以前一直使用spring+hibernate的方式,近来随着应用系统的增加,各系统之间又要求能够相互调用,因此决定加入session bean。
1、EJB类首先继承于org.springframework.ejb.support.AbstractStatelessSessionBean,使用此类可以简化一些操作,只需实现onEjbCreate即可:
protected void onEjbCreate() throws CreateException {
userDao = (UserDAO) getDao(ServicesConstants.CONTEXT_USERDAO, UserDAO.class);
}
另外还需要在ejbjar.xml中加入env-entry,对应的xdoclet标签如下所示:
@ejb.env-entry name="ejb/BeanFactoryPath" type="java.lang.String" value="/usermanager-ejb.xml"
2、spring中ejb对应的配置文件内容如下:
<?xml version="1.0" encoding="gb2312"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd">
<beans>
<bean id="dataSource" class="org.springframework.jndi.JndiObjectFactoryBean">
<property name="jndiName"><value>java:jdbc/****</value></property>
</bean>
<!-- Hibernate SessionFactory for Oralce -->
<bean id="sessionFactory" class="org.springframework.orm.hibernate.LocalSessionFactoryBean">
<property name="dataSource"><ref local="dataSource"/></property>
<property name="mappingResources">
<list>
<value>com/vrgrid/user/pojos/UserData.hbm.xml</value>
***
</list>
</property>
<property name="hibernateProperties">
<props>
<prop key="hibernate.dialect">net.sf.hibernate.dialect.OracleDialect</prop>
<prop key="hibernate.show_sql">false</prop>
<prop key="hibernate.use_outer_join">false</prop>
</props>
</property>
</bean>
<!-- dao -->
<bean id="userDao" class="com.vrgrid.user.bussiness.hibernate.UserDAOImpl" >
<property name="sessionFactory"><ref local="sessionFactory"/></property>
</bean>
</beans>
3、为了简化客户端的调用,在客户端的配置文件中作如下配置:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd">
<beans>
<bean id="userManager" class="org.springframework.ejb.access.LocalStatelessSessionProxyFactoryBean">
<property name="jndiName"><value>vrgrid/UserManagerLocal</value></property>
<property name="businessInterface"><value>com.vrgrid.user.module.UserManager</value></property>
</bean>
</beans>
这样,客户端在使用只需要使用如下的语句就可以了:
UserManager userMgr = (UserManager)BeanFactory.getBean("userManager");
可以看出,使用spring框架进行开发可以节省我们大量的开发时间,维护起来也非常方便。这东西还真不错。
1、EJB类首先继承于org.springframework.ejb.support.AbstractStatelessSessionBean,使用此类可以简化一些操作,只需实现onEjbCreate即可:
protected void onEjbCreate() throws CreateException {
userDao = (UserDAO) getDao(ServicesConstants.CONTEXT_USERDAO, UserDAO.class);
}
另外还需要在ejbjar.xml中加入env-entry,对应的xdoclet标签如下所示:
@ejb.env-entry name="ejb/BeanFactoryPath" type="java.lang.String" value="/usermanager-ejb.xml"
2、spring中ejb对应的配置文件内容如下:
<?xml version="1.0" encoding="gb2312"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd">
<beans>
<bean id="dataSource" class="org.springframework.jndi.JndiObjectFactoryBean">
<property name="jndiName"><value>java:jdbc/****</value></property>
</bean>
<!-- Hibernate SessionFactory for Oralce -->
<bean id="sessionFactory" class="org.springframework.orm.hibernate.LocalSessionFactoryBean">
<property name="dataSource"><ref local="dataSource"/></property>
<property name="mappingResources">
<list>
<value>com/vrgrid/user/pojos/UserData.hbm.xml</value>
***
</list>
</property>
<property name="hibernateProperties">
<props>
<prop key="hibernate.dialect">net.sf.hibernate.dialect.OracleDialect</prop>
<prop key="hibernate.show_sql">false</prop>
<prop key="hibernate.use_outer_join">false</prop>
</props>
</property>
</bean>
<!-- dao -->
<bean id="userDao" class="com.vrgrid.user.bussiness.hibernate.UserDAOImpl" >
<property name="sessionFactory"><ref local="sessionFactory"/></property>
</bean>
</beans>
3、为了简化客户端的调用,在客户端的配置文件中作如下配置:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd">
<beans>
<bean id="userManager" class="org.springframework.ejb.access.LocalStatelessSessionProxyFactoryBean">
<property name="jndiName"><value>vrgrid/UserManagerLocal</value></property>
<property name="businessInterface"><value>com.vrgrid.user.module.UserManager</value></property>
</bean>
</beans>
这样,客户端在使用只需要使用如下的语句就可以了:
UserManager userMgr = (UserManager)BeanFactory.getBean("userManager");
可以看出,使用spring框架进行开发可以节省我们大量的开发时间,维护起来也非常方便。这东西还真不错。