Flex之旅--Flex+BlazeDS+Spring整合

Flex与服务器通讯有3中方式：HTTPService 组件访问HTTP服务，WebService 组件访问WebService服务，RemoteObject 组件访问Server端对象。第三种方法是最常用最灵活的方法，这种方式通过AMF二进制形式传递数据，需要支持AMF协议的中间件，与java通讯时使用BlazeDS(免费开源)中间件。

新建项目

新建Flex项目，服务器选择J2EE-->BlazeDS，LCDS WAR文件选择blazeds.war文件(下载地址http://download.csdn.net/detail/sjepy/4464788)，完成后在FlexDemo.mxml中添加如下代码：

<mx:DataGrid width="400" height="200">
<mx:columns>
<mx:DataGridColumn headerText="姓名" dataField="name"/>
<mx:DataGridColumn headerText="年龄" dataField="age"/>
<mx:DataGridColumn headerText="邮箱" dataField="email"/>
</mx:columns>
</mx:DataGrid>

在Servers视图中添加FlexDemo，启动服务，访问http://localhost:8080/FlexDemo/FlexDemo.html，如果出现空列表则表明项目能正常运行。

使用RemoteObject与java通讯

1.在后台新建EmployeeService，返回员工信息到前台flex

package demo.flex.service;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class EmployeeService {

public List<Map> getEmpList() {

List<Map> empList = new ArrayList<Map>();
Map emp = null;

for (int i = 0; i < 5; i++) {
emp = new HashMap();
emp.put("name", "name" + i);
emp.put("age", 20 + i);
emp.put("email", "email" + i + "@flex.demo");
empList.add(emp);
}

return empList;
}
}

2.在WEB-INF/flex/remoting-config.xml文件中添加EmployeeService 对应的 destination

<destination id="employeeService">
<properties>
<source>demo.flex.service.EmployeeService</source>
</properties>
</destination>

3.修改FlexDemo.mxml，通过RemoteObject直接调用后台EmployeeService的getEmpList()方法

<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009"
xmlns:s="library://ns.adobe.com/flex/spark"
xmlns:mx="library://ns.adobe.com/flex/mx" creationComplete="init()">
<fx:Script>
<![CDATA[
import mx.collections.ArrayCollection;
import mx.controls.Alert;
import mx.events.FlexEvent;
import mx.rpc.events.FaultEvent;
import mx.rpc.events.ResultEvent;

[Bindable]
private var empList:ArrayCollection;

protected function empRemote_resultHandler(event:ResultEvent):void
{
empList = event.result as ArrayCollection;
}

protected function empRemote_faultHandler(event:FaultEvent):void
{
Alert.show(event.toString());
}

protected function init():void
{
empRemote.getEmpList();
}
]]>
</fx:Script>
<fx:Declarations>
<s:RemoteObject id="empRemote" destination="employeeService" >
<s:method name="getEmpList" result="empRemote_resultHandler(event)" fault="empRemote_faultHandler(event)"/>
</s:RemoteObject>
</fx:Declarations>

<mx:DataGrid width="400" height="200" dataProvider="{empList}">
<mx:columns>
<mx:DataGridColumn headerText="姓名" dataField="name"/>
<mx:DataGridColumn headerText="年龄" dataField="age"/>
<mx:DataGridColumn headerText="邮箱" dataField="email"/>
</mx:columns>
</mx:DataGrid>
</s:Application>

4.重新运行项目，界面显示后台返回的员工信息。如果弹出错误信息：HTTP:Status:url:http://localhost:8080/WebContent/messagebroker/amf....打开项目根目录，修改.flexProperties文件中serverContextRoot="/WebContent"为serverContextRoot="/FlexDemo"，刷新项目重新运行。(注：我在做本测试时没有问题，但做数据推送测试时后台一直收不到前台订阅信息，浪费了很多时间，一直以为是配置问题，最后才发现是serverContextRoot的原因，建议一定修改serverContextRoot)

整合Spring

1.测试使用Spring版本为3.0.5(下载3.1.1http://download.csdn.net/detail/sjepy/5516699)，用到的jar包：

springframework及依赖包：

aopalliance.jar

aspectjweaver.jar

cglib-nodep-2.1_3.jar(下载地址http://download.csdn.net/detail/sjepy/5516813)

org.springframework.aop-3.0.5.RELEASE.jar

org.springframework.asm-3.0.5.RELEASE.jar

org.springframework.beans-3.0.5.RELEASE.jar

org.springframework.context-3.0.5.RELEASE.jar

org.springframework.core-3.0.5.RELEASE.jar

org.springframework.expression-3.0.5.RELEASE.jar

org.springframework.web.servlet-3.0.5.RELEASE.jar

org.springframework.web-3.0.5.RELEASE.jar

BlazeDS + Spring整合：

org.springframework.flex-1.0.3.RELEASE.jar(下载地址http://download.csdn.net/detail/sjepy/5516755)

2.修改web.xml，去掉所有flex相关配置(如果有的话)，添加如下配置：

<servlet>
<servlet-name>Spring MVC Dispatcher Servlet</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>
classpath:applicationContext.xml
</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>

<!-- MessageBroker Servlet flex mapping-->
<servlet-mapping>
<servlet-name>Spring MVC Dispatcher Servlet</servlet-name>
<url-pattern>/messagebroker/*</url-pattern>
</servlet-mapping>

3.在classpath下添加Spring的配置文件applicationContext.xml：

<?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:flex="http://www.springframework.org/schema/flex"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd http://www.springframework.org/schema/flex http://www.springframework.org/schema/flex/spring-flex-1.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd">

<context:component-scan base-package="demo.flex" />
<flex:message-broker/>
</beans>

4.在EmployeeService上添加注解：

@Component
@RemotingDestination	// 把EmployeeService暴露给Flex

5.删除WEB-INF/flex下除services-config.xml以外的所有配置文件，修改services-config.xml

<services>
<!--        <service-include file-path="remoting-config.xml" />-->
<!--        <service-include file-path="proxy-config.xml" />-->
<!--        <service-include file-path="messaging-config.xml" />  -->
<default-channels>
<channel ref="my-amf"/>
</default-channels>
</services>

前台代码不变，完成后重新运行项目，显示效果和前面一样，至此整合完成。

最后附完整代码下载地址：http://download.csdn.net/detail/sjepy/5522399