java下载文件

 /**
      *
      * @param file
      * @param response
      */
     private void downLoad(File file, HttpServletResponse response,
             String browser) throws IOException {
         InputStream is = new FileInputStream(file);
         try {

             String fileName = file.getName().replaceAll(" ", "");
             OutputStream os = response.getOutputStream();
             BufferedInputStream bis = new BufferedInputStream(is);
             BufferedOutputStream bos = new BufferedOutputStream(os);

             if (browser.indexOf("msie") != -1) {
                 fileName = java.net.URLEncoder.encode(fileName, "UTF-8");
                 fileName = new String(fileName.getBytes("UTF-8"), "GBK");
             } else if (browser.indexOf("Firefox") != -1) {
                 fileName = java.net.URLEncoder.encode(fileName, "UTF-8");
                 fileName = new String(fileName.getBytes("UTF-8"), "ISO8859-1");
             } else if (browser.indexOf("Safari") != -1) {
                 fileName = new String(fileName.getBytes(), "ISO8859-1");
             }

             response.reset();
             response.setCharacterEncoding("UTF-8");
             response.setContentType("application/x-msdownload");
             response.setHeader("Content-Disposition", "attachment; filename="
                     + fileName);
             int bytesRead = 0;
             byte[] buffer = new byte[1024];
             while ((bytesRead = bis.read(buffer)) != -1) {
                 bos.write(buffer, 0, bytesRead);
             }

             bos.flush();
             bis.close();
             bos.close();

             is.close();

             os.close();

         } catch (Exception ex) {

             log.info("");

         } finally {
             is.close();
         }
     }