asp.net判斷瀏覽器版本代碼

來源:互聯網
上載者:User
string   UserBrowser=Request.Browser.Browser;//瀏覽器名稱

string   BrowserVersion=Request.Browser.Version;   //瀏覽器版本

 以下摘自MSDN

HttpBrowserCapabilities   bc   =   Request.Browser;
  Response.Write( " <p> Browser   Capabilities: </p> ");
  Response.Write( "Type   =   "   +   bc.Type   +   " <br> ");
  Response.Write( "Name   =   "   +   bc.Browser   +   " <br> ");
  Response.Write( "Version   =   "   +   bc.Version   +   " <br> ");
  Response.Write( "Major   Version   =   "   +   bc.MajorVersion   +   " <br> ");
  Response.Write( "Minor   Version   =   "   +   bc.MinorVersion   +   " <br> ");
  Response.Write( "Platform   =   "   +   bc.Platform   +   " <br> ");
  Response.Write( "Is   Beta   =   "   +   bc.Beta   +   " <br> ");
  Response.Write( "Is   Crawler   =   "   +   bc.Crawler   +   " <br> ");
  Response.Write( "Is   AOL   =   "   +   bc.AOL   +   " <br> ");
  Response.Write( "Is   Win16   =   "   +   bc.Win16   +   " <br> ");
  Response.Write( "Is   Win32   =   "   +   bc.Win32   +   " <br> ");
  Response.Write( "Supports   Frames   =   "   +   bc.Frames   +   " <br> ");
  Response.Write( "Supports   Tables   =   "   +   bc.Tables   +   " <br> ");
  Response.Write( "Supports   Cookies   =   "   +   bc.Cookies   +   " <br> ");
  Response.Write( "Supports   VB   Script   =   "   +   bc.VBScript   +   " <br> ");
  Response.Write( "Supports   JavaScript   =   "   +   bc.JavaScript   +   " <br> ");
  Response.Write( "Supports   Java   Applets   =   "   +   bc.JavaApplets   +   " <br> ");
  Response.Write( "Supports   ActiveX   Controls   =   "   +   bc.ActiveXControls   +   " <br> ");
  Response.Write( "CDF   =   "   +   bc.CDF   +   " <br> ");

 

如何在下載檔案名稱中使用UTF-8編碼

著作權聲明:可以任意轉載,但轉載時必須標明原作者charlee、原始連結http://tech.idv2.com/2009/03/05/use-utf8-in-download-filename/以及本聲明。

通過把Content-Type設定為application/octet-stream, 可以把動態產生的內容當作檔案來下載,相信這個大家都會。 那麼用Content-Disposition設定下載的檔案名稱, 這個也有不少人知道吧。 基本上,下載程式都是這麼寫的:

<?php
$filename = "document.txt";
header('Content-Type: application/octet-stream');
header('Content-Disposition: attachment; filename=' . $filename);

print "Hello!";
?>

這樣用瀏覽器開啟之後,就可以下載document.doc。

但是,如果$filename是UTF-8編碼的,有些瀏覽器就無法正常處理了。 比如把上面那個程式稍稍改一下:

<?php
$filename = "中文 檔案名稱.txt";
header('Content-Type: application/octet-stream');
header('Content-Disposition: attachment; filename=' . $filename);

print "Hello!";
?>

把程式儲存成UTF-8編碼再訪問,IE6下載的檔案名稱就會亂碼。 FF3下下載的檔案名稱就只有“中文”兩個字。Opera 9下一切正常。

輸出的header實際上是這樣子:

Content-Disposition: attachment; filename=中文 檔案名稱.txt

其實按照RFC2231的定義, 多語言編碼的Content-Disposition應該這麼定義:

Content-Disposition: attachment; filename*="utf8''%E4%B8%AD%E6%96%87%20%E6%96%87%E4%BB%B6%E5%90%8D.txt"

即:

  • filename後面的等號之前要加 *
  • filename的值用單引號分成三段,分別是字元集(utf8)、語言(空)和urlencode過的檔案名稱。
  • 最好加上雙引號,否則檔案名稱中空格後面的部分在Firefox中顯示不出來
  • 注意urlencode的結果與php的urlencode函數結果不太相同,php的urlencode會把空格替換成+,而這裡需要替換成%20

經過實驗,發現幾種主流瀏覽器的支援情況如下:

IE6 attachment; filename="<URL編碼之後的UTF-8檔案名稱>"
FF3 attachment; filename="UTF-8檔案名稱"
attachment; filename*="utf8''<URL編碼之後的UTF-8檔案名稱>"
O9 attachment; filename="UTF-8檔案名稱"
Safari3(Win) 貌似不支援?上述方法都不行

這樣看來,程式必須得這樣寫才能支援所有主流瀏覽器:

<?php

$ua = $_SERVER["HTTP_USER_AGENT"];

$filename = "中文 檔案名稱.txt";
$encoded_filename = urlencode($filename);
$encoded_filename = str_replace("+", "%20", $encoded_filename);

header('Content-Type: application/octet-stream');

if (preg_match("/MSIE/", $ua)) {
header('Content-Disposition: attachment; filename="' . $encoded_filename . '"');
} else if (preg_match("/Firefox/", $ua)) {
header('Content-Disposition: attachment; filename*="utf8\'\'' . $filename . '"');
} else {
header('Content-Disposition: attachment; filename="' . $filename . '"');
}

print 'ABC';
?>

 

 

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