AMF(Action Message Format)在开发Flash/Flex应用中使用频率是非常高的,相对普通的HTTP、WebService的SOAP等多种数据通信方式的效率更高,有人曾经做过这方面的测试,详细可以访问: http://xinsync.xju.edu.cn/index.php/archives/2162。本文将结合FluorineFx来提供通信服务接口,在客户端通过Flex来访问,简单的介绍下关于使用FluorineFx的AMF(Action Message Format)协议通信的用法。
首先建立一个FluorineFx服务库,并建立一个数据传输对象(DTO),为该对象添加
[FluorineFx.TransferObject]表示该对象可以用作于FluorineFx的数据传输对象,这个对象将会在本文后面用到,如下代码块:
namespace
FxDotNet.Services.DTO
{
[FluorineFx.TransferObject]
public
class
Book
{
public
int
ID {
get
;
set
; }
public
string
Name {
get
;
set
; }
public
string
Author {
get
;
set
; }
public
double
Price {
get
;
set
; }
public
Book()
{ }
public
Book(
int
id,
string
name,
string
author,
double
price)
{
this
.ID
=
id;
this
.Name
=
name;
this
.Author
=
author;
this
.Price
=
price;
}
}
}
接下来就需要提供一个FluorineFx的远程服务(即标记有[RemotingService]的对象),通过该服务提供对外访问的方法接口,如下代码块:
namespace
FxDotNet.Services
{
[RemotingService]
public
class
DataServices
{
public
DataServices()
{
}
///
<summary>
///
获取服务端的系统时间
///
</summary>
///
<returns></returns>
public
string
GetServerTime()
{
return
DateTime.Now.ToString();
}
public
ArrayCollection GetBooks()
{
ArrayCollection array
=
new
ArrayCollection();
array.Add(
new
Book(
1
,
"
三国演义
"
,
"
罗贯中
"
,
100.00
));
array.Add(
new
Book(
2
,
"
西游记
"
,
"
吴承恩
"
,
200.00
));
array.Add(
new
Book(
3
,
"
水浒传
"
,
"
施耐庵
"
,
300.00
));
array.Add(
new
Book(
4
,
"
红楼梦
"
,
"
曹雪芹
"
,
400.00
));
return
array;
}
}
}
通过FluorineFx网站来宿主该远程服务,通过Flex的配置文件services-config.xml配置远程访问的AMF连接通道。
<
channels
>
<
channel-definition
id
="my-amf"
class
="mx.messaging.channels.AMFChannel"
>
<
endpoint
uri
="http://{server.name}:{server.port}/{context.root}/Gateway.aspx"
class
="flex.messaging.endpoints.AMFEndpoint"
/>
<
properties
>
</
properties
>
</
channel-definition
>
</
channels
>
FluorineFx提供的远程服务(RemotingService),使用Flex、Flash或Silverlight开发的客户端都是可以访问的,要实现客户端的远程调用其实是很简单的,这里以Flex作为示例进行演示,设置通信协议为AMF3,然后直接调用当前连接到服务器端连接对象的call()方法就可以实现远程调用,详细请查看下面完整的Flex示例。
<?
xml version
=
"
1.0
"
encoding
=
"
utf-8
"
?>
<
mx:Application xmlns:mx
=
"
http://www.adobe.com/2006/mxml
"
layout
=
"
absolute
"
creationComplete
=
"
init()
"
fontSize
=
"
12
"
>
<
mx:Script
>
<!
[CDATA[
import mx.collections.ArrayCollection;
import mx.controls.List;
import mx.rpc.events.FaultEvent;
import mx.rpc.events.ResultEvent;
private
var nc:NetConnection;
private
var rs:Responder;
private
function init():
void
{
nc
=
new
NetConnection();
rs
=
new
Responder(onResult,onStatus);
nc.objectEncoding
=
ObjectEncoding.AMF3;
nc.connect(
"
http://localhost:2311/FxDotNet.Web/Gateway.aspx
"
);
nc.client
=
this
;
}
private
function onResult(result:String):
void
{
this
.lbServerTime.text
=
"
服务端系统时间为:
"
+
result;
}
private
function onStatus(
event
:Object):
void
{
trace(
"
Error
"
);
}
private
function getServerTime(
event
:MouseEvent):
void
{
//
服务器端所提供的RemotingService的全限定名
nc.call(
"
FxDotNet.Services.DataServices.GetServerTime
"
,rs);
}
]]
>
</
mx:Script
>
<
mx:Button x
=
"
19
"
y
=
"
28
"
label
=
"
获取服务器系统时间
"
click
=
"
getServerTime(event)
"
/>
<
mx:Label x
=
"
19
"
y
=
"
60
"
width
=
"
402
"
id
=
"
lbServerTime
"
/>
</
mx:Application
>
同样可以使用AMF来做大数据的传输,比如要传递一个集合、数组、DataTable或是DataSet等,下面以集合做为示例演示,ActionScript 3.0中新增了ArrayCollectin类,FluorineFx在服务器端对ActionScript 3.0的ArrayCollection对进行了序列化映射封装,服务端
FluorineFx.AMF3.ArrayCollection类型的对象可以直接被客户端的ArrayCollection所接收。
如上面FluorineFx所提供的远程服务接口中的GetBooks()方法,Flex调用此方法就会得到一个ArrayCollection对象,通过调试跟踪返回的数据可以很清楚的分析这些数据,如下图示:
详细请看下面的Flex完整示例代码:
<?
xml version
=
"
1.0
"
encoding
=
"
utf-8
"
?>
<
mx:Application xmlns:mx
=
"
http://www.adobe.com/2006/mxml
"
layout
=
"
absolute
"
fontSize
=
"
12
"
width
=
"
541
"
height
=
"
302
"
creationComplete
=
"
init()
"
>
<
mx:Script
>
<!
