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HomeBackend DevelopmentPHP TutorialWin+PHP+IECapt完整实现网页批量截图并创建缩略图

     最近在开发一个本地互联网应用的项目,为了增加用户体验,需要在搜索结果左侧显示如图一所示的某个网站的缩略图效果,在网上不停地百度谷歌了一上午后,发现大多数实现少量截图还是可以的,如果大批量的截图总会在中途出现很多问题,最终也没有发现十分满意的程序,干脆自己弄吧。



(图一)

下面是在windows环境下用php结合iecapt实现的网页截图并创建缩略图的步骤和代码:

一、准备

 下载最新版IECapt

 官方地址:http://iecapt.sourceforge.net/

 在linux环境下,可以考虑用HTML2Image来实现

 下载地址:http://www.guangmingsoft.net/htmlsnapshot/html2image.i386.tar.gz

 其它的实现方式还有CutyCapt,另外,只要是windows环境,有IE浏览器(推荐使用IE7)即可,这个大部分机器都应该不是问题。

二、创建数据表(这一步非必须,根据实际情况选用)

 因为要批量截图,数据十分的多,建立一个数据表来存放要截图的网站的url地址还是有必要的,如下所示(mysql数据库表):

CREATE TABLE IF NOT EXISTS `t_url` (  `id` int(11) unsigned NOT NULL AUTO_INCREMENT,  `url` varchar(100) NOT NULL,  `pictype` tinyint(1) unsigned NOT NULL COMMENT '1.非比例缩略图2比例缩略图     `flag` tinyint(1) NOT NULL DEFAULT '1' COMMENT '0.禁用1.可用  PRIMARY KEY (`id`)) ENGINE=MyISAM DEFAULT CHARSET=gbk COMMENT='url链接表' AUTO_INCREMENT=1 ;

三、创建批处理文件

  1.首先把下载的iecapt压缩包解压,然后把iecapt.exe放到要生成截图的文件夹下(如:img_tmp)。

为了便于理解,在看下面代码前,先创建一个test.bat文件,鼠标右击编辑,写入一句话if not exist ay360cn.jpg (iecapt.exe --url=http://www.ay360.cn/ --out=ay360cn.jpg)保存,双击运行test.bat看看是否会在本目录下多出一个名叫ay360cn.jpg的文件,如果看到说明截图成功,这句话是截图的核心语句。 

 2.将需要截图的url链接导入url链接表t_url,然后执行如下php代码:  

 1 <?php 2  3 //------------------------------------------------------------ 4 //从表t_url中提取url链接,存放到数组$data中 5 //-------------------------------------------------------------- 6   7 mysql_connect("localhost","root","123"); 8 mysql_select_db("test"); 9 $sql = "select * from t_url";10 //选用sql语句$sql2 = "select * from t_url where pictype = 1 and flag = 1";11 12 $query = mysql_query($sql); 13 14 //------------------------------------------15 //生成批处理文件16 //------------------------------------------17 18 $expire_time = 10;   //代表10天,文件过期时间,86400秒/天19 $i = 0;20 foreach($row = mysql_fetch_array($query)){21   $url_md5 = md5($row['url']);22   $file_folder = 'img/';23   $filename = $file_folder.$url_md5.'.'.'jpg';24   $newname = $url_md5.'.'.'jpg'; 25 26   if (!file_exists($filename) || (filemtime ($filename) + $expire_time * 86400 < time()) ) {   27 28        $str .= "if not exist ".$newname." (iecapt.exe --url=".$value['url']." --out=".$newname.")\r\n";             29 30        if(($i % 30) == 0 && $i > 0){     //每30条为一个批处理文件31               $title = "title capt".$i.".bat\r\n";32               $str = $title.$str;      33               $file_bat = fopen("img_tmp/capt".$i.".bat","w");              34 35               if(fwrite($file_bat,$str)){36                 echo "批处理文件capt".$i."生成成功<br>";37                 $str = "";38               }    39        }     40        $i = $i+1;41   }        42 }   43 ?>

运行结果:

(图二)

四、执行批处理文件

  可以通过php程序循环执行 批处理文件,但在运行当中会出现很多问题,这里手动直接批量打开上面刚创建好的批处理文件,考虑到带宽和cpu,最多不要超过20个,截图的速度大约3-5秒/张效果如图三:


(图三)

五、创建缩略图

  生成缩略图的文件是create_image_img.php,其中包含生成缩略图的主要的一个类文件是image.class.php,两个文件的代码如下:

ceate_image_img.php代码:

