java http connection download file

1
2private void download(){
3  URL url = new URL("https://www.vogella.com/");
4  HttpURLConnection con = (HttpURLConnection) url.openConnection();
5  String readStream = readStream(con.getInputStream());
6}
7private static String readStream(InputStream in) {
8   StringBuilder sb = new StringBuilder();
9    try (BufferedReader reader = new BufferedReader(new InputStreamReader(in));) {
10    	String nextLine = "";
11        while ((nextLine = reader.readLine()) != null) {
12        	sb.append(nextLine + newLine);
13        }
14     } catch (IOException e) {
15       	e.printStackTrace();
16     }
17    return sb.toString();
18    
19}
20