[CDATA[
import mx.collections.ArrayCollection;
import mx.controls.List;
import mx.rpc.events.FaultEvent;
import mx.rpc.events.ResultEvent;
private
var nc:NetConnection;
private
var rs:Responder;
private
function init():
void
{
nc
=
new
NetConnection();
rs
=
new
Responder(onResult,onFault);
nc.objectEncoding
=
ObjectEncoding.AMF3;
nc.connect(
"
http://localhost:2311/FxDotNet.Web/Gateway.aspx
"
);
nc.client
=
this
;
}
private
function getBook(
event
:MouseEvent):
void
{
nc.call(
"
FxDotNet.Services.DataServices.GetBooks
"
,rs);
}
private
function onResult(result:ArrayCollection):
void
{
this
.bookGrid.dataProvider
=
result;
}
private
function onFault(
event
:Object):
void
{
trace(
"
Error
"
);
}
]]
>
</
mx:Script
>
<
mx:Button x
=
"
44
"
y
=
"
46
"
label
=
"
获取图书信息
"
click
=
"
getBook(event)
"
/>
<
mx:DataGrid x
=
"
44
"
y
=
"
78
"
id
=
"
bookGrid
"
>
<
mx:columns
>
<
mx:DataGridColumn headerText
=
"
编号
"
dataField
=
"
ID
"
/>
<
mx:DataGridColumn headerText
=
"
书名
"
dataField
=
"
Name
"
/>
<
mx:DataGridColumn headerText
=
"
作者
"
dataField
=
"
Author
"
/>
<
mx:DataGridColumn headerText
=
"
价格
"
dataField
=
"
Price
"
/>
</
mx:columns
>
</
mx:DataGrid
>
</
mx:Application
>
除了使用FluorineFx所提供的ArrayCollection外,同样可以使用我们熟悉的Object[],List<Object>,DataTable等常用类型来作为数据返回的类型,其中Object[]和List<Object>类型的数据返回到客户段能够直接被客户端所接收,如下使用Object[]作数据返回类型的代码块:
/*
************服务端方法************
*/
public
Book[] GetBookArray()
{
Book[] book
=
new
Book[]
{
new
Book(
1
,
"
三国演义
"
,
"
罗贯中
"
,
100.00
),
new
Book(
2
,
"
西游记
"
,
"
吴承恩
"
,
200.00
),
new
Book(
3
,
"
水浒传
"
,
"
施耐庵
"
,
300.00
),
new
Book(
4
,
"
红楼梦
"
,
"
曹雪芹
"
,
400.00
)
};
return
book;
}
/*
************客户端方法************
*/
private
function onResult(result:Array):
void
{
//
}
下面是以List<Object>类型返回的代码示例代码,客户段可以使用ArrayCollection直接接收:
/*
************服务端方法************
*/
///
<summary>
///
以泛型类型返回给客户端
///
</summary>
///
<returns></returns>
public
List
<
Book
>
GetBookList()
{
List
<
Book
>
list
=
new
List
<
Book
>
{
new
Book(
1
,
"
三国演义
"
,
"
罗贯中
"
,
100.00
),
new
Book(
2
,
"
西游记
"
,
"
吴承恩
"
,
200.00
),
new
Book(
3
,
"
水浒传
"
,
"
施耐庵
"
,
300.00
),
new
Book(
4
,
"
红楼梦
"
,
"
曹雪芹
"
,
400.00
)
};
return
list;
}
/*
************客户端方法************
*/
private
function onResult(result:ArrayCollection):
void
{
//
}
如果要使用DataTable类型做方法的数据返回类型就需要注意下,服务器端直接返回DataTable类型的数据客户端是不能直接接收解析的,要使客户断方便解析所返回的DataTable类型数据,FluorineFx提供了DataTableTypeAttribute,为返回DataTable类型的方法加上DataTableTypeAttribute后返回给客户端,客户端就可以直接使用ArrayCollection接收了。
返回DataTable类型
/******************服务端方法***********************/
[DataTableType("Book", "FxDotNet.Services.DTO.Book")]
public DataTable GetBookTable()
{
DataTable dt = new DataTable("Book");
dt.Columns.Add("ID", typeof(int));
dt.Columns.Add("Name", typeof(string));
dt.Columns.Add("Author", typeof(string));
dt.Columns.Add("Price", typeof(double));
DataRow dr = dt.NewRow();
dr["ID"] = 1;
dr["Name"] = "《三国演义》";
dr["Author"] = "罗贯中";
dr["Price"] = 100.00;
dt.Rows.Add(dr);
dr = dt.NewRow();
dr["ID"] = 2;
dr["Name"] = "《西游记》";
dr["Author"] = "吴承恩";
dr["Price"] = 200.00;
dt.Rows.Add(dr);
dr = dt.NewRow();
dr["ID"] = 3;
dr["Name"] = "《水浒传》";
dr["Author"] = "施耐庵";
dr["Price"] = 300.00;
dt.Rows.Add(dr);
dr = dt.NewRow();
dr["ID"] = 4;
dr["Name"] = "《红楼梦》";
dr["Author"] = "曹雪芹";
dr["Price"] = 400.00;
dt.Rows.Add(dr);
return dt;
}
/******************客户端方法***********************/
private function onResult(result:ArrayCollection):void
{
//do other
}
关于FluorineFx的AMF就简单介绍这些,要想了解更多的Flex客户端与.NET服务器端通信,可以访问
这里 。
本文示例代码下载
FluorineFxAMF.rar