類似于：百度文庫下載工具的原理與實現

我們分析“豆丁文檔免登陸免積分下載工具原理”，這里的實驗文檔網址是：http://www.docin.com/p-239490008.html，和上回說的是一個文檔，不過一個是在百度一個是在豆丁。

首先下載http://www.docin.com/p-239490008.html，找到網頁內容：

<script language="javascript" type="text/javascript">

var playcontent = {"converSuccess":[30],"downloadPrice":[9.38],"autherId":[29814826],"pdtType":["pdf"],"onlinePrice":[0],"bookMarkId":[0],"initLoadCtrl":[true],"pdtState":[0],"pageNum":[1],"autherNickName":["yy_js92"],"sharetime":["2011-08-03 14:27:15"],"pdtTitle":["側方位停車圖解教你側方停車技巧"],"pdtSize":[""],"pdtFreeDown":[false],"bookMark":[0],"errorCode":[0],"pdtDescription":["側方位停車圖解教你側方停車技巧"],"onlinePage":[0],"auditLevel":[1],"pcatid":["5"]};
function returnJson(){
return playcontent;
}

var fo = new SWFObject("http://pics.wanlibo.com/players/DocinViewer.swf?rand=20110819", "player", "100%", "100%", "9.0.16.0");
fo.addVariable("productId",239490008);
fo.addVariable("channel",0);
fo.addVariable("loadurl" , "file1.yimk.com");
fo.addVariable("aid" , 499);
fo.addParam("align","middle");
fo.addParam("wmode","transparent");
fo.addParam("quality","high");
fo.addParam("allowScriptAccess","always");
fo.addParam("allowFullScreen","true");
fo.addParam("wmode","transparent");

fo.useExpressInstall('http://pics.wanlibo.com/players/expressinstall.swf');
fo.write("DocinViewer");
</script>

其中playcontent中是文檔的具體信息，找到file1.yimk.com，那么構造網址：

http://file1.yimk.com/docin_239490008.docin然后下載得到一個swf文件，這個文件是加密過的。

解析……

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轉載于:https://www.cnblogs.com/daxingxing/archive/2011/08/26/2154778.html

總結

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