flex_(6)Rss_Xml_View示例；

=>RssViewerApp.mxml

<?xml version="1.0" encoding="utf-8"?>

<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009"

xmlns:s="library://ns.adobe.com/flex/spark"

xmlns:mx="library://ns.adobe.com/flex/mx"

pageTitle="TheStudioOfCenyebao" minWidth="955" minHeight="600"

creationComplete="creationCompleteHandler(event)">

<fx:Script>

<![CDATA[

import com.cen.programmingas3.RssXml.RssParser;

import mx.events.FlexEvent;

/*rssParser对象*/

private var rssParser:RssParser;

/**

* 初始化*/

protected function creationCompleteHandler(event:FlexEvent):void

{

rssParser = new RssParser();

rssParser.addEventListener("dataWritten", onDataReceived);

}

private function onDataReceived(event:Event):void

{

rssTitle.text =rssParser.rssTitle;

rssText.text = rssParser.rssOutput;

}

]]>

</fx:Script>

<!--从Internet加载 RSS数据-->

<s:VGroup width="650" height="350" verticalAlign="middle" verticalCenter="0"

horizontalAlign="center" horizontalCenter="0">

<s:Panel title="从 Internet 加载 RSS数据" width="100%" height="100%">

<s:VGroup width="100%" height="100%">

<s:Label id="rssTitle" fontSize="18" width="100%"/>

<s:TextArea id="rssText" width="100%" height="100%"/>

</s:VGroup>

</s:Panel>

</s:VGroup>

</s:Application>

=>RssParser .as

package com.cen.programmingas3.RssXml

{

import flash.net.URLRequest;

import flash.net.URLLoader;

import flash.events.*;

/**

* Rss解析类：

* 由RSS XML数据转换成HTML文本；

*/

public class RssParser extends EventDispatcher {

/**

* 属性*/

/*程序标题信息*/

public var sampleTitle:String = "Working with XML;";

/*程序描述信息*/

public var sampleDescription:String = "This example shows many concepts(概念).";

/*Rss数据源地址_"http://www.weather.gov/alerts/ak.rss"*/

//public var url:String = "http://weblogs.macromedia.com/product_feeds/archives/flex/index.rdf";

public var url:String = "public/data/RssViewerXml.rss";

/*rss标题信息*/

public var rssTitle:String;

/*Rss XML对象*/

public var rssXML:XML;

/* 输出字符串*/

public var rssOutput:String;

/*URLLoader对象*/

private var myLoader:URLLoader;

/*事件对象_标志数据已经处理完成*/

private var dataWritten:Event;

/**

* 构造函数

* Initiates loading of the RSS data.

*/

public function RssParser() {

/*URLRequest对象*/

var rssXmlUrl:URLRequest = new URLRequest(url);

myLoader = new URLLoader(rssXmlUrl);

myLoader.addEventListener("complete", xmlLoaded);

}

/**

* Invoked(调用) when the RSS data is loaded. This method parses(解析) through the

* XML data by looping through each item element in the XML, extracting(提取)

* the title,description and link elements in the item element.

* The buildHTML() method returns HTML in the form of an XMLList

* object, which is converted to the rssOutput string.

* The channel.title property of the rssXML is used as the

* title for the RSS feed. When the method is complete, it dispatches

* a dataWritten event, which notifies(通知) the host application of the

* completion.

*/

public function xmlLoaded(evtObj:Event):void {

rssXML = XML(myLoader.data);

var outXML:XMLList = new XMLList();

if (rssXML.namespace("") != undefined) {

default xml namespace = rssXML.namespace("");

trace("=>rssXML.namespace_"+rssXML.namespace(""));

}

for each (var item:XML in rssXML..item) {

var itemTitle:String = item.title.toString();

var itemDescription:String = item.description.toString();

var itemLink:String = item.link.toString();

/**

* 把xml添加到xmlList对象上*/

outXML += buildItemHTML(itemTitle,

itemDescription,

itemLink);

}

/*确定 toString()和 toXMLString()方法是否对某些标签之间的空白字符进行规格化;*/

XML.prettyPrinting = false;

/*输出字符串*/

rssOutput = outXML.toXMLString();

trace("=>rssOutput_"+rssOutput);

rssTitle = rssXML.channel.title.toString();

dataWritten = new Event("dataWritten", true);

dispatchEvent(dataWritten);

}

/**

* Builds an XMLList object that represents a segment(部分) of HTML code,

* based on the three string parameters that define the title, description,

* and link information from an RSS item.

