[Spring]

Spring整合Hibernate，花了很长时间研究，其中碰到的比较多问题。

使用的是Spring3.0+Hibernate4.1.6，Spring整合最新版本的Hibernate4.5，会抛些奇奇怪怪的异常。这个官网有说明。

先上代码。

spring的xml配置：springContext.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-2.5.xsd
                     http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-2.5.xsd
                     http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.5.xsd
                     http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.5.xsd">

    <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="driverClassName" value="com.mysql.jdbc.Driver" />
        <property name="url" value="jdbc:mysql://127.0.0.1/test" />
        <property name="username" value="root" />
        <property name="password" value="root" />
    </bean>

    <bean id="sessionFactory" class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
        <property name="dataSource" ref="dataSource" />
        <property name="packagesToScan">
            <list>
                <value>com.my.entity</value>
            </list>
        </property>
        <property name="hibernateProperties">
            <value>
                hibernate.dialect=org.hibernate.dialect.MySQL5Dialect
                hibernate.hbm2ddl.auto=update
                hibernate.show_sql=true
                hibernate.format_sql=false
                hibernate.cache.use_second_level_cache=true
                hibernate.cache.use_query_cache=false
                hibernate.cache.provider_class=org.hibernate.cache.internal.NoCacheProvider
                hibernate.current_session_context_class= org.springframework.orm.hibernate4.SpringSessionContext
            </value>
        </property>
    </bean>
    <bean id="txManager" class="org.springframework.orm.hibernate4.HibernateTransactionManager">
        <property name="sessionFactory" ref="sessionFactory" />
    </bean>
    
    <context:component-scan base-package="com.my" />
    
    <tx:annotation-driven transaction-manager="txManager" />
    <tx:advice id="txAdvice" transaction-manager="txManager">
        <tx:attributes>
            <tx:method name="*" read-only="true"/>
            <tx:method name="add*" propagation="REQUIRED" rollback-for="Exception"/>
            <tx:method name="create*" propagation="REQUIRED" rollback-for="Exception"/>
            <tx:method name="insert*" propagation="REQUIRED" rollback-for="Exception"/>
            <tx:method name="update*" propagation="REQUIRED" rollback-for="Exception"/>
            <tx:method name="delete*" propagation="REQUIRED" rollback-for="Exception"/>
            <tx:method name="remove*" propagation="REQUIRED" rollback-for="Exception"/>
        </tx:attributes>
    </tx:advice>
    
    <aop:config>
      <aop:pointcut id="allServiceMethods" expression="execution(* com.my.service.*.*(..))"/>
      <aop:advisor advice-ref="txAdvice" pointcut-ref="allServiceMethods"/>
    </aop:config>

</beans>

逐一解释下这个XML，这是最关键的地方：

1、dataSource，这里所使用的是spring自带的org.springframework.jdbc.datasource.DriverManagerDataSource，但这个一般用于个人开发或非并发小项目是可以的，如果用于大型的项目，需要把它替换使用proxool。proxool与spring配置，可以网上搜索下。

2、sessionFactory，里头有个property值为packagesToScan，应该是hibernate所使用的annotation object（即POJO）。使用这个packagesToScan，会自动扫描代码，无需一个个写了。

3、txManager，这是transation管理bean，意思是把声明一个transation bean，以待注入。

4、<context:component-scan base-package="com.my" />，这句是spring使用annotation做注入，基于com.my的命名空间下的所有包和类扫描

5、<tx:annotation-driven transaction-manager="txManager" />，声明一个annotation的transation，让AOP使用。

6、txAdvice，声明一个spring AOP的advice，其意思是内容中定义的attributes对应的方法是否需要开启或禁用transation，以及rollback条件。

7、<aop:config/>是spring的AOP，将txAdvice切入到对应的pointcut中。

补充：

因为测试时使用的是MySql，在测试transation时，发现怎么也不能回滚。原来是MySql数据库要把表引擎修改为InnoDB类型才支持事务。之前使用的是绿色版的MySql，设置了很久也没设置成功，最后去官网下了个安装版的5.7版本，装上默就是InnoDB。-_-#

贴代码：

DAO:

package com.my.dao;

import javax.annotation.Resource;

import org.hibernate.SessionFactory;
import org.springframework.stereotype.Repository;

import com.my.entity.Account;

