java 如何大量访问某个网站

public static String getHtmlCode(String path) {

		String html = "", temp = "";

		try {

            URL u = new URL(path);

            URLConnection connection = u.openConnection();

            HttpURLConnection htCon = (HttpURLConnection) connection;

            htCon.addRequestProperty("baiduspider User-Agent", "Mozilla/5.0 (compatible; Baiduspider/2.0; +http://www.baidu.com/search/spider.html)");

            int code = htCon.getResponseCode();

            if (code == HttpURLConnection.HTTP_OK) {

                System.out.println("find the website");

                BufferedReader in=new BufferedReader(new InputStreamReader(htCon.getInputStream()));

                while ((temp = in.readLine()) != null) 

                        html = html + " " + temp;

                    in.close();

                    htCon.disconnect();

            }

            else {

                System.out.println("Can not access the website");

            }

        }

        catch(MalformedURLException e ) {  

            System.out.println("Wrong URL");

        }

        catch(IOException e) {

            System.out.println("Can not connect");

        }

		return html;

	}