asp.net 使用Response.Filter 過濾非法詞匯
2024-07-10 12:42:34
供稿：網(wǎng)友
另一種解決方案是在輸出時(shí)過濾掉非常詞匯，優(yōu)點(diǎn)是只要寫一次就好了，可以過濾整站的非法詞匯，缺點(diǎn)是，非法詞匯仍然存入到了數(shù)據(jù)庫中，呵呵，大家可以有針對性的選擇，本例用的是后者，起因在于當(dāng)初沒有做此功能，后來需要添加，這時(shí)又不想改原來代碼，所以就想了這個(gè)辦法，主要是采用了HttpResponse.Filter屬性來處理。具體代碼如下：
首先自定義一個(gè)類，來作為非法詞匯的過濾器
代碼如下:
public class ResponseFilter:Stream
{
#region properties
Stream responseStream;
long position;
StringBuilder html = new StringBuilder();
#endregion
#region constructor
public ResponseFilter(Stream inputStream)
{
responseStream = inputStream;
}
#endregion
#region implemented abstract members
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 long Seek(long offset, System.IO.SeekOrigin direction)
{
return responseStream.Seek(offset, direction);
}
public override void SetLength(long length)
{
responseStream.SetLength(length);
}
public override int Read(byte[] buffer, int offset, int count)
{
return responseStream.Read(buffer, offset, count);
}
#endregion
#region write method
public override void Write(byte[] buffer, int offset, int count)
{
string sBuffer = System.Text.UTF8Encoding.UTF8.GetString(buffer, offset, count);
//得到非法詞匯列表，這個(gè)可以在數(shù)據(jù)庫或Web.Config中讀取出來
string pattern = @"(非法詞匯1|非法詞匯2|非法詞匯3)";
string[] s = pattern.Split(new string[] { "|" }, StringSplitOptions.RemoveEmptyEntries);
foreach (string s1 in s)
{
sBuffer = sBuffer.Replace(s1, "**");
}
byte[] data = System.Text.UTF8Encoding.UTF8.GetBytes(sBuffer);
responseStream.Write(data, 0, data.Length);
}
#endregion
}
然后再Global.asax文件中，添加如下代碼：
[code]
public void Application_BeginRequest(){
Response.Filter = new ResponseFilter(Response.Filter);
}
OK,測試一下吧！
