FLEX與HttpService通信

 

FLEX中調用HttpService的方法有兩種

第一種是簡單應用，適用於傳遞簡單參數或者不帶參，如調用遠程XML文件，用MXML標籤，如

<mx:HTTPService
   id="myHttpService"
   result="myResult(event)"
   fault="myFault(event)"
   method="POST"
   url="http://127.0.0.1:8080/httpService/httpservcie.do ">
  <mx:request xmlns="">
   <userName>-***</userName>
   <userPwd>***</userPwd>
  </mx:request>
 </mx:HTTPService>

需要注意的是必須定義id，result，和method（xml除外），request中傳遞參數。最後在as中調用不帶參的send方法發送請求

myHttpService.send();在 myResult(event)中對返回的結果進行處理

返回的是一個ResultEvent類

  private function myResult(event:ResultEvent){
    var msg = event.result.toString();
    Alert.show(msg);
   }

Java端serveerlet代碼

package com.lovo; import java.io.IOException; import java.io.PrintWriter; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; public class HttpService extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { this.doPost(request, response); } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { request.setCharacterEncoding("UTF-8"); response.setContentType("text/html;charset=utf-8;"); PrintWriter out = response.getWriter(); String userName = request.getParameter("userName"); String userPwd = request.getParameter("userPwd"); out.print("你輸入的姓名爲："+userName+ "密碼爲:"+userPwd); } }

在介紹第二種方法：改寫httpservice類，這裏直接參考鄭老大的代碼

 

override public function invoke(method:String, params:Object, callBackFunction:Function, resultFormat:String="xml",mouseLock:Boolean = true):void { var targetUrl:String = DataSourceConfiguration.getUrl(serviceName)["url"]; if(targetUrl.search(".xml")!= -1) { hs = new HTTPService(); hs.url = targetUrl; hs.addEventListener(FaultEvent.FAULT,faultHandler); hs.addEventListener(ResultEvent.RESULT,callBackFunction); hs.resultFormat = resultFormat; hs.send(); } else { hs = new HTTPService(); hs.url = targetUrl; hs.method = "POST"; hs.resultFormat = HTTPService.RESULT_FORMAT_XML; //var paramsXML:XML = buildXMLMessageBody(method,params); hs.addEventListener(FaultEvent.FAULT,faultHandler); hs.addEventListener(ResultEvent.RESULT,callBackFunction); var map:Object = {}; map["_service"] = serviceName; trace(serviceName); map["_operation"] = method; trace(method); for(var key:String in params) { trace("type:"+typeof(params[key])); if(typeof(params[key])=="object") { var arg:XML = VBean2XML.doConvert(key,params[key]); map[key] = arg.toXMLString(); trace(arg.toXMLString()); } else { map[key] = params[key]; trace(params[key]); } } hs.send(map); } }

 

主要是對map進行封裝，傳進調用的服務名和方法名。

接下來最關鍵的一步就是封裝參數，把Bean轉化爲XML

VBean2XML.doConvert(key,params[key]);

再將XML轉化爲XMLString，賦到參數屬性上

map[key] = arg.toXMLString();

最後調用帶參數的send方法發送請求

hs.send(map);。

在接收方面

事先規定接收數據類型，報錯的處理，和接收數據的處理

                hs.resultFormat = HTTPService.RESULT_FORMAT_XML;
               
                //var paramsXML:XML = buildXMLMessageBody(method,params);
                hs.addEventListener(FaultEvent.FAULT,faultHandler);
                hs.addEventListener(ResultEvent.RESULT,callBackFunction);

 

function callback(evt:ResultEvent):void { var data:XML = XML(evt.result); trace("guoguo"+data); var result:* = XML2VBean.doAutoConvert(data); retFun(result); }

把所取得的XML轉化爲Bean。

JAVA端代碼

//讀取服務名稱和調用方法 String srvName = request.getParameter(RPCAdapterAdvance.SERVICE_NAME); String opName = request.getParameter(RPCAdapterAdvance.OPERATION_NAME); //讀取參數 Map<String, Object> params = (Map<String, Object>) request .getParameterMap(); Set<String> keys = (Set<String>) params.keySet(); Map<String,Object> realParams = new HashMap<String,Object>(1); for (String key : keys) { if(!(StringUtils.equalsIgnoreCase(key, SERVICE_NAME) || StringUtils.equalsIgnoreCase(key, OPERATION_NAME))){ Object paramObj = ((String[])params.get(key))[0]; realParams.put(key, paramObj); } }