我是如何整合SSH的(一)

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概述

在之前一段时间内，我断断续续在课余时间学习了struts2、hibernate3、spring和其他javaEE的关键技术。由于之间一直呆在实验室帮老师做一个其他的项目，并没有很认真地学习javaEE，掌握的知识可能并不是很牢靠，所以通过整合SSH这个过程来提高我对JavaEE的认知。

Spring整合Hibernate3之注册案例

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//定义User
	private Integer id;
	private String username;
	private String pwd;
	private Integer age;
	private Date birthday;
	
//User.hbx.xml配置文件
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC 
    "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
    "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
	<class name="com.ssh.bean.User" table="user">
	  <id name="id">
	  	<generator class="native"></generator>
	  </id>
	  <property name="username"></property>
	  <property name="pwd"></property>
	  <property name="age"></property>
	  <property name="birthday" type="date"></property>
	</class>
</hibernate-mapping>

//UserDaoImpl ,继承自HibernateDaoSupport，可以使用hibernate的模版
public class UserDaoImpl extends HibernateDaoSupport implements UserDao {
	public void addUser(User u) {
        this.getHibernateTemplate().save(u);
	}
}

//UserService层,这一层和以前没有任何改变
public class UserServiceImpl implements UserService {

	private UserDao userDao;
	public void setUserDao(UserDao userDao) {
		this.userDao = userDao;
	}
	public void register(User u) {
        this.userDao.addUser(u);
	}
}

//用注册一个用户来测试Spring是否已经整合了hibernate
public class SSHTest {
	@Test
	public void testAdd(){
		User u = new User();
		u.setUsername("jessyon");
		u.setPwd("1234");
		u.setAge(18);
		u.setBirthday(new Date());
		
		String xmlPath="applicationContext.xml";
		ApplicationContext applicationContext = new ClassPathXmlApplicationContext(xmlPath);
		UserService userService = (UserService) applicationContext.getBean("userService");	
		userService.register(u);  
	}
	
//和单独使用hibernate一样，需要在src下创建一个hibernate.cfg.xml配置文件
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC
	"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
	"http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">

<hibernate-configuration>
	<session-factory>
		<!-- 1.基本4项 -->
		<property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
		<property name="hibernate.connection.url">jdbc:mysql:///ssh</property>
		<property name="hibernate.connection.username">root</property>
		<property name="hibernate.connection.password">jessyon6233834</property>
		
		<!-- 方言 -->
		<property name="hibernate.dialect">org.hibernate.dialect.MySQL5Dialect</property>
		
		<!-- sql语句 -->
		<property name="hibernate.show_sql">true</property>
		<property name="hibernate.format_sql">true</property>
		
			<!-- 6 取消bean校验 -->
		<property name="javax.persistence.validation.mode">none</property>
	
		<!-- 添加映射文件 -->
		<mapping resource="com/ssh/bean/User.hbm.xml"/>
	</session-factory>
</hibernate-configuration>	

//Spring的配置都保存在applicationContext.xml里面
<?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"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans 
       					   http://www.springframework.org/schema/beans/spring-beans.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/context 
       					   http://www.springframework.org/schema/context/spring-context.xsd">
	<!-- 1 获得session工厂
			* 加载hibernate.cfg.xml 获得工厂
				configLocation : 确定配置文件位置
	-->

	<bean id="sessionFactory" class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
		<property name="configLocation" value="classpath:hibernate.cfg.xml"></property>
	</bean>
	
	<!-- 2  模板 -->
	<bean id="hibernateTemplate" class="org.springframework.orm.hibernate3.HibernateTemplate">
		<property name="sessionFactory" ref="sessionFactory"></property>
	</bean>
	
	<!-- dao UserDao类里用到了hibernateTemplate，所以需要将之注入到dao里面-->
	<bean id="userDao" class="com.ssh.daoimpl.UserDaoImpl">
		<property name="hibernateTemplate" ref="hibernateTemplate"></property>
	</bean>
	
	<bean id="userService" class="com.ssh.serviceimpl.UserServiceImpl">
		<property name="userDao" ref="userDao"></property>
	</bean>
	
	<!-- 事务管理 ,需要将管理事务的session注入-->
	<bean id="txManager" class="org.springframework.orm.hibernate3.HibernateTransactionManager">
		<property name="sessionFactory" ref="sessionFactory"></property>
	</bean>
	
	<tx:advice id="txAdvice" transaction-manager="txManager">
		<tx:attributes>
			<tx:method name="register"/>
		</tx:attributes>
	</tx:advice>
	
	<!-- aop 执行service中的方法前，添加事务管理。如果不加这句话，就相当于执行了rollback,没有commit-->
	<aop:config>
		<aop:advisor advice-ref="txAdvice" pointcut="execution(* com.ssh.service..*.*(..))"/>
	</aop:config>
</beans>

//也可以不使用hibernate.cfg.xml，那么applicationContext需要微调

//使用c3p0作为数据源(连接池)
<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
		<property name="driverClass" value="com.mysql.jdbc.Driver"></property>
		<property name="jdbcUrl" value="jdbc:mysql:///ssh"></property>
		<property name="user" value="root"></property>
		<property name="password" value="jessyon6233834"></property>
	</bean>
	
	//session工厂的内容变多，不仅需要注入数据源，还要将hibernate.cfg.xml里的内容注入
	<bean id="sessionFactory" class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
		<property name="dataSource" ref="dataSource"></property>
		<property name="hibernateProperties">
			<props>
				<prop key="hibernate.dialect">org.hibernate.dialect.MySQL5Dialect</prop>
				<prop key="hibernate.show_sql">true</prop>
				<prop key="hibernate.format_sql">true</prop>
				<prop key="hibernate.current_session_context_class">thread</prop>
				<prop key="javax.persistence.validation.mode">none</prop>
			</props>
		</property>
		<property name="mappingLocations" value="classpath:com/ssh/bean/*.hbm.xml"></property>
	</bean>