图片防盗链

Posted on 2007-12-25 09:16 yuanws 阅读(41) 评论(0) 编辑收藏

自定义一个继承自httphandle的类

Code
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using System;
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using System.Web;
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using System.IO;
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namespace WebTj.Jhttphandle
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{
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/// <summary>
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/// Httphandles 的摘要说明。
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/// </summary>
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public class Httphandles:IHttpHandler
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{
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public Httphandles()
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{
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//
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// TODO: 在此处添加构造函数逻辑
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//
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}
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public void ProcessRequest(System.Web.HttpContext context)
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{
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FileInfo file = new System.IO.FileInfo(context.Request.PhysicalPath);
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if(context.Request.UrlReferrer !=null && context.Request.UrlReferrer.Host == "200.1.2.84")//判断是否是本地引用，如果是则返回给客户端正确的图片，这里的判断就是用到了前面所述的http请求中所记路的参考页信息
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{
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context.Response.Expires = 0;//设置客户端缓冲中文件过期时间为0，即立即过期。
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context.Response.Clear();//清空服务器端为此会话开辟的输出缓存
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context.Response.ContentType =GetContentType(context.Request.PhysicalPath); //获得文件类型
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context.Response.WriteFile(context.Request.PhysicalPath);//将请求文件写入到服务器端为此会话开辟的输出缓存中
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context.Response.End();//将服务器端为此会话开辟的输出缓存中的信息传送到客户端
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}
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else //如果不是本地引用，则属于盗链引用，返回给客户端错误的图片
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{
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context.Response.Expires = 0; //设置客户端缓冲中文件过期时间为0，即立即过期。
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context.Response.Clear();//清空服务器端为此会话开辟的输出缓存
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context.Response.ContentType = GetContentType("/Images/loading.gif"); //获得文件类型
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context.Response.WriteFile("/Images/loading.gif");//将特殊的报告错误的图片文件写入到服务器端为此会话开辟的输出缓存中
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context.Response.End();//将服务器端为此会话开辟的输出缓存中的信息传送到客户端
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}
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}
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public bool IsReusable
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{
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get
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{
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return true;
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}
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}
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protected static string GetContentType(string strFileName)
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{
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string strExtendName = strFileName.Substring(strFileName.LastIndexOf('.'));
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if (strExtendName=="")
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{
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return "";
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}
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string strRet = "";
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switch (strExtendName)
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{
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case ".*": strRet = "application/octet-stream";break;
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case ".001": strRet = "application/x-001";break;
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case ".301": strRet = "application/x-301";break;
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case ".323": strRet = "text/h323" ;break;
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case ".906": strRet = "application/x-906" ;break;
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case ".907": strRet = "drawing/907" ;break;
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case ".a11": strRet = "application/x-a11";break;
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case ".acp": strRet = "audio/x-mei-aac" ;break;
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case ".ai": strRet = "application/postscript" ;break;
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case ".aif": strRet = "audio/aiff" ;break;
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case ".aifc": strRet = "audio/aiff" ;break;
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case ".aiff": strRet = "audio/aiff" ;break;
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case ".anv": strRet = "application/x-anv" ;break;
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case ".asa": strRet = "text/asa";break;
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case ".asf": strRet = "video/x-ms-asf";break;
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case ".asp": strRet = "text/asp";break;
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case ".asx": strRet = "video/x-ms-asf";break;
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case ".au": strRet = "audio/basic";break;
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case ".avi": strRet = "video/avi";break;
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case ".awf": strRet = "application/vnd.adobe.workflow";break;
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case ".biz": strRet = "text/xml";break;
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case ".bmp": strRet = "application/x-bmp";break;
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case ".bot": strRet = "application/x-bot";break;
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case ".c4t": strRet = "application/x-c4t";break;
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case ".c90": strRet = "application/x-c90";break;
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case ".cal": strRet = "application/x-cals";break;
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case ".cat": strRet = "application/vnd.ms-pki.seccat";break;
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case ".cdf": strRet = "application/x-netcdf";break;
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case ".cdr": strRet = "application/x-cdr";break;
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case ".cel": strRet = "application/x-cel";break;
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case ".cer": strRet = "application/x-x509-ca-cert";break;
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case ".cg4": strRet = "application/x-g4";break;
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case ".cgm": strRet = "application/x-cgm";break;
