HTTP模拟下载文件

    private boolean export(String path, String saveName)
    {
        ServletOutputStream sos = null;
        FileInputStream in = null;
        try
        {
            String filename = URLDecoder.decode(path, "utf-8");
            if (null == filename || "".equals(filename))
            {
                return false;
            }
            else
            {
                sos = getResponse().getOutputStream();
                getResponse().reset();
                getResponse().setContentType("txt/html");
                getResponse().setHeader("Content-disposition",
                        "attachment;filename=" + saveName);
                byte b[] = new byte[Constants.KB];
                in = new FileInputStream(filename);
                int n = 0;
                while ((n = in.read(b)) != -1)
                {
                    sos.write(b, 0, n);
                }
                sos.flush();
            }
        }
        catch (FileNotFoundException e)
        {
            logger.debug("Download File failure.", e);
            return false;
        }
        catch (Exception e)
        {
            logger.debug("Download File failure.", e);
            return false;
        }
        finally
        {
            close(in);
            close(sos);
        }
       
        return true;
    }