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抓取腾讯天气预报的类

类的代码:

  1<?php
  2/**
  3 * 抓取腾讯天气,存储成XML
  4 * @author PeterPan
  5 * @final 2007-08-27
  6 */
  7class Weather{
  8    /**成员变量*/
  9    var $m_city_list = array();
 10    var $m_data = array();
 11    var $m_url_tpl = "http://weather.news.qq.com/inc/07_ss{city_code}.htm";
 12    var $m_url = "";
 13    var $m_city_code = "125";
 14    /**
 15     * 构造函数
 16     */
 17    function __construct($city_code=""){
 18        if ($city_code){
 19            $this->m_city_code = $m_city_code;
 20        }
 21    }
 22    function __destruct(){
 23        unset($this->m_data);
 24        unset($this->m_url_tpl);
 25        unset($this->m_url);
 26        unset($this->m_city_code);
 27    }
 28    /**
 29     * 根据$url提供的地址,读取数据
 30     *
 31     * @param unknown_type $url
 32     */
 33    function getUrlContent($url){
 34        //先尝试用file_get_contents获取
 35        if ( $data=file_get_contents($url) ){
 36            return $data;
 37        }
 38        else {
 39            $url_a = parse_url($url);
 40            if ( $url_a['scheme']!="http"&&$url_a['scheme']!="https" ){
 41                return "";
 42            }
 43            if ( empty($url_a['port']) ){
 44                $url_a['port'= 80;
 45            }
 46            //开始连接
 47            $data = "";
 48            if ( $fp=fsockopen($url_a['host'],$url_a['port'],$errno,$errstr,30) ){
 49                $request = "GET ".$url_a['path']." HTTP/1.1\r\n";
 50                $request .= "Host: ".$url_a['host']."\r\nConnection: Close\r\n\r\n";
 51                fwrite($fp,$request);
 52                $line = "";
 53                while ( $line=fread($fp,2048) ){
 54                    $data .= $line;
 55                }
 56                fclose($fp);
 57            }
 58            $pos = strpos($data,'<html>');
 59            $data = substr($data,$pos);
 60            echo $data;
 61            return $data;
 62        }
 63    }
 64    /**
 65     * 获取某个城市的天气情况,需要打开allow_url_open
 66     *
 67     * @param string    $city_code        城市代码,默认为$m_city_code指定的城市
 68     * @param int        $reget            是否重新获取,默认为0
 69     * @return array
 70     */
 71    function getWeather($city_code="",$reget=0){
 72        if ($city_code){
 73            $this->m_city_code = $city_code;
 74        }
 75        if ( $reget&&key_exists($this->m_city_code,$this->m_data) ){
 76            return $this->m_data[$this->m_city_code];
 77        }
 78        $this->m_url = str_replace("{city_code}",$this->m_city_code,$this->m_url_tpl);
 79        if ( $content = $this->getUrlContent($this->m_url) ){
 80            $content = iconv('gb2312','UTF-8',$content);
 81            $weather = array();
 82            //读取城市信息
 83            $pattern = '/<td width="151" height="82" class="wht1 lk37">(\S+)<\/td>/ims';
 84            preg_match_all($pattern,$content,$matches);
 85            $weather['city'= trim($matches[1][0]);
 86            //读取天气情况
 87            $pattern = '/<td height="77" class="wht2 lk37">.<div class="txbd">(\S+)<\/div>([^<]+)<\/td>/ims';
 88            preg_match_all($pattern,$content,$matches);
 89            $weather['desc'= trim($matches[1][0]);
 90            $weather['temperature'= trim($matches[2][0]);
 91            //获取天气详细
 92            $pattern = '/<td class="whp3 lk37">(.+)<\/td>/ims';
 93            preg_match_all($pattern,$content,$matches);
 94            $weather['detail'= trim($matches[1][0]);
 95            $weather['detail'= preg_replace('/([\r\n])[\s]+/','',$weather['detail']);
 96            $this->m_data[$this->m_city_code] = $weather;
 97            unset($weather);
 98            return $this->m_data[$this->m_city_code];
 99        }
100        else {
101            return array();
102        }
103    }
104    /**
105     * 获取页面中的所有地区
106     *
107     * @return array
108     */
109    function getAllCity(){
