昨天（2013/08/12）在代码区看到一个生成站点快照的代码，看了半天才发现，作者仅仅贴出来业务代码，最核心的生成快照图片的代码反而没有给出来。 以前记得google搜索提供站点缩略图的现实，那时候觉得好神奇，但是没有花时间去做深入的调研。昨天又遇到了，那就顺便调研下吧。
才开始找到了wkhtmltopdf这款工具，这款工具的地址是：http://code.google.com/p/wkhtmltopdf/。 这款工具集下有一个wkhtmltoimage，可以用来生成站点快照。才开始在xen的虚拟机上跑，操作系统是centos，各种问题，折腾到最后实在没经历折腾了。
查到后来，看到老外一篇文章，发现wkhtmltoimage对与运行xen虚拟机的系统支持的并不好，具体情况可以参见这篇文章：http://blog.behance.net/dev/wkhtmltopdf-wkhtmltoimage-x-centos-x-xen-segfault-mania。
放弃了wkhtmltoimage，继续找到了phantomjs和slimerjs，两款都是服务器端的js，简单理解，都是封装了浏览器解析引擎，不同是phantomjs封装的webkti，slimerjs封装的是Gecko（firefox）。 权衡利弊，决定研究下phantomjs，于是就用phantomjs实现了网站快照生成。phantomjs的项目地址是：http://phantomjs.org/
代码涉及两个部分，一个是设计业务的index.php，另一个是生成快照的js脚本snapshot.js。代码比较简单，仅仅是实现了功能，没有做过多的修饰。代码分别如下所示：
index.php
<?php
if (isset($_GET['url']))
{
set_time_limit(0);
$url = trim($_GET['url']);
$filePath = "./cache/".md5($url).'.png';
if (is_file($filePath))
{
exit($filePath);
}
$command = "phantomjs/bin/phantomjs snapshot.js {$url} {$filePath}";
exec($command);
exit($filePath);
}
?>
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<meta name="keywords" content="" />
<meta name="description" content="" />
<title>快照生成</title>
<script src="http://code.jquery.com/jquery-1.8.3.min.js"></script>
<style>
* {
margin: 0;
padding: 0;
}
form {
padding: 20px;
}
div {
margin: 20px 0 0;
}
input {
width: 200px;
padding: 4px 2px;
}
#placeholder {
display: none;
}
</style>
</head>
<body>
<form action="" id="form">
<input type="text" id="url" />
<button type="submit">生成快照</button>
<div>
<img src="" alt="" id="placeholder" />
</div>
</form>
<script>
$(function(){
$('#form').submit(function(){
if (typeof($(this).data('generate')) !== 'undefined' && $(this).data('generate') === true)
{
alert('正在生成网站快照，请耐心等待...');
return false;
}
$(this).data('generate', true);
$('button').text('正在生成快照...').attr('disabled', true);
$.ajax({
type: 'GET',
url: '?',
data: 'url=' + $('#url').val(),
success: function(data){
$('#placeholder').attr('src', data).show();
$('#form').data('generate', false);
$('button').text('生成快照').attr('disabled', false);
}
});
return false;
});
});
</script>
</body>
</html>snapshot.js
var page = require('webpage').create();
var args = require('system').args;
var url = args[1];
var filename = args[2];
page.open(url, function () {
page.render(filename);
phantom.exit();
});
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