Flex的通信方式（四）——HTTPService_2

1、Flex中請求URL得到json的數據，然後在script中解析json數據
其中用的是HTTPService通信方式 和 navigateToURL直接訪問URL

<?xml version="1.0" encoding="utf-8"?> <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" horizontalAlign="center" verticalAlign="middle" verticalGap="15" horizontalGap="15"> <mx:Script> <!--[CDATA[ import mx.collections.ArrayCollection; import mx.rpc.events.ResultEvent; import com.adobe.serialization.json.JSON; import mx.controls.Alert; [Bindable] private var photoFeed:ArrayCollection; private function doLogin():void { trace("start send"); var params:Object = new Object(); params.username = username.text; params.password = password.text; loginCheck.send(params); trace("end send"); } private function doCancel():void { username.text = ""; password.text = ""; } private function loginHandler(event:ResultEvent):void { var rawData:String = String(event.result); //decode the data to ActionScript using the JSON API //in this case, the JSON data is a serialize Array of Objects. var arr:Array = (JSON.decode(rawData) as Array); var dataArray:ArrayCollection = new ArrayCollection(arr); //arraySize = dataArray.length; // info.text = event.result.toString(); var obj:Object = JSON.decode(rawData); if(obj.status==1){ var request:URLRequest = new URLRequest(); request.method = URLRequestMethod.GET; request.url = "http://test.ntsky.com:8080/admin/posts.action"; // request. var loader:URLLoader = new URLLoader(); navigateToURL(request,"_self"); } else{ Alert.show(obj.message); } } ]]--> </mx:Script> <mx:HTTPService id="loginCheck" url="http://test.ntsky.com:8080/admin/login.action" resultFormat="text" result="loginHandler(event)" /> <mx:Panel x="330" y="192" width="290" height="177" layout="absolute" title="用戶登錄" fontSize="12" horizontalAlign="center" verticalAlign="middle"> <mx:Form x="10" y="10" width="253" height="90"> <mx:FormItem label="用戶名:"> <mx:TextInput id="username"/> </mx:FormItem> <mx:FormItem label="密 碼 :"> <mx:TextInput id="password" displayAsPassword="true"/> </mx:FormItem> </mx:Form> <mx:Button x="65" y="103" label="登錄" click="doLogin()"/> <mx:Button x="144" y="103" label="取消" click="doCancel()"/> </mx:Panel> </mx:Application>  

 

2、Java中進行數據處理得到json格式的數據,部分代碼 

/** * 瀏覽器直接返回信息 * * @param content 內容 * @param character 編碼 * @throws IOException */ protected void out(String content,String character) throws IOException { HttpServletResponse response = ServletActionContext.getResponse(); response.setContentType("text/html;charset="+character); PrintWriter out = response.getWriter(); out.print(content); out.flush(); out.close(); } try{ Author author = authorService.getAuthorByName(username); if( author==null ){ JSONObject json = new JSONObject(); json.put("status","0"); json.put("message","用戶名不存在"); super.out(json.toString()); } if(author.getPassword().equals(MD5.md5(password))){ session.put(Symbols.SESSION_AUTHOR, author); JSONObject json = new JSONObject(); json.put("status","1"); json.put("message","登錄成功"); super.out(json.toString()); } else{ JSONObject json = new JSONObject(); json.put("status","0"); json.put("message","密碼錯誤"); super.out(json.toString()); } } catch(ServiceException se){ JSONObject json = new JSONObject(); json.put("status","0"); json.put("message","登錄失敗"); super.out(json.toString()); throw new Exception(se); } finally { } return NONE;  

補充：JSON快速入門簡易介紹：http://baike.baidu.com/view/136475.htm?fr=ala0