PHP爬取糗事百科首页糗事
突然想获取一些网上的数据来玩玩,因为有SAE的MySql数据库,让它在那呆着没有什么卵用!于是就开始用PHP编写一个爬取糗事百科首页糗事的小程序,数据都保存在MySql中,岂不是很好玩!
说干就干!首先确定思路
获取HTML源码--->解析HTML--->保存到数据库
没有什么难的
1、创建PHP文件“getDataToDB.php”,
2、获取指定URL的HTML源码
这里我用的是curl函数,详细内容参见PHP手册
代码为
<span style="font-family:Times New Roman;font-size:14px;">// 获取对应链接的HTMLCODEfunction GetHtmlCode($url) { $ch = curl_init (); // 初始化一个cur对象 curl_setopt ( $ch, CURLOPT_URL, $url ); // 设置需要抓取的网页 curl_setopt ( $ch, CURLOPT_RETURNTRANSFER, 1 ); // 设置crul参数,要求结果保存到字符串中还是输出到屏幕上 curl_setopt ( $ch, CURLOPT_CONNECTTIMEOUT, 1000 ); // 设置链接延迟 $HtmlCode = curl_exec ( $ch ); // 运行curl,请求网页 return $HtmlCode;}</span>3、引入第三方文件’simple_html_dom.php‘来解析HTML
这里我没有能力使用正则表达式,就在网上海搜,终于找到这个,就像Java使用Jsoup(使用Jsoup解析滁州学院官网获取新闻列表)一样,具体参见BLOG
代码如下
<span style="font-family:Times New Roman;font-size:14px;">function getFmlDataToDB() { $link = mysql_connect ( SAE_MYSQL_HOST_M . ':' . SAE_MYSQL_PORT, SAE_MYSQL_USER, SAE_MYSQL_PASS ); // 获取源码 $html = str_get_html ( GetHtmlCode ( "http://www.qiushibaike.com/" ) ); if ($link) { mysql_select_db ( SAE_MYSQL_DB, $link ); mysql_query ( 'set names utf8' ); // class="article block untagged mb15" foreach ( $html->find ( 'div[class=article block untagged mb15]' ) as $per ) { $z = null; $t = null; $w = null; $d = null; $p = null; $ds = null; $ps = null; // //作者 $author = $per->find ( 'div[class=author]' ); if ($author != null) { $a = $author [0]->find ( 'a' ); $z = $a [1]->innertext; } else { $z = 'no author'; } // 头像链接 if ($author != null) { $icon = $author [0]->find ( 'a' ); $t = $icon [0]->src->innertext; } else { $t = '...............'; } // 文章内容 $content = $per->find ( 'div[class=content]' ); $w = $content [0]->innertext; // 点赞数 $vote1 = $per->find ( 'div[class=stats]' ); $vote2 = $vote1 [0]->find ( 'span[class=stats-vote]' ); $vote3 = $vote2 [0]->find ( 'i[class=number]' ); $d = $vote3 [0]->innertext; // 评论数 $comments1 = $vote1 [0]->find ( 'span[class=stats-comments]' ); $comments2 = $comments1 [0]->find ( 'a[class=qiushi_comments]' ); $comments3 = $comments2 [0]->find ( 'i[class=number]' ); $p = $comments3 [0]->innertext; // 顶 数 $up_down = $per->find ( 'div[class=stats-buttons bar clearfix]' ); $up_down1 = $up_down [0]->find ( 'ul' ); $li = $up_down1 [0]->find ( 'li' ); $up = $li [0]->find ( 'span[class=number hidden]' ); $ds = $up [0]->innertext; // 拍 数 $down = $li [1]->find ( 'span[class=number hidden]' ); $ps = $down [0]->innertext; } } else { echo '数据库链接KO'; }}</span>这个代码写的有点纠结,我试了一下不能直接获取子节点的数据,只能从外层一层一层的剥开解析,如果有新的写法,我会更新,也请各位看官看看。
4、创建数据库,将数据插入到数据库中
这里我使用的SAE中的MySQL,具体的连接方发参见使用PHP连接SAE中的MySql数据库
需要注意的就是编码格式,区要在执行语句前加上这样一句话
<span style="font-family:Microsoft YaHei;font-size:14px;">mysql_query ( 'set names utf8' );</span>核心代码如下:
<span style="font-family:Microsoft YaHei;font-size:14px;"> $sql = "INSERT INTO `app_bmhjqs`.`db_fml` (`id`, `author`, `icon_url`, `content`, `vote`, `comments`, `up`, `down`) VALUES (NULL, '$z', '$t', '$w', '$d', '$p', '$ds', '$ps');"; // 解决乱码 mysql_query ( 'set names utf8' ); $result = mysql_query ( $sql );</span>
这样一来,获取--->解析--->插入就完成了,效果就是运行一次PHP文件,数据库就添加了糗事百科首页上的糗事!我想可不可以写个定时器,每隔一定时间就运行一次代码,这一点在java我可以实现,在php我不会,毕竟是个没长毛的小鸟!百度吧。。。搜到这样的写法
<span style="font-family:Times New Roman;font-size:14px;">// 定时器// ignore_user_abort (); // run script. in background// set_time_limit ( 0 ); // run script. forever// $interval = 30; // do every 15 minutes..// do {// echo date ( 'Y-m-d H:i:s', time () );// echo '写入数据库';// //getFmlDataToDB (); // } while ( true );</span>在文件里加上这样的代码,正好在学校断网前,发布到了SAE上,我没有测试!只能等到第二天来查看结果了!
今天早上,我迫不及待的打开电脑,打开SAE数据库,情况如下:
额滴神!受不鸟了,赶紧把定时器关掉了,写了个按钮触发事件!这样下去,数据库会被挤满的!
好了,PHP爬取糗事百科首页糗事就此完成
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