Flex学习笔记(Flex 通过 Spring 和J2EE交互 )

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Flex + Spring 
1、
View页面中
 

<mx:RemoteObject 
id="userManagementDataService"  destination="UserManagementDataService"/>

2、
destination  对应于remote-config.xml中的destination节点
remote-config.xml

 <destination id="UserManagementDataService">
		<properties>
			<factory>mySpring</factory>   
			<source>UserManagementDataService</source>
		</properties>
	</destination>

<factory>mySpring</factory>
就是通过它调用applicationContext.xml 中bean节点的，

<source>UserManagementDataService</source>
对应于bean节点的id

3、
mySpring是自己写的类，在services-config.xml中有相应的配置

<factories>
<factory id="mySpring" class="springFactory.SpringFactory"/>
</factories>

4、
这里的 class 是要自己写的类，也就是 SpringFactory 类
(注意这里要引入jar包 spring.jar(WebApplicationContextUtils))

(可能还要引的包有 commons-dbcp.jar  , commons-pool-1.4.jar)

package springFactory;

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

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


public class SpringFactory implements FlexFactory
{
    private static final String SOURCE = "source";

    public void initialize(String id, ConfigMap configMap) {}

    public FactoryInstance createFactoryInstance(String id, ConfigMap properties)
    {
        SpringFactoryInstance instance = new SpringFactoryInstance(this, id, properties);
        instance.setSource(properties.getPropertyAsString(SOURCE, instance.getId()));
        return 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;
            }
        }
       
    }
}

5、
在Web.xml中配置 applicationContext.xml的监听

<context-param>
      <param-name>contextConfigLocation</param-name>
      <param-value>/WEB-INF/applicationContext.xml</param-value>
</context-param>
    <listener>
      <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>

6、在applicationContext.xml 中配置

 <bean 
id="UserManagementDataService" class="dataService.UserManagementDataService">
	</bean>

在页面中通过RemoteObject 通过Spring来调用J2EE中的方法了