在Godday虚拟主机上面配置BlogEngine.NET虚拟目录的处理方法

原文地址：http://hongzhang.me/post/2011/06/11/godaddy-blogengine-virtualpath.aspx

Godaddy的虚拟主机支持多个域名，但是我再配置BlogEngine.NET的时候，发现生成的URL包含虚拟目录，如：http://mydomain/blog/...... 红色的blog就是我再主机上面建立的子目录，用于存放BlogEngine.NET的目录。如何不让blog显示在生成的URL中呢？

如果修改源代码，那么以后的升级会很麻烦。所以解决方法必须要做到可配置，对源代码修改最小化。我的思路是添加一个HttpModule，在 HttpModule中将所有的a标签里面包含虚拟目录名称的替换成空字符串。这样对源代码的修改只是在web.config里面多注册一个 HttpModule。

方法确定了，有个关键问题需要解决：如何在HttpModule中修改Http输出内容？方法就是使用HttpApplication.Response.Filter，自定义一个Filter，在Filter里面实现URL的分析和处理。

关键代码：

1.定义HttpModule

public class VitualPathHttpModule:IHttpModule
    {
        public void Dispose()
        {

        }

        public void Init(HttpApplication context)
        {
            context.ReleaseRequestState += new EventHandler(context_ReleaseRequestState);
        }

        void context_ReleaseRequestState(object sender, EventArgs e)
        {
            HttpApplication application = (HttpApplication)sender;

            //装配过滤器
            application.Response.Filter = new VirtualPathFilter(application.Response.Filter, application);

        }
    }

2.定义自定义Filter：VirtualPathFilter

public class VirtualPathFilter : Stream
    {
        Stream responseStream;
        long position;
        HttpApplication context;

        private VirtualPathFilter()
        {
        }

        public VirtualPathFilter(Stream inputStream,HttpApplication inputContext)
        {
            responseStream = inputStream;
            context = inputContext;
        }

        #region Write

        public override void Write(byte[] buffer, int offset, int count)
        {
            string strContent = UTF8Encoding.UTF8.GetString(buffer);


            string vitualPath = VirtualPathUtility.ToAbsolute(ConfigurationManager.AppSettings["BlogEngine.VirtualPath"]);
            if (!string.IsNullOrEmpty(vitualPath))
            {
                var vitualPath1 = vitualPath.TrimStart('/');
                var vitualPath2 = vitualPath.TrimEnd('/');
                var vitualPath3 = vitualPath.Trim('/');

                string pattern = "<a[^<>]+href=\"[^>\"]*"+ vitualPath3 +"[^>\"]*\"";
                Regex reg = new Regex(pattern, RegexOptions.IgnoreCase);
                var ms = reg.Matches(strContent);
                List<string> values = new List<string>();
                foreach (Match item in ms)
                {
                    var value = item.Value;
                    if (values.Contains(value))
                    {
                        continue;
                    }
                    values.Add(value);
                    if (value.IndexOf(vitualPath) > -1)
                    {
                        value = value.Replace(vitualPath, "/");
                    }
                    if (value.IndexOf(vitualPath1) > -1)
                    {
                        // othersite/blog/#NET -> #NET
                        value = value.Replace(vitualPath1, "");
                    }

                    if (value.IndexOf(vitualPath2) > -1)
                    {
                        // /othersite/blog -> /
                        value = value.Replace(vitualPath2, "/");
                    }

                    if (value.IndexOf(vitualPath3) > -1)
                    {
                        value = value.Replace(vitualPath3, "");
                    }
                    strContent = strContent.Replace(item.Value, value);
                }

            }

            responseStream.Write(UTF8Encoding.UTF8.GetBytes(strContent), offset, UTF8Encoding.UTF8.GetByteCount(strContent));

        }
        #endregion


        #region Filter Overrides

        public override bool CanRead
        {
            get
            {
                return true;
            }
        }

        public override bool CanSeek
        {
            get
            {
                return true;
            }
        }

        public override bool CanWrite
        {
            get
            {
                return true;
            }
        }
        public override void Close()
        {
            responseStream.Close();
        }

        public override void Flush()
        {
            responseStream.Flush();
        }

        public override long Length
        {
            get
            {
                return 0;
            }
        }

        public override long Position
        {
            get
            {
                return position;
            }
            set
            {
                position = value;
            }
        }

        public override int Read(byte[] buffer, int offset, int count)
        {
            return responseStream.Read(buffer, offset, count);
        }

        public override long Seek(long offset, SeekOrigin origin)
        {
            return responseStream.Seek(offset, origin);
        }

        public override void SetLength(long length)
        {
            responseStream.SetLength(length);
        }
        #endregion



    }

3.在Web.config中注册HttpModule

至此，BlogEngine.NET生成的URL里面就不包含虚拟目录了，大功告成。

posted on 2011-06-18 21:13 试翼阁阅读(365) 评论(0) 收藏举报

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