Topic: 如何评价是否真正掌握了Spring |
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1.如何评价是否真正掌握了Spring | Copy to clipboard |
Posted by: YuLimin Posted on: 2005-04-25 12:25 有人这样回复对Spring的掌握 MVC框架 Spring MVC-----不懂 AOP、IOC Spring------精通 如何评价是否真正掌握了Spring |
2.Re:如何评价是否真正掌握了Spring [Re: YuLimin] | Copy to clipboard |
Posted by: jigsaw Posted on: 2005-04-25 13:24 像floater那样 |
3.Re:如何评价是否真正掌握了Spring [Re: YuLimin] | Copy to clipboard |
Posted by: 烂泥 Posted on: 2005-04-25 21:54 YuLimin wrote: 问他读了基本Spring的书,然后随便考几个概念. |
4.Re:如何评价是否真正掌握了Spring [Re: YuLimin] | Copy to clipboard |
Posted by: why Posted on: 2005-04-25 22:51 是否要考考其人呢? 敝人覺得有不同層次的"精通" |
5.Re:如何评价是否真正掌握了Spring [Re: YuLimin] | Copy to clipboard |
Posted by: floater Posted on: 2005-04-25 23:38 I agree with why, it's really hard to define "精通Spring", or anything. If someone says he is good at IoC, AOP, well just ask him a few common sense questions to see what he did. That's where the exp comes. Then you just count experience. I am not "精通Spring" either, just have some experience with it. Maybe I go a little bit further, but that's all, nothing more than that. I think we should put more weight on practice/experience, less chase on fasion, . If it's useful for you, use it, otherwise find something better. |
6.Re:如何评价是否真正掌握了Spring [Re: YuLimin] | Copy to clipboard |
Posted by: alexwish Posted on: 2005-04-26 12:36 floater的治学态度非常值得学习。 |
7.Re:如何评价是否真正掌握了Spring [Re: YuLimin] | Copy to clipboard |
Posted by: tier3 Posted on: 2005-04-26 18:13 真正成功地做成了项目或产品,并在其中使用了Spring就算是精通。 无论是Struts, Spring, Hibernate,只是我们项目成功(自己满意,客户满意,小组成员满意),那我只用jsp, java bean也算成功。 只有成功地“应用”了某些技术,才是真正体现了这些技术的优势,这也是唯一说明精通的理由。 |
8.Re:如何评价是否真正掌握了Spring [Re: YuLimin] | Copy to clipboard |
Posted by: dissip Posted on: 2005-04-28 11:55 as i think spring is just a tool. so it is of not much use to say that 'i master spring'. it's the spring's concept/idea that really matters. the concept are not first invented by spring. but spring does provide an integrated implementation. for us developers, it is just like a saying in the 武侠 novel : first stage:手中有环 second stage:手中无环,心中有环 third stage:手中无环,心中也无环,人既是环,环既是人 |
9.Re:如何评价是否真正掌握了Spring [Re: YuLimin] | Copy to clipboard |
Posted by: kenny68 Posted on: 2005-04-30 10:22 我也觉得Spring不存在精通的问题,因为你先得有AOP,IOC的概念,才能做下去,Spring只是帮你更好地完成这些工作。 我从去年开始在项目中使用Spring、Hibernate,给我的感觉是一件很自然而然的事情,Spring完成我想做而没有做的工作。 当然因为能力关系,我肯定做不了那么好,但专门为我自己定制一套还是有可能的。 |
10.Re:如何评价是否真正掌握了Spring [Re: YuLimin] | Copy to clipboard |
Posted by: YuLimin Posted on: 2005-05-01 14:34 http://www.gpowersoft.com/tech/Spring/45.htm Spring Framework之最佳实践一 Spring Framework从诞生之日起,受到了越来越多的关注。最近,新的开源项目大多支持Spring Framework。国内目前也有专门的网站(http://spring.jactiongroup.net/)。那它为什么如此受欢迎呢? 我想最重要的是,EJB让每个人都痛恨。要编写一个EJB,需要写LocalHome, RemoteHome, Bean, LocalInterface, RemoteInterface,需要一个标准描述符,一个特殊厂商描述符(Weblogic、WebSphere都不一样),如果是Entity Bean,还需要Mapping文件。如此之多,实在麻烦。但EJB最重要的是解决Transaction问题,没有Spring之前,没有其他方法能够描述式的解决它。每个人、每个公司为了解决Transaction的问题,编程的写法都不一样,百花齐放。于是,在最需要它的时候,Spring出现了。 Spring的功能非常多。但对于一个产品,最重要的是如何用好它的精华。Spring包含AOP、ORM、DAO、Context、Web、MVC几个部分组成。Web、MVC暂不用考虑,用成熟的Struts、JSP或Webwork更好。DAO由于目前Hibernate、JDO的流行,也可不考虑。因此最需要用的是AOP、ORM、Context。 Context中,最重要的是Beanfactory,它是将接口与实现分开,非常重要。以前我们写程序,如一个接口IDocument,一个实现类Document1。在写程序时,需写成IDocument doc = new Document1(),一旦我们的实现类需改变时,变为Document2,则程序需写成IDocument doc = new Document2(),所有用到的地方全需改。Beanfactory帮我们解决了这个问题,用context后,写法变为IDocument doc=(IDocument)beanFactory.getBean("doc")。如果实现类从Document1改为Document2,直接在配置文件改就可以了。Context是Bean factory的进一步抽象。很多人都喜欢用ApplicationConext,用Servlet把它Load。这样就把Bean Factory与Web绑定在一起。如果是Fat Client或Remote调用,则这些Bean factory就很难调用,实际是将表现层与业务层绑定的太紧。推荐的方法是SingletonBeanFactoryLocator。具体为: BeanFactoryLocator bfLocator = SingletonBeanFactoryLocator.getInstance(); BeanFactoryReference bf = bfLocator.useBeanFactory("beanFactory"); // now use some bean from factory return bf.getFactory().getBean(name); <beans> <bean id="beanFactory" class="org.springframework.context.support.ClassPathXmlApplicationContext"> <constructor-arg> <list> <value>dataAccessContext.xml</value> <value>securityContext.xml</value> <value>...</value> </list> </constructor-arg> </bean> </beans> 这样,就可随时动态扩展,实现组件式的开发。 |
