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利用xml，解析yahoo天气代码~~~
<script type="text/javascript"> document.body.oncopy = function() { if (window.clipboardData) { setTimeout(function() { var text = clipboardData.getData("text"); if (text && text.length > 300) { text = text + "\r\n\n本文来自CSDN博客，转载请标明出处：" + location.href; clipboardData.setData("text", text); } }, 100); } } </script><script type="text/javascript"> function StorePage() { d = document; t = d.selection ? (d.selection.type != 'None' ? d.selection.createRange().text : '') : (d.getSelection ? d.getSelection() : ''); void (keyit = window.open('http://www.365key.com/storeit.aspx?t=' + escape(d.title) + '&u=' + escape(d.location.href) + '&c=' + escape(t), 'keyit', 'scrollbars=no,width=475,height=575,left=75,top=20,status=no,resizable=yes')); keyit.focus(); }</script> 我很菜，曾为这个天气代码搞了好几天，不过现在我终于可以实现了
网站首页上每天都能够有最新的天气情况，而不用自己手动搜集，确实方便了很多，下面我就将我的经验介绍一下

关于天气服务，我是用的yahoo提供的天气服务，网上搜索的时候，据说weather.com也提供这个服务，不过需要注册，我去看看了，甚至连注册的地方都没找到（汉自己的e文阿），就懒得用他们家的了
yahoo的天气服务地址是
http://xml.weather.yahoo.com/
在yahoo的技术支持里对于天气的代码有详细的解释
http://developer.yahoo.com/weather/

简单说来，我们可以发送请求到yahoo，它就会返回一个xml文件，请求的地址如下：
http://xml.weather.yahoo.com/forecastrss?p=CHXX0008&u=c
我们得到的xml文件格式如下：
<?xml version="1.0" encoding="UTF-8" standalone="yes" ?>
<rss version="2.0" xmlns:yweather="http://xml.weather.yahoo.com/ns/rss/1.0" xmlns:geo="http://www.w3.org/2003/01/geo/wgs84_pos#">
<channel>
<title>Yahoo! Weather - Beijing, CH</title>
<link>http://us.rd.yahoo.com/dailynews/rss/weather/Beijing__CH/*http://xml.weather.yahoo.com/forecast/CHXX0008_c.html</link>
<description>Yahoo! Weather for Beijing, CH</description>
<language>en-us</language>
<lastBuildDate>Tue, 26 Dec 2006 12:00 pm CST</lastBuildDate>
<ttl>60</ttl>
<yweather:location city="Beijing" region="" country="CH" />
<yweather:units temperature="C" distance="km" pressure="mb" speed="kph" />
<yweather:wind chill="-7" direction="300" speed="32" />
<yweather:atmosphere humidity="27" visibility="999" pressure="0" rising="2" />
<yweather:astronomy sunrise="7:35 am" sunset="4:56 pm" />
<image>
<title>Yahoo! Weather</title>
<width>142</width>
<height>18</height>
<link>http://weather.yahoo.com/</link>
<url>http://us.i1.yimg.com/us.yimg.com/i/us/nws/th/main_142b.gif</url>
</image>
<item>
<title>Conditions for Beijing, CH at 12:00 pm CST</title>
<geo:lat>39.93</geo:lat>
<geo:long>116.28</geo:long>
<link>http://us.rd.yahoo.com/dailynews/rss/weather/Beijing__CH/*http://xml.weather.yahoo.com/forecast/CHXX0008_c.html</link>
<pubDate>Tue, 26 Dec 2006 12:00 pm CST</pubDate>
<yweather:condition text="Fair" code="34" temp="0" date="Tue, 26 Dec 2006 12:00 pm CST" />
<description><![CDATA[
<img src="http://us.i1.yimg.com/us.yimg.com/i/us/we/52/34.gif" /><br />
<b>Current Conditions:</b><br />
Fair, 0 C<BR /><BR />
<b>Forecast:</b><BR />
Tue - Sunny. High: 1 Low: -8<br />
Wed - Sunny. High: 1 Low: -9<br />
<br />
<a href="http://us.rd.yahoo.com/dailynews/rss/weather/Beijing__CH/*http://xml.weather.yahoo.com/forecast/CHXX0008_c.html">Full Forecast at Yahoo! Weather</a><BR/>
(provided by The Weather Channel)<br/>
]]></description>
<yweather:forecast day="Tue" date="26 Dec 2006" low="-8" high="1" text="Sunny" code="32" />
<yweather:forecast day="Wed" date="27 Dec 2006" low="-9" high="1" text="Sunny" code="32" />
<guid isPermaLink="false">CHXX0008_2006_12_26_12_0_CST</guid>
</item>
</channel>
</rss>


看到了吧，里面有我们需要的数据，这时我们只要通过xml操作读取到里面的数据就可以了。
xml的操作我所知道有dom，sax api和jdom三种方式，随便哪一种你都可以，我用了sax这种方式

                        Weather weather=new Weather();
                        Vector vector=new Vector();
                        YahooHandler yh=new YahooHandler();

                        URL url=new URL("http://localhost:8080/daemon/weather.xml");
                        InputStream input=url.openStream();
                        SAXParserFactory factory = SAXParserFactory.newInstance();
                        factory.setNamespaceAware(false);
                        SAXParser parser = factory.newSAXParser();
                        parser.parse(input, yh);
                        vector=yh.getVector();
                        weather=(Weather)vector.elementAt(0);
在这里我有一个weather.class封装了一些weather的属性，一个yahoohandler用来解析数据
主要就是这么一些语句：

    public void startElement(String name,AttributeList attributes) throws SAXException{
        String temp_date;

        if(name.equalsIgnoreCase("item")){
            weather=new Weather();
        }else if(name.equalsIgnoreCase("yweather:condition")){
            temp_date=attributes.getValue("date");
            System.out.println("pubDate is :"+temp_date);
            //weather.setPubDate();
        }else if(name.equalsIgnoreCase("description")){
            //System.out.println("When ther is description the temp_date is :"+temp_date);
        }else if(name.equalsIgnoreCase("yweather:forecast")){
            temp_date=attributes.getValue("date");
            String day=attributes.getValue("day");
            int low=Integer.parseInt(attributes.getValue("low"));
            int high=Integer.parseInt(attributes.getValue("high"));
            String text=attributes.getValue("text");

            //将字符串日期转换为日期格式

            if(temp_sign==0){
                weather.setTodayDay(day);
                weather.setTodayLow(low);
                weather.setTodayHigh(high);
                weather.setTodayText(text);
                //System.out.println("Date is :"+temp_date+" day is :"+day+" low :"+low+" high :"+high+" text:"+text);
                temp_sign=1;
            }else if(temp_sign==1){
                weather.setTomDay(day);
                weather.setTomLow(low);
                weather.setTomHigh(high);
                weather.setTomText(text);
                //System.out.println("Date is :"+temp_date+" day is :"+day+" low :"+low+" high :"+high+" text:"+text);
                temp_sign=0;
            }

        }

其实只要自己认真分析分析，这个天气预报的抓取一点都不难~~~~

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