Flex动态加载swc和swf中的class

   flex中比较少人使用相关的反射，主要原因是因为avm编译模式，没办法做到java般的灵活的反射，那么就比较容易失去工厂模式的灵活的特性，但是flex也有相关反射，主要是用户swc和swf的反射，可以直接在内部提取class使用。

      1、元数据捆绑问题

     相信很多朋友也遇到相关问题

   

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1. [Embed(source="resource/image/config/canvasLoading.gif" , mimeType="application/octet-stream")]  
2.         public var _loadingGif:Class;  

[Embed(source="resource/image/config/canvasLoading.gif" , mimeType="application/octet-stream")]public var _loadingGif:Class;

     如果一个项目中捆绑过多元数据就会造成swf体积过大，但是往往也要面对一个需求，就是无需修改主要的flex源代码就可以修改嵌入文件的需求，那么用swc嵌入文件，再用flex动态加载swc是最好的办法了。

   2、动态加载模块的问题

    某些项目在前端的flex有可能动态加载某些模块的源代码，这些可能动态加载的UI、utils或者一些skin，放在动态加载的swc中也是一个比较好的解决方案；

   3、Licence的动态加载

   这个是我最常用的地方。

 

     相关的用途就不描述那么多，如果有需要的朋友就可以找到优点了:

     动态加载swc

   

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1. package com.shine.framework.Swc  
2. {  
3.     import flash.display.Loader;  
4.     import flash.events.Event;  
5.     import flash.events.IOErrorEvent;  
6.     import flash.net.URLLoader;  
7.     import flash.net.URLLoaderDataFormat;  
8.     import flash.net.URLRequest;  
9.     import flash.system.ApplicationDomain;  
10.     import flash.system.LoaderContext;  
11.     import flash.utils.ByteArray;  
12.       
13.     import mx.controls.Alert;  
14.     import mx.core.UIComponent;  
15.       
16.     import nochump.util.zip.ZipEntry;  
17.     import nochump.util.zip.ZipFile;  
18.       
19.     public class SwcManager extends UIComponent  
20.     {  
21.         //swc的路径   
22.         public var swcUrl:String="";  
23.         //library swf路径   
24.         public var libraryUrl:String="";  
25.         //加载完成的方法   
26.         public var method:Function;  
27.           
28.           
29.         public function SwcManager(value:String=null,completeMethod:Function=null)  
30.         {  
31.             super();  
32.             if(value!=null){  
33.                 this.swcUrl=value;  
34.             }  
35.               
36.             if(completeMethod!=null){  
37.                 this.method=completeMethod;  
38.             }  
39.             this.visible=false;  
40.         }  
41.           
42.         //加载swc   
43.         public function loadSwc(value:String=null,completeMethod:Function=null):void{  
44.             if(value!=null){  
45.                 this.swcUrl=value;  
46.             }  
47.               
48.             if(completeMethod!=null){  
49.                 this.method=completeMethod;  
50.             }  
51.             if(this.swcUrl!=null){  
52.                 var loader:URLLoader = new URLLoader();  
53.                 loader.addEventListener(Event.COMPLETE,swcLoaded);  
54.                 loader.addEventListener(IOErrorEvent.IO_ERROR,error);  
55.                 loader.dataFormat = URLLoaderDataFormat.BINARY;  
56.                 loader.load(new URLRequest(swcUrl));  
57.             }else{  
58.                 Alert.show("不可以加载空的swc地址");  
59.             }  
60.         }  
61.           
62.           
63.         //加载swc完成   
64.         private function swcLoaded(e:Event):void  
65.         {  
66.             var byte:ByteArray = e.target.data;  
67.             byte = swc2swf(byte);  
68.             var loader:Loader = new Loader();  
69.             loader.contentLoaderInfo.addEventListener(Event.COMPLETE,libReady);  
70.             loader.contentLoaderInfo.addEventListener(IOErrorEvent.IO_ERROR,swfError);  
71.               
72.             loader.loadBytes(byte,new LoaderContext(false,ApplicationDomain.currentDomain));  
73.         }  
74.           
75.         private function error(e:Event):void{  
76.             Alert.show("加载"+this.swcUrl+"失败");  
77.         }  
78.           
79.         private function swfError(e:Event):void{  
80.             Alert.show("加载"+this.swcUrl+"swf失败");  
81.         }  
82.           
83.           
84.         //加载library 完成    
85.         private function libReady(e:Event):void  
86.         {  
87.             if(method!=null)  
88.                 method.call(this);  
89.         }  
90.           
91.         //解压   
92.         public function swc2swf(byte:ByteArray):ByteArray  
93.         {  
94.             var zipFile:ZipFile = new ZipFile(byte);  
95.             var zipEntry:ZipEntry = null;  
96.             if(libraryUrl!=null&&libraryUrl.length!=0)  
97.                 zipEntry = zipFile.getEntry(libraryUrl);  
98.             else  
99.                 zipEntry = zipFile.getEntry("library.swf");  
100.             return zipFile.getInput(zipEntry);  
101.         }  
102.           
103.     }  
104. }  

