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李岚 — Wed, 28 Dec 2005 11:02:00 GMT

摘要: 背景�Q?拦截器是现在很多�E�序必须的一个东�ѝ��比如要在某个方法的前后做些处理�Q�在一些特定的情况下可能会(x��)��D��大量的重复代码。而假如我们拥有了(ji��n)�c�M��拦截器一��L(f��ng)��东西�Q�那我们��可以�Q意在自己希望的方法的执行前后做我们自��q��处理�Q�比如日志，取得参数或者是事务�{��? 实现�Q?1�Q�首先定义一个业务接�? 1/** *//** 3 *&nbs... 阅读全文

李岚 2005-12-28 19:02 发表评论

李岚 — Wed, 23 Nov 2005 05:52:00 GMT

前两�U�方式webwork的wiki里有�Q�就不多说了(ji��n),点这里可以查�?/A>�?BR>而以下的�l�出的思�\是webwork mail list的讨论的一�U�方案，应该是最好的一�U�方案�?BR>
代码1�Q?/FONT>

public class SpringContainer implements Container {
    private ApplicationContext applicationContext;

    public SpringContainer(ServletContext servletContext) {
        this.applicationContext = WebApplicationContextUtils.getWebApplicationContext(servletContext);
    }

    public SpringContainer(ApplicationContext applicationContext) {
        this.applicationContext = applicationContext;
    }

    /**
     * @param key
     *            component class type or component name
     * @return @throws
     *         ComponentNotFoundException
     */
    public Object getComponent(Object key) throws ComponentNotFoundException {
        if (applicationContext == null)
            throw new IllegalStateException("Spring Application context has not been set");
        if (key == null)
            throw new ComponentNotFoundException("The component key can not be null");
        if (key instanceof Class) {
            Map beans = applicationContext.getBeansOfType((Class) key);
            if (beans == null)
                throw new ComponentNotFoundException("The container is unable to resolve single instance of " + ((Class) key).getName()
                        + ", none instances found");
            if (beans.size() == 0 || beans.size() > 1)
                throw new ComponentNotFoundException("The container is unable to resolve single instance of " + ((Class) key).getName()
                        + ", number of instances found was: " + beans.size());
            key = beans.keySet().iterator().next();
        }
        return applicationContext.getBean(key.toString());
    }

    public void reload() {
        close();
        ((AbstractApplicationContext) applicationContext).refresh();
    }

    public void autowireComponent(Object bean) {
        ((AbstractApplicationContext) applicationContext).getBeanFactory().autowireBeanProperties(bean, AutowireCapableBeanFactory.AUTOWIRE_BY_NAME, false);
    }

    public void close() {
        ((AbstractApplicationContext) applicationContext).close();
    }

}

代码2�Q?BR>

public class ComponentAutowireInterceptor implements Interceptor {

    public void destroy() {
        // TODO Auto-generated method stub
    }

    public void init() {
        // TODO Auto-generated method stub
    }

    public String intercept(ActionInvocation invocation) throws Exception {
        Application.getInstance().getContainer().autowireComponent(invocation.getAction());
        return invocation.invoke();
    }

}

�q�几�D�代码，你不需要在spring里配�|�a(ch��n)ction�Q�也不需要在xwork.xml里面配置external-ref。只要保证action引用的东东和spring里面同名��p��够auto wire by name�?ji��n)�?BR>
原理�Q�拦截器�?x��)在每个action之前调用autowireComponent(invocation.getAction())。这样spring��׃��(x��)去自动组装这个传�q�来的action对象�Q�而action对象里的属性和spring里的bean id同名。所以spring��׃��(x��)自动��application.xml里对应的bean注射到action的属性里去，从而达到把action按用户希望的方式�l�装��h��的目的�?BR>
如：(x��)
appliaction.xml

    <bean id="myService">
        <property name="target">
            <bean class="myServiceDefaultImpl" autowire="byName">
          property>
    bean>

xwork.xml

        <action name="myAction" class="myAction">
            <result name="success">/success.ftlresult>
        action>

Action:

public class myAction extends ActionSupport {
    protected myService;
         .......

    }

最后记得要在web.xml配上listener-class

李岚 2005-11-23 13:52 发表评论

AOP,IOC,Spring

李岚 — Wed, 01 Jun 2005 06:11:00 GMT

理解AOP

AspectOrientedProgrammingAOPAOPAspectAspectAspectOOPgeneralizationspecializationAOPDecoratorSpringIocSingleton,XMLSpring通过�?/SPAN>�l��g工厂�?/SPAN>BeanFactoryApplicationContextIocIocIocXMLJavaXMLIocXMLTemplate MethodTemplateTemplate李岚 2005-06-01 14:11 发表评论

李岚 — Fri, 27 May 2005 03:29:00 GMT

摘要: 前言最�q�在看Spring MVC的源�?��把自己对MVC模式和对各种框架的实现的认识写出来给大家看看,��是一个�ȝ��.所�?恌��大家用怀疑的眼光来看待这��文�?假如有认识不对的地方,�ȝ��(ch��)指出. MVC与WEB应用 MVC是什么就不用我多说了(ji��n).对于现有较成熟的Model-View-Control(MVC)框架而言,其注意的主要问题无外乎下面这�? Model: 模型应该包含��p��图显�C�的数据... 阅读全文

李岚 2005-05-27 11:29 发表评论