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PHP采集类Snoopy抓取图片实例

Jun 06, 2016 pm 08:21 PM
php snoopy

这篇文章主要介绍了PHP采集类Snoopy抓取图片实例,Snoopy是一个强大的PHP采集类,可以用来开发一些采集程序和小偷程序,需要的朋友可以参考下

用了两天php的Snoopy这个类,发现很好用。获取请求网页里面的所有链接,直接使用fetchlinks就可以,获取所有文本信息使用fetchtext(其内部还是使用正则表达式在进行处理),还有其它较多的功能,如模拟提交表单等。


使用方法:

先下载Snoopy类,下载地址:
先实例化一个对象,然后调用相应的方法即可获取抓取的网页信息

复制代码 代码如下:


include 'snoopy/Snoopy.class.php';
   
$snoopy = new Snoopy();
   
$sourceURL = "http://www.jb51.net";
$snoopy->fetchlinks($sourceURL);
   
$a = $snoopy->results;

它并没有提供获取网页中所有图片地址的方法,自己有个需求是要获取一个页面中所有文章列表中图片地址。然后自己就写了一个,主要还是正则那里匹配重要。

复制代码 代码如下:


//匹配图片的正则表达式
 $reTag = "/PHP采集类Snoopy抓取图片实例/i";


因为需求比较特殊,只需要抓取写死htp://开头的图片(外站的图片可能使得了防盗链,想先抓取到本地)

1.抓取指定网页,并筛选出预期的所有文章地址;

2.循环抓取第一步中的文章地址,然后使用匹配图片的正则表达式进行匹配,获取页面中所有符合规则的图片地址;

3.根据图片后缀和ID(这里只有gif、jpg)保存图片---如果此图片文件存在,先将其删除再保存。

复制代码 代码如下:



    include 'snoopy/Snoopy.class.php';
   
    $snoopy = new Snoopy();
   
    $sourceURL = "http://xxxxx";
    $snoopy->fetchlinks($sourceURL);
   
    $a = $snoopy->results;
    $re = "/d+.html$/";
   
    //过滤获取指定的文件地址请求
    foreach ($a as $tmp) {
        if (preg_match($re, $tmp)) {
            getImgURL($tmp);
        }
    }
   
    function getImgURL($siteName) {
        $snoopy = new Snoopy();
        $snoopy->fetch($siteName);
       
        $fileContent = $snoopy->results;
       
        //匹配图片的正则表达式
        $reTag = "/PHP采集类Snoopy抓取图片实例/i";
       
        if (preg_match($reTag, $fileContent)) {
            $ret = preg_match_all($reTag, $fileContent, $matchResult);
           
            for ($i = 0, $len = count($matchResult[1]); $i                 saveImgURL($matchResult[1][$i], $matchResult[2][$i]);
            }
        }
    }
   
    function saveImgURL($name, $suffix) {
        $url = $name.".".$suffix;
       
        echo "请求的图片地址:".$url."
";
       
        $imgSavePath = "E:/xxx/style/images/";
        $imgId = preg_replace("/^.+/(d+)$/", "\1", $name);
        if ($suffix == "gif") {
            $imgSavePath .= "emotion";
        } else {
            $imgSavePath .= "topic";
        }
        $imgSavePath .= ("/".$imgId.".".$suffix);
       
        if (is_file($imgSavePath)) {
            unlink($imgSavePath);
            echo "

文件".$imgSavePath."已存在,将被删除

";
        }
       
        $imgFile = file_get_contents($url);
        $flag = file_put_contents($imgSavePath, $imgFile);
       
        if ($flag) {
            echo "

文件".$imgSavePath."保存成功

";
        }
    }
?>
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