; try { input = new FileInputStream(file); } catch (FileNotFoundException e) { e.printStackTrace(); } Blob image = null; try { image = Hibernate.getLobCreator(session).createBlob(input,input.available()); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } user.setUserPic(image); session.save(user); } @After public void destroy(){ transaction.commit(); session.close(); sessionFactory.close(); StandardServiceRegistryBuilder.destroy( registry ); }Spring对hibernate的整合就是将上述三点通过spring配置起来，而hibernate最关键的sessionFactroy就是spring的一个bean
这些理解了整合就简单了，
spring的sessionFactroy像下面这样配置：
<!-- 加载配置文件 --> <context:property-placeholder location="classpath:jdbc.properties" file-encoding="utf-8" ignore-unresolvable="true" /> <bean id="sessionFactory" class="org.springframework.orm.hibernate5.LocalSessionFactoryBean"> <property name="dataSource" ref="dataSource" /> <property name="packagesToScan"> <list> <!-- 可以加多个包 --> <value>com.wechat.entity.po</value> </list> </property> <property name="hibernateProperties"> <props> <prop key="hibernate.hbm2ddl.auto">${hibernate.hbm2ddl.auto}</prop> <prop key="hibernate.dialect">${hibernate.dialect}</prop> <prop key="hibernate.show_sql">${hibernate.show_sql}</prop> <prop key="hibernate.format_sql">${hibernate.format_sql}</prop> <prop key="hibernate.temp.use_jdbc_metadata_defaults">false</prop> </props> </property> </bean>通过bean的配置可以看出该bean就是hibernate的sessionFactroy
因为它指向了org.springframework.orm.hibernate5.LocalSessionFactoryBean
在这个bean中主要配置了上面说的三点：
下面给出数据源dataSource的配置
<!-- 配置数据源 --> <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource" destroy-method="close" p:driverClass="${jdbc.driverClassName}" p:jdbcUrl="${jdbc.url}" p:user="${jdbc.username}" p:password="${jdbc.password}" p:testConnectionOnCheckout="${jdbc.c3p0.testConnectionOnCheckout}" p:testConnectionOnCheckin="${jdbc.c3p0.testConnectionOnCheckin}" p:idleConnectionTestPeriod="${jdbc.c3p0.idleConnectionTestPeriod}" p:initialPoolSize="${jdbc.c3p0.initialPoolSize}" p:minPoolSize="${jdbc.c3p0.minPoolSize}" p:maxPoolSize="${jdbc.c3p0.maxPoolSize}" p:maxIdleTime="${jdbc.c3p0.maxIdleTime}" />还有数据库的连接信息
#-----------------------------------------------------# 数据库配置#-----------------------------------------------------#服务器地址host=127.0.0.1jdbc.driverClassName=com.mysql.jdbc.Driverjdbc.url=jdbc:mysql://${host}:3306/hibernate_testjdbc.username=rootjdbc.password=cheng#-----------------------------------------------------# 适用于c3p0的配置#-----------------------------------------------------#-----------------------------------------------------# c3p0反空闲设置，防止8小时失效问题28800#-----------------------------------------------------#idleConnectionTestPeriod要小于MySQL的wait_timeoutjdbc.c3p0.testConnectionOnCheckout=falsejdbc.c3p0.testConnectionOnCheckin=truejdbc.c3p0.idleConnectionTestPeriod=3600#-----------------------------------------------------# c3p0连接池配置#-----------------------------------------------------#initialPoolSize, minPoolSize, maxPoolSize define the number of Connections that will be pooled.#Please ensure that minPoolSize <= maxPoolSize.#Unreasonable values of initialPoolSize will be ignored, and minPoolSize will be used instead.jdbc.c3p0.initialPoolSize=10jdbc.c3p0.minPoolSize=10jdbc.c3p0.maxPoolSize=100#maxIdleTime defines how many seconds a Connection should be permitted to go unused before being culled from the pool.jdbc.c3p0.maxIdleTime=3600#-----------------------------------------------------# hibernate连接池配置#-----------------------------------------------------hibernate.connection.driverClass=com.mysql.jdbc.Driverhibernate.connection.url=jdbc:mysql://${host}:3306/${dbName}hibernate.dialect=org.hibernate.dialect.MySQL5Dialecthibernate.show_sql=truehibernate.format_sql=truehibernate.hbm2ddl.auto=update配置完这些还有spring强大的事务管理
