public static byte[] download(String urlString, String filename)			throws Exception {		byte[] bs = null;		InputStream is = null;		try {			// 鏋勯�燯RL			URL url = new URL(urlString);			// 鎵撳紑杩炴帴			URLConnection con = url.openConnection();						con.setConnectTimeout(1000);			con.setReadTimeout(1000);						// 杈撳叆娴�			is = con.getInputStream();						int i = con.getContentLength();			System.out.println("getContentLength : "+i);						bs = IOUtils.toByteArray(is);			System.out.println(	"toByteArray "+bs.length);						if (!StringUtils.isBlank(filename)) {				FileUtils.writeByteArrayToFile(new File(filename), bs);			}		} catch (Exception e) {			logger.error(e.getMessage(), e);		} finally {			if (is != null) {				is.close();			}		}