@Repository
public abstract class AccountDaoFactory {
    @Resource
    private SessionFactory sessionFactory;
    
    public SessionFactory getSessionFactory() {
        return sessionFactory;
    }

    public void setSessionFactory(SessionFactory sessionFactory) {
        this.sessionFactory = sessionFactory;
    }
    
    /*
     * Fin account by id
     */
    public abstract Integer findAccount(Integer accountID);
    
    /*
     * Add account
     */
    public abstract Account add(String name);
    
    /*
     * Delete account
     */
    public abstract boolean delete(long id);
}

package com.my.dao.mysql;

import org.hibernate.Session;
import org.springframework.stereotype.Repository;

import com.my.entity.Account;

@Repository(value = "accountDao")
public class AccountDao extends com.my.dao.AccountDaoFactory {
    /*
     * Find account by account id
     */
    @Override
    public Integer findAccount(Integer accountID) {
        return accountID;
    }

    @Override
    public Account add(String name) {
        Session session = super.getSessionFactory().getCurrentSession();

        Account account = new Account();
        account.setName(name);
        session.save(account);
        return account;
    }

    @Override
    public boolean delete(long id) {
        Session session = super.getSessionFactory().getCurrentSession();
        Account account = (Account) session.get(Account.class, id);
        session.delete(account);
        return true;
    }
}

Service:

package com.my.service;

import javax.annotation.Resource;

import com.my.dao.AccountDaoFactory;
import com.my.entity.Account;

public abstract class AccountServiceFactory {
    @Resource(name="accountDao")
    protected AccountDaoFactory accountDao;
    
    public AccountDaoFactory getAccountDAO() {
        return accountDao;
    }

    public void setAccountDAO(AccountDaoFactory accountDAO) {
        this.accountDao = accountDAO;
    }
    
    /*
     * Find account by id
     */
    public abstract Integer findAccount(Integer accountID);
    
    /*
     * Add account
     */
    public abstract Account add(String name);
    
    /*
     * Delete account
     */
    public abstract boolean delete(long id);
    
    /*
     * Add and Delete account, transaction test.
     */
    public abstract boolean addAndDelete(String name);
}

package com.my.service.mysql;

import org.springframework.stereotype.Service;

import com.my.entity.Account;
import com.my.service.AccountServiceFactory;

@Service(value="accountService")
public class AccountService extends AccountServiceFactory {

    @Override
    public Integer findAccount(Integer accountID) {
        return accountDao.findAccount(accountID);
    }

    @Override
    public Account add(String name) {
        return accountDao.add(name);
    }

    @Override
    public boolean delete(long id) {
        return accountDao.delete(id);
    }

    @Override
    public boolean addAndDelete(String name) {
        Account account = accountDao.add(name);
        boolean result = accountDao.delete(account.getId());
        return result;
    }
    
}

Controller:

package com.my.controller;

import javax.annotation.Resource;

import org.springframework.stereotype.Controller;

import com.my.entity.Account;
import com.my.service.AccountServiceFactory;

@Controller
public class SpringController {
    @Resource(name="accountService")
    private AccountServiceFactory accountService;
    
    public AccountServiceFactory getAccount() {
        return accountService;
    }

    public void setAccount(AccountServiceFactory account) {
        this.accountService = account;
    }
    
    public Integer findAccount(Integer accountID){
        return accountService.findAccount(accountID);
    }
    
    public Account add(String name){
        return accountService.add(name);
    }
    
    public boolean delete(long id){
        return accountService.delete(id);
    }
    
    public boolean addAndDelete(String name){
        return accountService.addAndDelete(name);
    }
}

POJO entity:

package com.my.entity;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Table;

@Entity
@Table(name = "account")
public class Account {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "id")
    private long id;

    @Column(name = "name", length = 200)
    private String name;

    public long getId() {
        return id;
    }

    public void setId(long id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }
}

JUnit测试：

package com.my.controller;

import static org.junit.Assert.*;

import org.junit.Before;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class SpringControllerTest {
    private SpringController springController;
    private ApplicationContext context;

    @Before
    public void setUp() throws Exception {
        context = new ClassPathXmlApplicationContext("springContext.xml");
        // Use class load
        springController = (SpringController)context.getBean(SpringController.class);
    }

    @Test
    public void testFindAccount() {
        String name = "Robin";
        boolean result = springController.addAndDelete(name);
        assertTrue(result);
    }

}

输出结果：

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项目结构：

Spring所需要用到的Jar包：

Hibernate4.1.6所需要用到的Jar包：