怎么让链接不是直接播放而是下载？

package com.dw;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;public class DownloadsServlet extends HttpServlet { private static final long serialVersionUID = -6664176293056839762L; public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
// ////////////////////////rlq
String filename = request.getParameter("file");
if (filename != null) {
String filename2 = new String(request.getParameter("file")
.getBytes("GBK"), "ISO_8859_1");
// bhString bhstr = new bhString(); //我自己定义的类
// filename2 =
// bhstr.getFileName(filename2);//用来获取文件名,比如提交的是upload/test.jpg,取得test.jpg
String rootpath = getServletContext().getRealPath("/");
String filepath = rootpath + filename;
response.setContentType("application/octet-stream;charset=GBK");
response.setHeader("Content-disposition", "attachment;filename=\""
+ filename2 + "\"");
// //////////////////////////
// //String s =
// "I:\\SetupRes\\Sun\\j2re-1_4_2_05-windows-i586-p.exe";
// String s = "e:\\tree.mdb"; // 经测试 RandomAccessFile 也可以实现,有兴趣可将注释去掉,并注释掉 FileInputStream 版本的语句
// java.io.RandomAccessFile raf = new
// java.io.RandomAccessFile(s,"r");
try{
java.io.File f = new java.io.File(filepath);
java.io.FileInputStream fis = new java.io.FileInputStream(f);

response.reset(); //del by rlq// response.setHeader("Server", "[email protected]"); // 告诉客户端允许断点续传多线程连接下载
// 响应的格式是:
// Accept-Ranges: bytes
response.setHeader("Accept-Ranges", "bytes"); long p = 0;
long l = 0;
// l = raf.length();
l = f.length(); // 如果是第一次下,还没有断点续传,状态是默认的 200,无需显式设置
// 响应的格式是:
// HTTP/1.1 200 OK if (request.getHeader("Range") != null) // 客户端请求的下载的文件块的开始字节
{
// 如果是下载文件的范围而不是全部,向客户端声明支持并开始文件块下载
// 要设置状态
// 响应的格式是:
// HTTP/1.1 206 Partial Content
response
.setStatus(javax.servlet.http.HttpServletResponse.SC_PARTIAL_CONTENT);// 206 // 从请求中得到开始的字节
// 请求的格式是:
// Range: bytes=[文件块的开始字节]-
p = Long.parseLong(request.getHeader("Range").replaceAll(
"bytes=", "").replaceAll("-", ""));
} // 下载的文件(或块)长度
// 响应的格式是:
// Content-Length: [文件的总大小] - [客户端请求的下载的文件块的开始字节]
response.setHeader("Content-Length", new Long(l - p).toString()); if (p != 0) {
// 不是从最开始下载,
// 响应的格式是:
// Content-Range: bytes [文件块的开始字节]-[文件的总大小 - 1]/[文件的总大小]
response.setHeader("Content-Range", "bytes "
+ new Long(p).toString() + "-"
+ new Long(l - 1).toString() + "/"
+ new Long(l).toString());
} // response.setHeader("Connection", "Close"); //如果有此句话不能用 IE 直接下载 // 使客户端直接下载
// 响应的格式是:
// Content-Type: application/octet-stream
response.setContentType("application/octet-stream"); // 为客户端下载指定默认的下载文件名称
// 响应的格式是:
// Content-Disposition: attachment;filename="[文件名]"
// response.setHeader("Content-Disposition",
// "attachment;filename=\"" + s.substring(s.lastIndexOf("\\") + 1) +
// "\""); //经测试 RandomAccessFile 也可以实现,有兴趣可将注释去掉,并注释掉
// FileInputStream 版本的语句
response.setHeader("Content-Disposition", "attachment;filename=\""
+ f.getName() + "\""); // raf.seek(p);
fis.skip(p); byte[] b = new byte[1024];
int i; // while ( (i = raf.read(b)) != -1 ) //经测试 RandomAccessFile
// 也可以实现,有兴趣可将注释去掉,并注释掉 FileInputStream 版本的语句
while ((i = fis.read(b)) != -1) {
response.getOutputStream().write(b, 0, i);
}
// raf.close();//经测试 RandomAccessFile 也可以实现,有兴趣可将注释去掉,并注释掉
// FileInputStream 版本的语句
fis.close();
}catch(Exception e){
e.printStackTrace();

