java利用url写个抓取服务器文件

try {
URL url = new URL("https://www.baidu.com/");
URLConnection  urlc =url.openConnection();
BufferedReader bf=new BufferedReader(new InputStreamReader(urlc.getInputStream(),"UTF-8"));
String len=null;
while ((len=bf.readLine())!=null){
System.out.println(len);
}
} catch (Exception e) {
e.printStackTrace();
}