package com.shine.framework.Swc{import flash.display.Loader;import flash.events.Event;import flash.events.IOErrorEvent;import flash.net.URLLoader;import flash.net.URLLoaderDataFormat;import flash.net.URLRequest;import flash.system.ApplicationDomain;import flash.system.LoaderContext;import flash.utils.ByteArray;import mx.controls.Alert;import mx.core.UIComponent;import nochump.util.zip.ZipEntry;import nochump.util.zip.ZipFile;public class SwcManager extends UIComponent{//swc的路径public var swcUrl:String="";//library swf路径public var libraryUrl:String="";//加载完成的方法public var method:Function;public function SwcManager(value:String=null,completeMethod:Function=null){super();if(value!=null){this.swcUrl=value;}if(completeMethod!=null){this.method=completeMethod;}this.visible=false;}//加载swcpublic function loadSwc(value:String=null,completeMethod:Function=null):void{if(value!=null){this.swcUrl=value;}if(completeMethod!=null){this.method=completeMethod;}if(this.swcUrl!=null){var loader:URLLoader = new URLLoader();loader.addEventListener(Event.COMPLETE,swcLoaded);loader.addEventListener(IOErrorEvent.IO_ERROR,error);loader.dataFormat = URLLoaderDataFormat.BINARY;loader.load(new URLRequest(swcUrl));}else{Alert.show("不可以加载空的swc地址");}}//加载swc完成private function swcLoaded(e:Event):void{var byte:ByteArray = e.target.data;byte = swc2swf(byte);var loader:Loader = new Loader();loader.contentLoaderInfo.addEventListener(Event.COMPLETE,libReady);loader.contentLoaderInfo.addEventListener(IOErrorEvent.IO_ERROR,swfError);loader.loadBytes(byte,new LoaderContext(false,ApplicationDomain.currentDomain));}private function error(e:Event):void{Alert.show("加载"+this.swcUrl+"失败");}private function swfError(e:Event):void{Alert.show("加载"+this.swcUrl+"swf失败");}//加载library 完成 private function libReady(e:Event):void{if(method!=null)method.call(this);}//解压public function swc2swf(byte:ByteArray):ByteArray{var zipFile:ZipFile = new ZipFile(byte);var zipEntry:ZipEntry = null;if(libraryUrl!=null&&libraryUrl.length!=0)zipEntry = zipFile.getEntry(libraryUrl);elsezipEntry = zipFile.getEntry("library.swf");return zipFile.getInput(zipEntry);}}}                    

   使用教程

   首先动态加载swc

  

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1. var swcManage:SwcManager =new SwcManager;  
2.             swcManage.loadSwc("framework.swc",loadComplete);  

var swcManage:SwcManager =new SwcManager;swcManage.loadSwc("framework.swc",loadComplete);

  其次实例化object

 

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1. private function loadComplete():void{  
2. var o:Object=ReferenceUtil.referenceClass("Licence.file::LicenceFile");  
3. }  

private function loadComplete():void{var o:Object=ReferenceUtil.referenceClass("Licence.file::LicenceFile");}

 获取到swc中的实例就可以非常容易做相关的操作；

 

  另外附上动态加载swf源代码

 

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1. package com.shine.framework.Swf  
2. {  
3.     import flash.display.Loader;  
4.     import flash.events.Event;  
5.     import flash.net.URLRequest;  
6.       
7.     import mx.controls.Alert;  
8.     import mx.core.UIComponent;  
9.       
10.     public class SwfManager extends UIComponent  
11.     {  
12.         //swc的路径   
13.         public var swfUrl:String="";  
14.         //加载完成的方法   
15.         public var method:Function;  
16.           
17.         public function SwfManager(value:String=null,completeMethod:Function=null)  
18.         {  
19.             super();  
20.               
21.             if(value!=null){  
22.                 this.swfUrl=value;  
23.             }  
24.               
25.             if(completeMethod!=null){  
26.                 this.method=completeMethod;  
27.             }  
28.         }  
29.           
30.         //加载swf   
31.         public function loadSwf(value:String=null,completeMethod:Function=null):void{  
32.             if(value!=null){  
33.                 this.swfUrl=value;  
34.             }  
35.               
36.             if(completeMethod!=null){  
37.                 this.method=completeMethod;  
38.             }  
39.               
40.             if(this.swfUrl!=null){  
41.                 var loader:Loader = new Loader();    
42.                 loader.contentLoaderInfo.addEventListener(Event.COMPLETE ,swfLoaded);    
43.                 loader.load(new URLRequest(this.swfUrl));  
44.             }else{  
45.                 Alert.show("不可以加载空的swc地址");  
46.             }  
47.         }  
48.           
49.         //加载swc完成   
50.         private function swfLoaded(e:Event):void  
51.         {  
52.             if(method!=null)  
53.                 method.call(this);  
54.         }  
55.     }  
56. }