*

* The return text is of the following form:

* <b>itemTitle</b>

* <p>itemDescription

* <br />

* <a href="link">

* <font color="#008000">More...</font>

* </a>

* </p>

*/

private function buildItemHTML(itemTitle:String,

itemDescription:String,

itemLink:String):XMLList {

default xml namespace = new Namespace();

var body:XMLList = new XMLList();

body += new XML("<b>" + itemTitle + "</b>");

var p:XML = new XML("<p>" + itemDescription + "</p>");

var link:XML = <a></a>;

link.@href = itemLink; // <link href="itemLinkString"></link>

link.font.@color = "#008000"; // <font color="#008000"></font></a> // 0x008000 = green;

link.font = "More...";

p.appendChild(<br/>);

p.appendChild(link);

body += p;

return body;

}

}

}

=>RssViewerXml.rss

<?xml version='1.0' encoding='UTF-8' ?>

<rss version='2.0' xmlns:dc='http://purl.org/dc/elements/1.1/'>

<channel>

<title>

Alaska - Current Watches, Warnings and Advisories for Alaska Issued by

the National Weather Service

</title>

<link>
http://www.weather.gov/alerts/ak.html
</link>

<lastBuildDate>

Tue, 07 Feb 2006 17:28:01 EST

</lastBuildDate>

<ttl>

4

</ttl>

<language>

en-us

</language>

<managingEditor>

robert.bunge@noaa.gov

</managingEditor>

<webMaster>

w-nws.webmaster@noaa.gov

</webMaster>

<description>

Current Watches, Warnings and Advisories for Alaska Issued by the National

Weather Service

</description>

<image>

<url>
http://weather.gov/images/xml_logo.gif
</url>

<title>

NOAA - National Weather Service

</title>

<link>
http://weather.gov
</link>

</image>

<item>

<title>

Short Term Forecast - Cape Fairweather to Cape Suckling Coastal Area (Alaska)

</title>

<link>
http://www.weather.gov/alerts/ak.html#AKZ017.AYANOWYAK.221600
</link>

<description>

Short Term Forecast Issued At: 2006-02-07T22:16:00 Expired At: 2006-02-08T04:00:00

Issuing Weather Forecast Office Homepage: http://paya.arh.noaa.gov
</description>

</item>

<item>

<title>

Short Term Forecast - Taiya Inlet, Klondike Highway (Alaska)

</title>

<link>
http://www.weather.gov/alerts/ak.html#AKZ018.AJKNOWAJK.212400
</link>

<description>

Short Term Forecast Issued At: 2006-02-07T21:24:00 Expired At: 2006-02-08T01:00:00

Issuing Weather Forecast Office Homepage: http://pajk.arh.noaa.gov
</description>

</item>

<item>

<title>

Short Term Forecast - Haines Borough, Lynn Canal (Alaska)

</title>

<link>
http://www.weather.gov/alerts/ak.html#AKZ019.AJKNOWAJK.212400
</link>

<description>

Short Term Forecast Issued At: 2006-02-07T21:24:00 Expired At: 2006-02-08T01:00:00

Issuing Weather Forecast Office Homepage: http://pajk.arh.noaa.gov
</description>

</item>

<item>

<title>

Short Term Forecast - Glacier Bay (Alaska)

</title>

<link>
http://www.weather.gov/alerts/ak.html#AKZ020.AJKNOWAJK.212400
</link>

<description>

Short Term Forecast Issued At: 2006-02-07T21:24:00 Expired At: 2006-02-08T01:00:00

Issuing Weather Forecast Office Homepage: http://pajk.arh.noaa.gov
</description>

</item>

<item>

<title>

Short Term Forecast - Glacier Bay (Alaska)

</title>

<link>
http://www.weather.gov/alerts/ak.html#AKZ021.AJKNOWAJK.212400
</link>

<description>

Short Term Forecast Issued At: 2006-02-07T21:24:00 Expired At: 2006-02-08T01:00:00

Issuing Weather Forecast Office Homepage: http://pajk.arh.noaa.gov
</description>

</item>

<item>

<title>

Short Term Forecast - Cape Fairweather to Cape Suckling (Alaska)

</title>

<link>
http://www.weather.gov/alerts/ak.html#AKZ022.AJKNOWAJK.212400
</link>

<description>

Short Term Forecast Issued At: 2006-02-07T21:24:00 Expired At: 2006-02-08T01:00:00

Issuing Weather Forecast Office Homepage: http://pajk.arh.noaa.gov
</description>