110        $url = "http://weather.news.qq.com/inc/07_ss125.htm";
111        if ( $content = $this->getUrlContent($url) ){
112            $content = iconv('gb2312','UTF-8',$content);
113            $city_list = array();
114            //获取城市列表
115            $pattern = '/<option (selected="selected" )?value="(\S+)">(\S+)<\/option>/ims';
116            preg_match_all($pattern,$content,$matches);
117            $c = count($matches[2]);
118            for ($i=0;$i<$c;$i++){
119                $city_list[$matches[2][$i]] = trim($matches[3][$i]);
120            }
121            $this->m_city_list = $city_list;
122            return $this->m_city_list;
123        }
124        else {
125            return array();
126        }
127    }
128    /**
129     * 获得所有城市的天气情况
130     *
131     * @return array
132     */
133    function getAllCityWeather(){
134        if ( empty($this->m_city_list) ){
135            $this->m_city_list = $this->getAllCity();
136        }
137        foreach ($this->m_city_list as $key=>$value){
138            $this->getWeather($key);
139        }
140        return $this->m_data;
141    }
142    /**
143     * 将天气信息存储到XML文件中
144     *
145     * @param string    $xml_path        文件路径
146     */
147    function saveXML($xml_path=""){
148        $xml = '<?xml version="1.0" encoding="UTF-8"?>
149        <root>
150        ';
151        foreach ($this->m_data as $key=>$value){
152            $xml .= '
153            <city code="'.$key.'" name="'.$value['city'].'">
154            <desc><![CDATA['.$value['desc'].']]></desc>
155            <temperature><![CDATA['.$value['temperature'].']]></temperature>
156            <detail><![CDATA['.$value['detail'].']]></detail>
157            </city>';
158        }
159        $xml .= '</root>';
160        if ( $xml_path ){
161            //打开并写入数据
162            if ( $fp=fopen($xml_path,"w") ){
163                fwrite($fp,$xml);
164            }
165            fclose($fp);
166        }
167        return $xml;
168    }
169    /**
170     * 从XML中读取数据
171     *
172     * @param unknown_type $xml_path
173     */
174    function loadDataFromXML($xml_path){
175        $this->m_city_list = array();
176        $this->m_data = array();
177        if ( $data=file_get_contents($xml_path) ){
178            $xml = new SimpleXMLElement($data);
179            foreach ($xml->city as $city){
180                $weather = array('city'=>'','desc'=>'','temperature'=>'','detail'=>'');
181                $code = (string)$city['code'];
182                $name = (string)$city['name'];
183                $this->m_city_list[$code= $name;
184                $weather['city'= $name;
185                $weather['desc'= (string)$city->desc;
186                $weather['temperature'= (string)$city->temperature;
187                $weather['detail'= (string)$city->detail;
188                $this->m_data[$code= $weather;
189            }
190        }
191        //var_dump($this->m_city_list);
192        var_dump($this->m_data);
193    }
194}
195?>

测试程序:
 1<?php
 2header("Content-Type: text/html; charset=UTF-8");  //设置页面编码
 3$weather_obj = new Weather();
 4//获取可用的城市
 5$city_list = $weather_obj->getAllCity();
 6var_dump($city_list);
 7echo "<br><br>";
 8//获取北京的天气情况,北京的代号是125
 9$result = $weather_obj->getWeather("125");
10var_dump($result);
11echo "<br><br>";
12//获取所有地区的天气
13$result = $weather_obj->getAllCityWeather();
14var_dump($result);
15echo "<br><br>";
16//保存数据到文件
17$xml = $weather_obj->saveXML("a.xml");
18//从文件加载数据
19$weather_obj->loadDataFromXML("a.xml");
20var_dump($weather_obj->getAllCityWeather());
21?>

posted on 2007-08-27 16:37 编程之道 阅读(2099) 评论(2)  编辑 收藏 引用 所属分类: web编程开发相关

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# re: 抓取腾讯天气预报的类  回复  更多评论   

我也来学一招
2007-12-21 12:02 | 秦歌

# qlsupmbx  回复  更多评论   

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2008-06-28 04:31 | qlsupmbx

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