调用HTTP下载文件401错误

public static boolean httpDownload(String httpUrl, String saveFile) {
//		int bytesum = 0;
		int byteread = 0;

		URL url = null;
		try {
			url = new URL(httpUrl);
			java.net.Authenticator.setDefault(new java.net.Authenticator(){
				@Override
				protected PasswordAuthentication getPasswordAuthentication() {
					return new PasswordAuthentication("wcadmin", "wcadmin".toCharArray());
				}
			});
		} catch (MalformedURLException e1) {
			e1.printStackTrace();
			return false;
		}

		try {
			URLConnection conn = url.openConnection();
			InputStream inStream = conn.getInputStream();
			FileOutputStream fs = new FileOutputStream(saveFile);

			byte[] buffer = new byte[1204];
			while ((byteread = inStream.read(buffer)) != -1) {
//				bytesum += byteread;
//				System.out.println(bytesum);
				fs.write(buffer, 0, byteread);
			}
			return true;
		} catch (FileNotFoundException e) {
			e.printStackTrace();
			return false;
		} catch (IOException e) {
			e.printStackTrace();
			return false;
		}
	}