11.Re:如何评价是否真正掌握了Spring [Re: YuLimin] | Copy to clipboard |
Posted by: YuLimin Posted on: 2005-05-01 14:36 http://www.gpowersoft.com/tech/Spring/46.htm Spring Framework之最佳实践二 Spring Framework最得以出名的是与Hibernate的无缝链接,基本上用Spring,就会用Hibernate。可惜的是Spring提供的HibernateTemplate功能显得不够,使用起来也不是很方便。我们编程序时,一般先写BusinessService,由BusinessService调DAO来执行存储,在这方面Spring没有很好的例子,造成真正想用好它,并不容易。 我们的思路是先写一个BaseDao,仿照HibernateTemplate,将基本功能全部实现: public class BaseDao extends HibernateDaoSupport{ private Log log = LogFactory.getLog(getClass()); public Session openSession() { return SessionFactoryUtils.getSession(getSessionFactory(), false); } public Object get(Class entityClass, Serializable id) throws DataAccessException { Session session = openSession(); try { return session.get(entityClass, id); } catch (HibernateException ex) { throw SessionFactoryUtils.convertHibernateAccessException(ex); } } public Serializable create(Object entity) throws DataAccessException { Session session = openSession(); try { return session.save(entity); } catch (HibernateException ex) { throw SessionFactoryUtils.convertHibernateAccessException(ex); } } ... 其它的DAO,从BaseDao继承出来,这样写其他的DAO,代码就会很少。 从BaseDao继承出来EntityDao,专门负责一般实体的基本操作,会更方便。 public interface EntityDao { public Object get(Class entityClass, Serializable id) throws DataAccessException; public Object load(Class entityClass, Serializable id) throws DataAccessException; public Serializable create(Object entity) throws DataAccessException; ...} /** * Base class for Hibernate DAOs. This class defines common CRUD methods for * child classes to inherit. User Sping AOP Inteceptor */ public class EntityDaoImpl extends BaseDao implements EntityDao{ } 为了Transaction的控制,采用AOP的方式: public interface EntityManager { public Object get(Class entityClass, Serializable id); public Object load(Class entityClass, Serializable id); public Serializable create(Object entity); ... } /** * Base class for Entity Service. User Sping AOP Inteceptor */ public class EntityManagerImpl implements EntityManager { private EntityDao entityDao; public void setEntityDao(EntityDao entityDao) { this.entityDao = entityDao; } public Object get(Class entityClass, Serializable id) { return entityDao.get(entityClass, id); } public Object load(Class entityClass, Serializable id) { return entityDao.load(entityClass, id); } ... } 这样我们就有了一个通用的Hibernate实体引擎,可以对任何Hibernate实体实现基本的增加、修改、删除、查询等。 其它的BusinessService就可以继承EntityManager,快速实现业务逻辑。 具体XML配置如下: <!-- Oracle JNDI DataSource for J2EE environments --> <bean id="dataSource" class="org.springframework.jndi.JndiObjectFactoryBean"> <property name="jndiName"><value>java:comp/env/jdbc/testPool</value></property> </bean> <!-- Hibernate SessionFactory for Oracle --> <!-- Choose the dialect that matches your "dataSource" definition --> <bean id="sessionFactory" class="org.springframework.orm.hibernate.LocalSessionFactoryBean"> <property name="dataSource"><ref local="dataSource"/></property> <property name="mappingResources"> <value>user-hbm.xml</value> </property> <property name="hibernateProperties"> <props> <prop key="hibernate.dialect">net.sf.hibernate.dialect.OracleDialect</prop> <prop key="hibernate.cache.provider_class">net.sf.ehcache.hibernate.Provider</prop> <prop key="hibernate.cache.use_query_cache">true</prop> <prop key="hibernate.show_sql">false</prop> </props> </property> </bean> <!