blazeds+spring

blazeds加入spring需要注意如下几个地方：
1.引入spring.jar
2.remoting-config.xml中加入如下配置：
<destination  id ="helloworld">     
      <properties >     
      <factory>spring</factory><!--通过spring得到类的实例-->
         <source>helloworld</source>         
</properties >
3.写一个类名为SpringFactory implements FlexFacotry
代码如下：
package spring.factories;

import org.springframework.context.ApplicationContext;
import org.springframework.web.context.support.WebApplicationContextUtils;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.NoSuchBeanDefinitionException;

import flex.messaging.FactoryInstance;
import flex.messaging.FlexFactory;
import flex.messaging.config.ConfigMap;
import flex.messaging.services.ServiceException;

/**
* This interface is implemented by factory components which provide
* instances to the flex messaging framework.  To configure flex data services
* to use this factory, add the following lines to your services-config.xml
* file (located in the WEB-INF/flex directory of your web application).
*
* &lt;factories&gt;
*     &lt;factory id="spring" class="flex.samples.factories.SpringFactory" /&gt;
*  &lt;/factories&gt;
*
* You also must configure the web application to use spring and must copy the spring.jar
* file into your WEB-INF/lib directory.  To configure your app server to use spring,
* you add the following lines to your WEB-INF/web.xml file:
*
*   &lt;context-param&gt;
*        &lt;param-name&gt;contextConfigLocation&lt;/param-name&gt;
*        &lt;param-value&gt;/WEB-INF/applicationContext.xml&lt;/param-value&gt;
*   &lt;/context-param&gt;
*
*   &lt;listener&gt;
*       &lt;listener-class&gt;org.springframework.web.context.ContextLoaderListener&lt;/listener-class&gt;
*   &lt;/listener&gt;
*
* Then you put your spring bean configuration in WEB-INF/applicationContext.xml (as per the
* line above).  For example:
*
*  &lt;?xml version="1.0" encoding="UTF-8"?&gt;
*  &lt;!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd"&gt;
*  
*  &lt;beans&gt;
*    &lt;bean name="weatherBean" class="dev.weather.WeatherService" singleton="true"/&gt;
*  &lt;/beans&gt;
* 
* Now you are ready to define a destination in flex that maps to this existing service.
* To do this you'd add this to your WEB-INF/flex/remoting-config.xml:
*
*  &lt;destination id="WeatherService"&gt;
*      &lt;properties&gt;
*          &lt;factory&gt;spring&lt;/factory&gt;
*          &lt;source&gt;weatherBean&lt;/source&gt;
*      &lt;/properties&gt;
*  &lt;/destination&gt;
*
* @author Jeff Vroom
*/
public class SpringFactory implements FlexFactory
{
    private static final String SOURCE = "source";

    /**
     * This method can be used to initialize the factory itself.  It is called with configuration
     * parameters from the factory tag which defines the id of the factory. 
     */
    public void initialize(String id, ConfigMap configMap) {}

    /**
     * This method is called when we initialize the definition of an instance
     * which will be looked up by this factory.  It should validate that
     * the properties supplied are valid to define an instance.
     * Any valid properties used for this configuration must be accessed to
     * avoid warnings about unused configuration elements.  If your factory
     * is only used for application scoped components, this method can simply
     * return a factory instance which delegates the creation of the component
     * to the FactoryInstance's lookup method.
     */
    public FactoryInstance createFactoryInstance(String id, ConfigMap properties)
    {
        SpringFactoryInstance instance = new SpringFactoryInstance(this, id, properties);
        instance.setSource(properties.getPropertyAsString(SOURCE, instance.getId()));
        return instance;
    } // end method createFactoryInstance()

    /**
     * Returns the instance specified by the source
     * and properties arguments.  For the factory, this may mean
     * constructing a new instance, optionally registering it in some other
     * name space such as the session or JNDI, and then returning it
     * or it may mean creating a new instance and returning it.
     * This method is called for each request to operate on the
     * given item by the system so it should be relatively efficient.
     * <p>
     * If your factory does not support the scope property, it
     * report an error if scope is supplied in the properties
     * for this instance.
     */
    public Object lookup(FactoryInstance inst)
    {
        SpringFactoryInstance factoryInstance = (SpringFactoryInstance) inst;
        return factoryInstance.lookup();
    }


    static class SpringFactoryInstance extends FactoryInstance
    {
        SpringFactoryInstance(SpringFactory factory, String id, ConfigMap properties)
        {
            super(factory, id, properties);
        }


        public String toString()
        {
            return "SpringFactory instance for id=" + getId() + " source=" + getSource() + " scope=" + getScope();
        }

        public Object lookup()
        {
            ApplicationContext appContext = WebApplicationContextUtils.getWebApplicationContext(flex.messaging.FlexContext.getServletConfig().getServletContext());
            String beanName = getSource();

            try
            {
                return appContext.getBean(beanName);
            }
            catch (NoSuchBeanDefinitionException nexc)
            {
                ServiceException e = new ServiceException();
                String msg = "Spring service named '" + beanName + "' does not exist.";
                e.setMessage(msg);
                e.setRootCause(nexc);
                e.setDetails(msg);
                e.setCode("Server.Processing");
                throw e;
            }
            catch (BeansException bexc)
            {
                ServiceException e = new ServiceException();
                String msg = "Unable to create Spring service named '" + beanName + "' ";
                e.setMessage(msg);
                e.setRootCause(bexc);
                e.setDetails(msg);
                e.setCode("Server.Processing");
                throw e;
            }
        }
       
    }

}

4.在services-config.xml加入如下代码：
<factories>
　　id就是remoting-config.xml <factory>spring<factory>　;
    class:具体的实现类
    <factory id="spring" class="spring.factories.SpringFactory"/>
</factories>
5.web.xml
<listener>
  <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>