中文文件名下载乱码问题

<%@ page contentType="text/html;charset=utf-8" %>       
 
<%@ page import = "java.util.*" %>       
 
<%@ page import = "java.io.*" %>       
 
<%@ page import = "java.net.*" %>       
 
<%       
 
//防止IE缓存       
 
response.setHeader("pragma","no-cache");       
 
response.setHeader("cache-control","no-cache");       
 
response.setDateHeader("Expires",0);       
 
//设置编码       
 
request.setCharacterEncoding("UTF-8");       
 
      
 
String fileName = request.getParameter("fileName");       
 
//取到文件       
 
File file = new File(application.getRealPath("/")+"upload/" + fileName);       
 
response.reset();       
 
//response.setContentType("application/octet-stream;charset=UTF-8");    
 
response.setContentType("application/octet-stream;charset=GBK");//解决在弹出文件下载框不能打开文件的问题   
 
//System.out.println(response.getCharacterEncoding());       
 
//一定要对fileName进行encode       
 
//response.addHeader("Content-Disposition", "attachment; filename=" + java.net.URLEncoder.encode(fileName, "UTF-8"));    
 
response.addHeader("Content-Disposition", "attachment; filename=" + new String(fileName.getBytes("GBK"),"ISO8859-1"));//解决在弹出文件下载框不能打开文件的问题   
 
response.setContentLength((int) file.length());       
 
      
 
byte[] buffer = new byte[4096];       
 
BufferedOutputStream output = null;       
 
BufferedInputStream input = null;       
 
      
 
// 写缓冲区：       
 
try {       
 
    output = new BufferedOutputStream(response.getOutputStream());       
 
    input = new BufferedInputStream(new FileInputStream(file));       
 
      
 
    int n = (-1);       
 
    while ((n = input.read(buffer, 0, 4096)) > -1) {       
 
        output.write(buffer, 0, n);       
 
    }       
 
    response.flushBuffer();       
 
}       
 
catch (Exception e) {       
 
} // maybe user cancelled download       
 
finally {       
 
    if (input != null) input.close();       
 
    if (output != null) output.close();       
 
}       
 
%>