response.setContentType()的String参数及对应类型
<option value="image/bmp">BMP</option> ?
<option value="image/gif">GIF</option> ?
<option value="image/jpeg">JPEG</option> ?
<option value="image/tiff">TIFF</option> ?
<option value="image/x-dcx">DCX</option> ?
<option value="image/x-pcx">PCX</option> ?
<option value="text/html">HTML</option> ?
<option value="text/plain">TXT</option> ?
<option value="text/xml">XML</option> ?
<option value="application/afp">AFP</option> ?
<option value="application/pdf">PDF</option> ?
<option value="application/rtf">RTF</option> ?
<option value="application/msword">MSWORD</option> ?
<option value="application/vnd.ms-excel">MSEXCEL</option> ?
<option value="application/vnd.ms-powerpoint">MSPOWERPOINT</option> ?
<option value="application/wordperfect5.1">WORDPERFECT</option> ?
<option value="application/vnd.lotus-wordpro">WORDPRO</option> ?
<option value="application/vnd.visio">VISIO</option> ?
<option value="application/vnd.framemaker">FRAMEMAKER</option> ?
<option value="application/vnd.lotus-1-2-3">LOTUS123</option><!--EndFragment-->