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case ".cit": strRet = "application/x-cit";break;
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case ".class": strRet = "java/*";break;
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case ".cml": strRet = "text/xml";break;
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case ".cmp": strRet = "application/x-cmp";break;
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case ".cmx": strRet = "application/x-cmx";break;
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case ".cot": strRet = "application/x-cot";break;
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case ".crl": strRet = "application/pkix-crl";break;
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case ".crt": strRet = "application/x-x509-ca-cert";break;
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case ".csi": strRet = "application/x-csi";break;
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case ".css": strRet = "text/css";break;
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case ".cut": strRet = "application/x-cut";break;
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case ".dbf": strRet = "application/x-dbf";break;
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case ".dbm": strRet = "application/x-dbm";break;
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case ".dbx": strRet = "application/x-dbx";break;
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case ".dcd": strRet = "text/xml";break;
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case ".dcx": strRet = "application/x-dcx";break;
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case ".der": strRet = "application/x-x509-ca-cert";break;
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case ".dgn": strRet = "application/x-dgn";break;
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case ".dib": strRet = "application/x-dib";break;
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case ".dll": strRet = "application/x-msdownload";break;
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case ".doc": strRet = "application/msword";break;
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case ".dot": strRet = "application/msword";break;
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case ".drw": strRet = "application/x-drw";break;
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case ".dtd": strRet = "text/xml";break;
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//case ".dwf": strRet = "Model/vnd.dwf";break;
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case ".dwf": strRet = "application/x-dwf";break;
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case ".dwg": strRet = "application/x-dwg";break;
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case ".dxb": strRet = "application/x-dxb";break;
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case ".dxf": strRet = "application/x-dxf";break;
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case ".edn": strRet = "application/vnd.adobe.edn";break;
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case ".emf": strRet = "application/x-emf";break;
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case ".eml": strRet = "message/rfc822";break;
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case ".ent": strRet = "text/xml";break;
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case ".epi": strRet = "application/x-epi";break;
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case ".eps": strRet = "application/x-ps";break;
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//case ".eps": strRet = "application/postscript";break;
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case ".etd": strRet = "application/x-ebx";break;
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case ".exe": strRet = "application/x-msdownload";break;
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case ".fax": strRet = "image/fax";break;
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case ".fdf": strRet = "application/vnd.fdf";break;
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case ".fif": strRet = "application/fractals";break;
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case ".fo": strRet = "text/xml";break;
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case ".frm": strRet = "application/x-frm";break;
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case ".g4": strRet = "application/x-g4";break;
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case ".gbr": strRet = "application/x-gbr";break;
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case ".gcd": strRet = "application/x-gcd";break;
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case ".gif": strRet = "image/gif";break;
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case ".gl2": strRet = "application/x-gl2";break;
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case ".gp4": strRet = "application/x-gp4";break;
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case ".hgl": strRet = "application/x-hgl";break;
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case ".hmr": strRet = "application/x-hmr";break;
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case ".hpg": strRet = "application/x-hpgl";break;
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case ".hpl": strRet = "application/x-hpl";break;
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case ".hqx": strRet = "application/mac-binhex40";break;
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case ".hrf": strRet = "application/x-hrf";break;
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case ".hta": strRet = "application/hta";break;
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case ".htc": strRet = "text/x-component";break;
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case ".htm": strRet = "text/html";break;
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case ".html": strRet = "text/html";break;
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case ".htt": strRet = "text/webviewhtml";break;
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case ".htx": strRet = "text/html";break;
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case ".icb": strRet = "application/x-icb";break;
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case ".ico": strRet = "image/x-icon";break;
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//case ".ico": strRet = "application/x-ico";break;
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case ".iff": strRet = "application/x-iff";break;
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case ".ig4": strRet = "application/x-g4";break;
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case ".igs": strRet = "application/x-igs";break;
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case ".iii": strRet = "application/x-iphone";break;
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case ".img": strRet = "application/x-img";break;
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case ".ins": strRet = "application/x-internet-signup";break;
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case ".isp": strRet = "application/x-internet-signup";break;
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case ".IVF": strRet = "video/x-ivf";break;
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case ".java": strRet = "java/*";break;
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case ".jfif": strRet = "image/jpeg";break;
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case ".jpe": strRet = "image/jpeg";break;
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//case ".jpe": strRet = "application/x-jpe";break;
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case ".jpeg": strRet =