flex HTTPService浅析

HTTPService是一种前后台交互技术。

用于获取后台返回数据或者传递参数给后台，后台经过处理返回数据。对于flex返回的数据经常用xml格式。

这里有一个封装好的示例，正常加载返回方法resultFunction，异常返回方法faultFunction

public function doRestCall(url:String, resultFunction:Function, faultFunction:Function=null, restMethod:String='GET', parms:Object=null):void
            {
                var thttpService:HTTPService=new HTTPService();
                thttpService.method=restMethod;
                thttpService.url=url;
                thttpService.resultFormat = 'e4x';
                thttpService.addEventListener(ResultEvent.RESULT, resultFunction);
                if (faultFunction != null)
                {
                    thttpService.addEventListener(FaultEvent.FAULT, faultFunction);
                }
                thttpService.send(parms);
                thttpService.disconnect();
            }

restMethod：传递方式。

parms：需要传递的参数。（有待后续研究）

其实简易方式可以这样写：

if(httpService==null)
                {    
                    httpService=new HTTPService();
                    httpService.useProxy=false;
                    httpService.method="POST";
                    httpService.resultFormat="e4x";
                    httpService.addEventListener(ResultEvent.RESULT,ShowMsgResult);
                    httpService.addEventListener(FaultEvent.FAULT,httpFault);
                }
                httpService.url=UpLoadUrl+"?contractid="+contractno+"&pcid="+pcid+"&operate=delete&filefolder="+encodeURIComponent(path);
                httpService.send();