 1 <?php  2 mysql_connect("localhost","root","123456"); 3 mysql_select_db("test"); 4   5  6 if(!isset($_GET['ID'])){ 7   $_GET['ID'] = 1; 8 }  9 10 if($_GET['ID']){   11   $sql = "select * from t_url id =".$_GET['ID'];12   $query = mysql_query($sql);13   $row = mysql_fetch_array($query); 14 15   echo "<span style='color:#CE0000;'>正在生成缩略图:</span>".$row['id']." ".$row['url']."<br><br>"; 16 17     $url = $row['url'];  18     $url_md5 = md5($url);19     $pictype = $row['pictype'];      20 21     $limit_time = 1;                                                  //创建  $limit_time日内创建的大图,天22     $thumbnails_folder = 'img_tmp/';                         //保存临时大图的目录,必须以/结束23     $thumbnails_folder2 = 'img/';                              //保存小图的目录,必须以/结束       24     $output_format = 'jpg'; 25     $cached_filename = $thumbnails_folder.$url_md5.".".$output_format;26 27     $to_filename = $thumbnails_folder2 .$url_md5.'.'.$output_format;      28 29        if((file_exists($cached_filename) || filemtime ($filename) + $limit_time*86400 > time())30           && !file_exists($to_filename)){      31 32           if (filesize($cached_filename) > 1024){  //字节,不能是空白图片33              //创建缩略图34                 include("image.class.php");35                 $img = new Zubrag_image;      36 37                 // get parameters38                 $img->image_type   = 2; // 1 = GIF, 2 = JPG, 3 = PNG39                 $img->quality      = 80;40                 $img->max_w        = 90;41                 $img->max_h        = 67;42                 $img->iscapt = ($pictype == 1) ? true : false;  //此处用布尔型即可,数据库不可1.非比例缩略图2.按比例缩略               43 44                 if($img->GenerateThumbFile($cached_filename, $to_filename)){    45                   echo "<span style='color:#CE0000;'>成功创建缩略图:</span>".$row['id']." ".$row['url'];   46                 }else{       47                   echo "<span style='color:#0000CE;'>未能创建缩略图:</span>".$row['id']." ".$row['url'];48                 }    49            }     50        } 51 52   $sql = "select * from t_url id >".$_GET['ID']." and flag = 1 order by id asc limit 1";53   $query = mysql_query($sql);54   $row = mysql_fetch_array($query); 55 56   echo "<br><span style='color:#0000CE;'>准备生成缩略图:</span>".$row['id']." ".$row['url']."<br><br>"; 57 58   if($row['id']){    59     echo "<script>window.location.href='create_image_img.php?ID=".$row['id']."';</script>";60   }else{61     $_GET['ID'] = "";62   }    63 } 64 65 ?>

image.class.php代码:

 1 <?php 2  3 class Zubrag_image {  4  5   var $iscapt = true; 6   var $image_type = -1; 7   var $quality = 100; 8   var $max_w = 100; 9   var $max_h = 100; 10 11   function SaveImage($im, $filename) { 12     $res = null;    13     if(($this->image_type == 1)  && !function_exists('imagegif')) $this->image_type = 3; 14     switch ($this->image_type) {15       case 1:16         //if ($this->save_to_file) {17           $res = ImageGIF($im,$filename);18         //}19         //else {20         //  header("Content-type: image/gif");21         //  $res = ImageGIF($im);22         //}23         break;24       case 2:       25           $res = ImageJPEG($im,$filename,$this->quality);      26         break;27       case 3:       28           $res = ImagePNG($im,$filename);        29         break;30     }  31     return $res;32   } 33 34   function ImageCreateFromType($type,$filename) {35      $im = NULL;36      switch ($type) {37        case 1:38          $im = ImageCreateFromGif($filename);39          break;40        case 2:41          $im = ImageCreateFromJpeg($filename);42          break;43        case 3:44          $im = ImageCreateFromPNG($filename);45          break;46     }47     return $im;48   }49 50 51   function GenerateThumbFile($from_name, $to_name) {    52     list($orig_x, $orig_y, $orig_img_type, $img_sizes) = GetImageSize($from_name);  53     /*if ($this->cut_x > 0) $orig_x = min($this->cut_x, $orig_x);54     if ($this->cut_y > 0) $orig_y = min($this->cut_y, $orig_y);*/55        if ($this->iscapt && (($orig_y/$orig_x) > (90/67))) {  //是截图,且高度过高   56           $orig_y = $orig_x*(67/90);          57        }58 59     $this->image_type = ($this->image_type != -1 ? $this->image_type : $orig_img_type);   60 61     if ($orig_img_type < 1 or $orig_img_type > 3) die("Image type not supported");      62 63     if ($this->image_type == 1) {     64       $ni = imagecreate($this->max_w, $this->max_h);65     }66     else {     67       $ni = imagecreatetruecolor($this->max_w,$this->max_h);68     } 69 70     $white = imagecolorallocate($ni, 255, 255, 255);71     imagefilledrectangle( $ni, 0, 0, $this->max_w, $this->max_h, $white);        72 73     $im = $this->ImageCreateFromType($orig_img_type,$from_name);   74     imagepalettecopy($ni,$im);   75     imagecopyresampled(76       $ni, $im,             77       0, 0, 0, 0,          78       $this->max_w, $this->max_h,   79       $orig_x, $orig_y);       80     if($this->SaveImage($ni, $to_name)){81          return true;82     }else{83          return false;84     }85   } 86 } 87 88 ?>

六、总结

  至此整个实现网页截图并创建缩略图的的步骤结束,其中执行批处理文件部分为了提高截图效率采用手动的方式,批量打开批处理文件,另外,链接数据库部分还可以用封装的数据库操作类来实现,代码会更加简洁。

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