}
} else {
PrintWriter out = response.getWriter();
out.println("<html>");
out.println("<head>");
out
.println("<link rel=\"stylesheet\" type=\"text/css\" href=\"styles.css\">");
out.println("</head>");
out.println("<body>");
out.println("出错啦！！！");
out.println("</body>");
out.println("</html>");
} } public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException { doGet(request, response); }}
//这是一个下载的servlet,向其传入文件名“file”即可实现任何格式文件的下载
//来源于网络
$mimetypes = array(
    'ez'        => 'application/andrew-inset',
    'hqx'        => 'application/mac-binhex40',
    'cpt'        => 'application/mac-compactpro',
    'doc'        => 'application/msword',
    'bin'        => 'application/octet-stream',
    'dms'        => 'application/octet-stream',
    'lha'        => 'application/octet-stream',
    'lzh'        => 'application/octet-stream',
    'exe'        => 'application/octet-stream',
    'class'        => 'application/octet-stream',
    'so'        => 'application/octet-stream',
    'dll'        => 'application/octet-stream',
    'oda'        => 'application/oda',
    'pdf'        => 'application/pdf',
    'ai'        => 'application/postscript',
    'eps'        => 'application/postscript',
    'ps'        => 'application/postscript',
    'smi'        => 'application/smil',
    'smil'        => 'application/smil',
    'mif'        => 'application/vnd.mif',
    'xls'        => 'application/vnd.ms-excel',
    'ppt'        => 'application/vnd.ms-powerpoint',
    'wbxml'        => 'application/vnd.wap.wbxml',
    'wmlc'        => 'application/vnd.wap.wmlc',
    'wmlsc'        => 'application/vnd.wap.wmlscriptc',
    'bcpio'        => 'application/x-bcpio',
    'vcd'        => 'application/x-cdlink',
    'pgn'        => 'application/x-chess-pgn',
    'cpio'        => 'application/x-cpio',
    'csh'        => 'application/x-csh',
    'dcr'        => 'application/x-director',
    'dir'        => 'application/x-director',
    'dxr'        => 'application/x-director',
    'dvi'        => 'application/x-dvi',
    'spl'        => 'application/x-futuresplash',
    'gtar'        => 'application/x-gtar',
    'hdf'        => 'application/x-hdf',
    'js'        => 'application/x-javascript',
    'skp'        => 'application/x-koan',
    'skd'        => 'application/x-koan',
    'skt'        => 'application/x-koan',
    'skm'        => 'application/x-koan',
    'latex'        => 'application/x-latex',
    'nc'        => 'application/x-netcdf',
    'cdf'        => 'application/x-netcdf',
    'sh'        => 'application/x-sh',
    'shar'        => 'application/x-shar',
    'swf'        => 'application/x-shockwave-flash',
    'sit'        => 'application/x-stuffit',
    'sv4cpio'    => 'application/x-sv4cpio',
    'sv4crc'    => 'application/x-sv4crc',
    'tar'        => 'application/x-tar',
    'tcl'        => 'application/x-tcl',
    'tex'        => 'application/x-tex',
    'texinfo'    => 'application/x-texinfo',
    'texi'        => 'application/x-texinfo',
    't'            => 'application/x-troff',
    'tr'        => 'application/x-troff',
    'roff'        => 'application/x-troff',
    'man'        => 'application/x-troff-man',
    'me'        => 'application/x-troff-me',
    'ms'        => 'application/x-troff-ms',
    'ustar'        => 'application/x-ustar',
    'src'        => 'application/x-wais-source',
    'xhtml'        => 'application/xhtml+xml',
    'xht'        => 'application/xhtml+xml',
    'zip'        => 'application/zip',
    'au'        => 'audio/basic',
    'snd'        => 'audio/basic',
    'mid'        => 'audio/midi',
    'midi'        => 'audio/midi',
    'kar'        => 'audio/midi',
    'mpga'        => 'audio/mpeg',
    'mp2'        => 'audio/mpeg',
    'mp3'        => 'audio/mpeg',
    'aif'        => 'audio/x-aiff',
    'aiff'        => 'audio/x-aiff',
    'aifc'        => 'audio/x-aiff',
    'm3u'        => 'audio/x-mpegurl',
    'ram'        => 'audio/x-pn-realaudio',
    'rm'        => 'audio/x-pn-realaudio',
    'rpm'        => 'audio/x-pn-realaudio-plugin',
    'ra'        => 'audio/x-realaudio',
    'wav'        => 'audio/x-wav',
    'pdb'        => 'chemical/x-pdb',
    'xyz'        => 'chemical/x-xyz',
    'bmp'        => 'image/bmp',
    'gif'        => 'image/gif',
    'ief'        => 'image/ief',
    'jpeg'        => 'image/jpeg',
    'jpg'        => 'image/jpeg',
    'jpe'        => 'image/jpeg',
    'png'        => 'image/png',
    'tiff'        => 'image/tiff',
    'tif'        => 'image/tiff',
    'djvu'        => 'image/vnd.djvu',
    'djv'        => 'image/vnd.djvu',
    'wbmp'        => 'image/vnd.wap.wbmp',
    'ras'        => 'image/x-cmu-raster',
    'pnm'        => 'image/x-portable-anymap',
    'pbm'        => 'image/x-portable-bitmap',
    'pgm'        => 'image/x-portable-graymap',
    'ppm'        => 'image/x-portable-pixmap',
    'rgb'        => 'image/x-rgb',
    'xbm'        => 'image/x-xbitmap',
    'xpm'        => 'image/x-xpixmap',
    'xwd'        => 'image/x-xwindowdump',
    'igs'        => 'model/iges',
    'iges'        => 'model/iges',
    'msh'        => 'model/mesh',
    'mesh'        => 'model/mesh',
    'silo'        => 'model/mesh',
    'wrl'        => 'model/vrml',
    'vrml'        => 'model/vrml',
    'css'        => 'text/css',
    'html'        => 'text/html',
    'htm'        => 'text/html',
    'asc'        => 'text/plain',
    'txt'        => 'text/plain',
    'rtx'        => 'text/richtext',
    'rtf'        => 'text/rtf',
    'sgml'        => 'text/sgml',
    'sgm'        => 'text/sgml',
    'tsv'        => 'text/tab-separated-values',
    'wml'        => 'text/vnd.wap.wml',
    'wmls'        => 'text/vnd.wap.wmlscript',
    'etx'        => 'text/x-setext',
    'xsl'        => 'text/xml',
    'xml'        => 'text/xml',
    'mpeg'        => 'video/mpeg',
    'mpg'        => 'video/mpeg',
    'mpe'        => 'video/mpeg',
    'qt'        => 'video/quicktime',
    'mov'        => 'video/quicktime',
    'mxu'        => 'video/vnd.mpegurl',
    'avi'        => 'video/x-msvideo',
    'movie'        => 'video/x-sgi-movie',
    'ice'        => 'x-conference/x-cooltalk',
);

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怎么让链接不是直接播放而是下载？

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