可以对http最终输出内容做任意的替换,代码如下:
using System;
using System.Collections;
using System.Configuration;
using System.Text.RegularExpressions;
using System.Web;
using System.Xml;
using System.Xml.Serialization;
using System.IO;
using System.Text;
namespace Cnlamar.Web.HttpModule
{
public class TextReplace : IHttpModule
{
public virtual void Dispose()
{
}
public virtual void Init(HttpApplication context)
{
context.ReleaseRequestState += new EventHandler(this.context_ReleaseRequestState);
}
public void context_ReleaseRequestState(object sender, EventArgs e)
{
HttpApplication httpApplication = (HttpApplication)sender;
if (httpApplication.Response.ContentType.ToLower().IndexOf("image") <= -1)
{
TextReplaceFilter textReplaceFilter = new TextReplaceFilter(httpApplication.Response.Filter);
textReplaceFilter.Encoding = System.Text.Encoding.GetEncoding(httpApplication.Response.ContentEncoding.BodyName);
textReplaceFilter.ReplaceRules = TextReplaceConfiguration.GetConfig().Rules;
httpApplication.Response.Filter = textReplaceFilter;
}
}
}
class TextReplaceFilter : Stream
{
public bool IsRestore = false;
private Stream m_stream;
private long m_position;
private TextReplaceRulesCollection _ReplaceRules;
public TextReplaceRulesCollection ReplaceRules
{
get
{
return _ReplaceRules;
}
set
{
_ReplaceRules = value;
}
}
public Encoding Encoding
{
get
{
return _Encoding;
}
set
{
_Encoding = value;
}
}
private Encoding _Encoding = Encoding.UTF8;
public override bool CanRead
{
get
{
return true;
}
}
public override bool CanSeek
{
get
{
return false;
}
}
public override bool CanWrite
{
get
{
return false;
}
}
public override long Length
{
get
{
return 0;
}
}
public override long Position
{
get
{
return m_position;
}
set
{
m_position = value;
}
}
public TextReplaceFilter(Stream InputStream)
{
m_stream = InputStream;
}
public override long Seek(long offset, SeekOrigin direction)
{
return 0;
}
public override void SetLength(long length)
{
m_stream.SetLength(length);
}
public override void Close()
{
m_stream.Close();
}
public override void Flush()
{
m_stream.Flush();
}
public override int Read(byte[] buffer, int offset, int count)
{
return m_stream.Read(buffer, offset, count);
}
public override void Write(byte[] buffer, int offset, int count)
{
string str = Encoding.GetString(buffer, offset, count);
IEnumerator iEnumerator = ReplaceRules.GetEnumerator();
try
{
while (iEnumerator.MoveNext())
{
TextReplaceRules textReplaceRules = (TextReplaceRules)iEnumerator.Current;
str = str.Replace(textReplaceRules.OriginText, textReplaceRules.ResultText);
}
}
finally
{
IDisposable iDisposable = iEnumerator as IDisposable;
if (iDisposable != null)
{
iDisposable.Dispose();
}
}
byte[] bs = Encoding.GetBytes(str);
m_stream.Write(bs, offset, (int)bs.Length);
}
}
#region Config
public class TextReplaceRules
{
private string _OriginText;
private string _ResultText;
public string OriginText
{
get
{
return _OriginText;
}
set
{
_OriginText = value;
}
}
public string ResultText
{
get
{
return _ResultText;
}
set
{
_ResultText = value;
}
}
}
[SerializableAttribute()]
public class TextReplaceRulesCollection : CollectionBase
{
public TextReplaceRules this[int index]
{
get
{
return (TextReplaceRules)base.InnerList[index];
}
set
{
base.InnerList[index] = value;
}
}
public virtual void Add(TextReplaceRules r)
{
base.InnerList.Add(r);
}
}
[XmlRootAttribute("TextReplaceConfig")]
[SerializableAttribute()]
public class TextReplaceConfiguration
{
private TextReplaceRulesCollection rules;
public TextReplaceRulesCollection Rules
{
get
{
return rules;
}
set
{
rules = value;
}
}
public static TextReplaceConfiguration GetConfig()
{
if (HttpContext.Current.Cache["TextReplaceConfig"] == null)
{
TextReplaceConfiguration textReplaceConfiguration1 = (TextReplaceConfiguration)ConfigurationSettings.GetConfig("TextReplaceConfig");
HttpContext.Current.Cache.Insert("TextReplaceConfig", ConfigurationSettings.GetConfig("TextReplaceConfig"));
}
TextReplaceConfiguration textReplaceConfiguration2 = (TextReplaceConfiguration)HttpContext.Current.Cache["TextReplaceConfig"];
return textReplaceConfiguration2;
}
}
public class TextReplaceSerializerSectionHandler : IConfigurationSectionHandler
{
public virtual object Create(object parent, object configContext, XmlNode section)
{
return new XmlSerializer(typeof(TextReplaceConfiguration)).Deserialize(new XmlNodeReader(section));
}
}
#endregion
}
转载于:https://www.cnblogs.com/webman/archive/2007/07/04/806292.html
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