jsp下载

 response.setContentType(fileminitype);
 response.setHeader("Location",filename);
 response.setHeader("Cache-Control", "max-age=" + cacheTime);
     //filename应该是编码后的(utf-8)
 response.setHeader("Content-Disposition", "attachment; filename=" + filename); 
 response.setContentLength(filelength);//下载文件的大小
 OutputStream outputStream = response.getOutputStream();
 InputStream inputStream = new FileInputStream(filepath);
 byte[] buffer = new byte[1024];
 int i = -1;
 while ((i = inputStream.read(buffer)) != -1) {
  outputStream.write(buffer, 0, i);
  }
 outputStream.flush();
 outputStream.close();
 inputStream.close();
 outputStream = null;