整合之道--Spring4整合Hibernate5
阿新 • • 發佈：2019-02-12
Spring與Hiberante整合
通過Hibernate的學習，我們知道，hibernate主要在hibernate.cfg.xml配置檔案中
接下來我們看一下hibernate的一個配置檔案
hibernate配置檔案
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"> 配置檔案的作用
hibernate.cfg.xml檔案的主要作用就是配置了一個session-factory
在session-factory中主要通過property配置一些資料庫的連線資訊，我們知道，Spring通常會將這種資料庫連線用dataSource來表示，這樣一來，hibernate.cfg.xml檔案中的所有跟資料庫連線的都可以幹掉了，直接用spring的dataSource，而dataSource也可以用c3p0、dbcp等。
在session-factory中通過property除了配置一些資料庫的連線資訊之外，還有一些hibernate的配置，比如方言、自動建立表機制、格式化sql等，這些資訊也需要配置起來。
還有最關鍵的一個持久化類所在路徑的配置
當不採用spring整合的時候，我們使用hibernate時主要是用hibernate從sessionFactory中去的session，然後用session來操作持久化物件，而sessionFactory來自於配置檔案。像下面這樣：
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();
//開始事務
transaction = session.getTransaction();
transaction.begin();
}
@Test
public void testSaveUser() {
User user = new User();
user.setUsername("張學友");
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對hibernate的整合就是將上述三點通過spring配置起來，而hibernate最關鍵的sessionFactroy就是spring的一個bean
這些理解了整合就簡單了，
SessionFactoryBean
spring的sessionFactroy像下面這樣配置：
<!-- 載入配置檔案 -->
<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>
<!-- 可以加多個包 -->
<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>通過bean的配置可以看出該bean就是hibernate的sessionFactroy
因為它指向了org.springframework.orm.hibernate5.LocalSessionFactoryBean
在這個bean中主要配置了上面說的三點：
- 資料來源dataSource
- hibernate的配置，包括方言，輸出sql等
- 持久化類的位置，通過包進行掃描
下面給出資料來源dataSource的配置
dataSource
<!-- 配置資料來源 -->
<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="${jdbc.c3p0.maxIdleTime}" />還有資料庫的連線資訊
jdbc.properties
#-----------------------------------------------------
# 資料庫配置
#-----------------------------------------------------
#伺服器地址
host=127.0.0.1
jdbc.driverClassName=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://${host}:3306/hibernate_test
jdbc.username=root
jdbc.password=cheng
#-----------------------------------------------------
# 適用於c3p0的配置
#-----------------------------------------------------
#-----------------------------------------------------
# c3p0反空閒設定，防止8小時失效問題28800
#-----------------------------------------------------
#idleConnectionTestPeriod要小於MySQL的wait_timeout
jdbc.c3p0.testConnectionOnCheckout=false
jdbc.c3p0.testConnectionOnCheckin=true
jdbc.c3p0.idleConnectionTestPeriod=3600
#-----------------------------------------------------
# c3p0連線池配置
#-----------------------------------------------------
#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=10
jdbc.c3p0.minPoolSize=10
jdbc.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連線池配置
#-----------------------------------------------------
hibernate.connection.driverClass=com.mysql.jdbc.Driver
hibernate.connection.url=jdbc:mysql://${host}:3306/${dbName}
hibernate.dialect=org.hibernate.dialect.MySQL5Dialect
hibernate.show_sql=true
hibernate.format_sql=true
hibernate.hbm2ddl.auto=update配置完這些還有spring強大的事務管理
<!-- 配置Hibernate事務管理器 -->
<bean id="transactionManager"
class="org.springframework.orm.hibernate5.HibernateTransactionManager">
<property name="sessionFactory" ref="sessionFactory" />
</bean>
<!-- 配置事務異常封裝 -->
<bean id="persistenceExceptionTranslationPostProcessor"
class="org.springframework.dao.annotation.PersistenceExceptionTranslationPostProcessor" />
<!-- 基於資料來源的事務管理器 -->
<!-- <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager"
p:dataSource-ref="dataSource" /> -->
<!-- 配合<tx:advice>和<aop:advisor>完成了事務切面的定義 -->
<!-- 使用強大的切點表示式是語言輕鬆定義目標方法 -->
<aop:config proxy-target-class="true">
<!-- 通過aop定義事務增強切面 -->
<aop:pointcut expression=" execution(* com.wechat.service..*(..))"
id="serviceMethod" />
<!-- 引用事務增強 -->
<aop:advisor advice-ref="txAdvice" pointcut-ref="serviceMethod" />
</aop:config>
<!-- 事務增強 -->
<tx:advice id="txAdvice" transaction-manager="transactionManager">
<!-- 事務屬性定義 -->
<tx:attributes>
<tx:method name="*" />
</tx:attributes>
</tx:advice>好了，這些配置好之後就可以使用在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 {
// 得到所有使用者
public List<User> getAllUser();
// 檢測使用者名稱是否存在
public boolean isExists(String username);
}
實現類
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;
@Repository
public 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);
}
實現類
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;
@Service
public 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);
}
}
因為事務管理是配置在service層，所以用service來測試
測試
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());
}
}
}
輸入結果
Hibernate:
select
user0_.userid as userid1_2_,
user0_.password as password2_2_,
user0_.registDate as registDa3_2_,
user0_.userPic as userPic4_2_,
user0_.username as username5_2_
from
user_info user0_
程高偉
張學友
資料庫表
好了Spring整合hibernate就寫到這裡。
專案地址