Spring BlazeDs 整合問題

環境：

• Spring blazeDS Integration 1.0.0 release
• blazeDS 3.2.0.3978
• jdk1.6.0_06
• flex sdk 3.2.0
• flex builder 3

在web.xml中配置DispatcherServlet

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
    id="WebApp_ID" version="2.5">
    <display-name>flex_server</display-name>
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>/WEB-INF/context-*.xml</param-value>
    </context-param>
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>
    <servlet>
        <servlet-name>flex</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>flex</servlet-name>
        <url-pattern>/messagebroker/*</url-pattern>
    </servlet-mapping>
    <welcome-file-list>
        <welcome-file>index.html</welcome-file>
    </welcome-file-list>
</web-app>

在flex-servlet.xml中定義destination

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"
    xmlns:tx="http://www.springframework.org/schema/tx" xmlns:flex="http://www.springframework.org/schema/flex"
    xsi:schemaLocation="http://www.springframework.org/schema/beans 
    http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
    http://www.springframework.org/schema/context
    http://www.springframework.org/schema/context/spring-context-2.5.xsd
    http://www.springframework.org/schema/tx
    http://www.springframework.org/schema/tx/spring-tx-2.5.xsd
    http://www.springframework.org/schema/flex   
    http://www.springframework.org/schema/flex/spring-flex-1.0.xsd">
    <flex:message-broker />
    <!-- premiumService是普通的業務bean -->
    <flex:remoting-destination ref="premiumService"/>
</beans>

這樣在remoting-config.xml中就不需要定義destination了

<?xml version="1.0" encoding="UTF-8"?>
<service id="remoting-service" 
    class="flex.messaging.services.RemotingService">

    <adapters>
        <adapter-definition id="java-object" class="flex.messaging.services.remoting.adapters.JavaAdapter" default="true"/>
    </adapters>

    <default-channels>
        <channel ref="my-amf"/>
    </default-channels>
    <!--注釋掉，否則啟動會報錯或出現其他問題
    <destination id="premiumService">
        <properties>
            <source>org.hag.flex.service.PremiumService</source>
        </properties>
    </destination>
    -->
</service>

測試

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
    creationComplete="premiumService.getPremiumList()">
    <mx:Script>
        <![CDATA[
            <!-- 省略import -->
            private function resultHandler(evt:ResultHandler):void
            {
                Alert.show(evt.result.toString());
            }
            private function faultHandler(evt:FaultHandler):void
            {
                Alert.show(evt.fault.toString());
            }
        ]]>
    </mx:Script>
    <mx:RemoteObject id="premiumService" ref="premiumService"
        result="resultHandler(event)" fault="faultHandler(event)"/>
</mx:Application>

結果這時候報錯，destination "premiumService" either does not exists....
原因是mxml編譯時間要根據remoting-config.xml來處理destination的定義，而我們把premiumService定義在了spring bean中,所以它根本就不知道premiumService的存在。取消掉remoting-config.xml的注釋，再次對mxml進行編譯（如修改後儲存），在瀏覽器中清除緩衝、重新整理，OK，結果出來了。

注意在tomcat啟動時又要把remoting-config.xml定義的destination注釋掉，否則會出問題(那是由於blazeds找到兩個相同的destination)。或者乾脆在其他地方建立一個檔案專門用於mxml的編譯。