-- AOP DAO Intecepter --> <bean id="hibernateInterceptor" class="org.springframework.orm.hibernate.HibernateInterceptor"> <property name="sessionFactory"> <ref bean="sessionFactory"/> </property> </bean> <bean id="entityDaoTarget" class="com.gpower.services.entity.dao.EntityDaoImpl"> <property name="sessionFactory"> <ref bean="sessionFactory"/> </property> </bean> <bean id="entityDao" class="org.springframework.aop.framework.ProxyFactoryBean"> <property name="proxyInterfaces"> <value>com.gpower.services.entity.dao.EntityDao</value> </property> <property name="interceptorNames"> <list> <value>hibernateInterceptor</value> <value>entityDaoTarget</value> </list> </property> </bean> <!-- Transaction manager for a single Hibernate SessionFactory (alternative to JTA) --> <bean id="transactionManager" class="org.springframework.orm.hibernate.HibernateTransactionManager"> <property name="sessionFactory"><ref local="sessionFactory"/></property> </bean> <!-- Transaction manager that delegates to JTA (for a transactional JNDI DataSource) --> <!-- <bean id="transactionManager" class="org.springframework.transaction.jta.JtaTransactionManager"/> --> <!-- Transactional proxy for the Application primary business object --> <bean id="entityManagerTarget" class="com.gpower.services.entity.EntityManagerImpl"> <property name="entityDao"> <ref bean="entityDao"/> </property> </bean> <bean id="entityManager" class="org.springframework.transaction.interceptor.TransactionProxyFactoryBean"> <property name="transactionManager"> <ref bean="transactionManager"/> </property> <property name="target"> <ref bean="entityManagerTarget"/> </property> <property name="transactionAttributes"> <props> <prop key="get*">PROPAGATION_SUPPORTS</prop> <prop key="*">PROPAGATION_REQUIRED</prop> </props> </property> </bean> |
12.Re:如何评价是否真正掌握了Spring [Re: YuLimin] | Copy to clipboard |
Posted by: jigsaw Posted on: 2005-05-01 18:22 说实话EJB不是因为“写起来麻烦”而挨骂的 写起来其实一点也不麻烦 主流ide都有wizard帮你写那些interface/xml 发布起来也不麻烦 要么写好ant 要么给wsad之类的大块头帮你发布 我们公司的几个千万级的大项目 虽说我认为不成功 但是在发布这方面,我觉得做到了对初级开发者透明的地步,刚进公司的新人没几天工夫也能编译发布整个app勒 EJB挨骂无非是倚重remote太厉害了 还有开始吹牛太多了 其实context, transaction, interceptor这些概念在EJB里面体现得很漂亮 EJB唯一做错的就是一开始把自己绑在重量级+remote这个东西上面了 唉。。。但愿EJB3能雄起 |
13.Re:如何评价是否真正掌握了Spring [Re: YuLimin] | Copy to clipboard |
Posted by: floater Posted on: 2005-05-02 02:02
1. As jigsaw said, the development of EJB is much better now. 2. EJB最重要的是解决Transaction问题 - no, it's *distributed* transaction problem. If it's not distributed, just over one connection, local transaction is not a problem. 3. EJB's problem is the assumption of *distributing* computing everywhere, this is typically the ignorance of architects.
There is no such thing as 最佳实践, 精华, it's just a damn tool, use it or not. In fact, Spring's MVC is more flexible. 成熟的Struts is really not well designed at all. |
14.Re:如何评价是否真正掌握了Spring [Re: YuLimin] | Copy to clipboard |
Posted by: YuLimin Posted on: 2005-05-03 11:20 EJB的思想还是要学习的。 |
15.Re:如何评价是否真正掌握了Spring [Re: YuLimin] | Copy to clipboard |
Posted by: ftang Posted on: 2005-05-05 00:55 The major problem of EJB is too heavy... the reason of too heavy is because of the over-design... in the real life...there ar not so many case we have to use EJB.... so at the beginning of J2EE....sun over-design the EJB, and us as app-developer over-design our project... and one day... someone waked up...say "wait a minute, do we really need EJBs?" ... then there is russian-american come up with spring.... |
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