<!-- 配置Hibernate事务管理器 --> <bean id="transactionManager" class="org.springframework.orm.hibernate5.HibernateTransactionManager"> <property name="sessionFactory" ref="sessionFactory" /> </bean> <!-- 配置事务异常封装 --> <bean id="persistenceExceptionTranslationPostProcessor" class="org.springframework.dao.annotation.PersistenceExceptionTranslationPostProcessor" /> <!-- 基于数据源的事务管理器 --> <!-- <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager" p:dataSource-ref="dataSource" /> --> <!-- 配合<tx:advice>和<aop:advisor>完成了事务切面的定义 --> <!-- 使用强大的切点表达式是语言轻松定义目标方法 --> <aop:config proxy-target-class="true"> <!-- 通过aop定义事务增强切面 --> <aop:pointcut expression=" execution(* com.wechat.service..*(..))" id="serviceMethod" /> <!-- 引用事务增强 --> <aop:advisor advice-ref="txAdvice" pointcut-ref="serviceMethod" /> </aop:config> <!-- 事务增强 --> <tx:advice id="txAdvice" transaction-manager="transactionManager"> <!-- 事务属性定义 --> <tx:attributes> <tx:method name="*" /> </tx:attributes> </tx:advice>好了，这些配置好之后就可以使用在spring中配置的sessionFactroy了
UserDao
package com.wechat.dao;import java.util.List;import com.wechat.entity.po.User;public interface UserDao { // 得到所有用户 public List<User> getAllUser(); // 检测用户名是否存在 public boolean isExists(String username);}实现类
package com.wechat.dao.impl;import java.util.ArrayList;import java.util.List;import org.hibernate.Query;import org.hibernate.Session;import org.hibernate.SessionFactory;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Repository;import com.wechat.dao.UserDao;import com.wechat.entity.po.User;@Repositorypublic class UserDaoImpl implements UserDao { //注入sessionFactory @Autowired private SessionFactory sessionFactory; @SuppressWarnings("unchecked") @Override public List<User> getAllUser() { List<User> userList = new ArrayList<User>(); String hsql="from User"; Session session = sessionFactory.getCurrentSession(); Query query = session.createQuery(hsql); userList = query.list(); return userList; } @Override public boolean isExists(String username) { Query query = sessionFactory.openSession() .createQuery("from User u where u.username = :username").setParameter("username", username); System.out.println(query.list().size()); return query.list().size()>0?true:false; }}UserService
package com.wechat.service.user;import java.util.List;import com.wechat.entity.po.User;public interface UserService { public List<User> getAllUser(); public boolean isExists(String username);}实现类
package com.wechat.service.user.impl;import java.util.List;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.cache.annotation.Cacheable;import org.springframework.stereotype.Service;import com.wechat.dao.UserDao;import com.wechat.entity.po.User;import com.wechat.service.user.UserService;@Servicepublic class UserServiceImpl implements UserService { @Autowired private UserDao userDao; @Override public List<User> getAllUser() { return userDao.getAllUser(); } @Override @Cacheable(cacheNames="isExists", key="#username") public boolean isExists(String username) { return userDao.isExists(username); }}因为事务管理是配置在service层，所以用service来测试
package com.wechat.dao;import java.util.List;import org.junit.Test;import org.junit.runner.RunWith;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.test.context.ContextConfiguration;import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;import com.wechat.entity.po.User;import com.wechat.service.user.UserService;@RunWith(SpringJUnit4ClassRunner.class)@ContextConfiguration(locations = { "classpath:spring/spring-core.xml" })public class UserServiceTest { @Autowired private UserService userService; @Test public void test() { List<User> userList = userService.getAllUser(); for(User user:userList){ System.out.println(user.getUsername()); } }}联系客服