</item>

<item>

<title>

Short Term Forecast - Cape Decision to Cape Fairweather (Alaska)

</title>

<link>
http://www.weather.gov/alerts/ak.html#AKZ023.AJKNOWAJK.212400
</link>

<description>

Short Term Forecast Issued At: 2006-02-07T21:24:00 Expired At: 2006-02-08T01:00:00

Issuing Weather Forecast Office Homepage: http://pajk.arh.noaa.gov
</description>

</item>

<item>

<title>

Short Term Forecast - Northern Lynn Canal (Alaska)

</title>

<link>
http://www.weather.gov/alerts/ak.html#AKZ024.AJKNOWAJK.212400
</link>

<description>

Short Term Forecast Issued At: 2006-02-07T21:24:00 Expired At: 2006-02-08T01:00:00

Issuing Weather Forecast Office Homepage: http://pajk.arh.noaa.gov
</description>

</item>

<item>

<title>

Short Term Forecast - Juneau Borough, Western Chichagof, Admiralty Island

(Alaska)

</title>

<link>
http://www.weather.gov/alerts/ak.html#AKZ025.AJKNOWAJK.212400
</link>

<description>

Short Term Forecast Issued At: 2006-02-07T21:24:00 Expired At: 2006-02-08T01:00:00

Issuing Weather Forecast Office Homepage: http://pajk.arh.noaa.gov
</description>

</item>

<item>

<title>

Short Term Forecast - Inner Channels from Kupreanof Island to Etolin Island

(Alaska)

</title>

<link>
http://www.weather.gov/alerts/ak.html#AKZ026.AJKNOWAJK.212400
</link>

<description>

Short Term Forecast Issued At: 2006-02-07T21:24:00 Expired At: 2006-02-08T01:00:00

Issuing Weather Forecast Office Homepage: http://pajk.arh.noaa.gov
</description>

</item>

<item>

<title>

Short Term Forecast - Southern Inner Channels (Alaska)

</title>

<link>
http://www.weather.gov/alerts/ak.html#AKZ027.ANTNOWANN.211600
</link>

<description>

Short Term Forecast Issued At: 2006-02-07T21:16:00 Expired At: 2006-02-08T00:00:00

Issuing Weather Forecast Office Homepage: http://pant.arh.noaa.gov
</description>

</item>

<item>

<title>

Short Term Forecast - Dixon Entrance to Cape Decision (Alaska)

</title>

<link>
http://www.weather.gov/alerts/ak.html#AKZ028.ANTNOWANN.211600
</link>

<description>

Short Term Forecast Issued At: 2006-02-07T21:16:00 Expired At: 2006-02-08T00:00:00

Issuing Weather Forecast Office Homepage: http://pant.arh.noaa.gov
</description>

</item>

<item>

<title>

Short Term Forecast - Misty Fjords (Alaska)

</title>

<link>
http://www.weather.gov/alerts/ak.html#AKZ029.ANTNOWANN.211600
</link>

<description>

Short Term Forecast Issued At: 2006-02-07T21:16:00 Expired At: 2006-02-08T03:00:00

Issuing Weather Forecast Office Homepage: http://pant.arh.noaa.gov
</description>

</item>

<item>

<title>

Short Term Forecast - Northeast Prince William Sound (Alaska)

</title>

<link>
http://www.weather.gov/alerts/ak.html#AKZ131.AVWNOWVWS.215300
</link>

<description>

Short Term Forecast Issued At: 2006-02-07T21:53:00 Expired At: 2006-02-08T03:00:00

Issuing Weather Forecast Office Homepage: http://pavw.arh.noaa.gov
</description>

</item>

<item>

<title>

Short Term Forecast - Southern Seward Peninsula Coast (Alaska)

</title>

<link>
http://www.weather.gov/alerts/ak.html#AKZ211.AOMNOWOME.192500
</link>

<description>

Short Term Forecast Issued At: 2006-02-07T19:25:00 Expired At: 2006-02-08T01:00:00

Issuing Weather Forecast Office Homepage: http://paom.arh.noaa.gov
</description>

</item>

<item>

<title>

Short Term Forecast - Middle Tanana Valley (Alaska)

</title>

<link>
http://www.weather.gov/alerts/ak.html#AKZ222.AFGNOWAFG.205700
</link>

<description>

Short Term Forecast Issued At: 2006-02-07T20:57:00 Expired At: 2006-02-08T02:00:00

Issuing Weather Forecast Office Homepage: http://pafg.arh.noaa.gov
</description>

</item>

</channel>

</rss>