通过url地址抓取网页html代码

import java.io.BufferedReader;import java.io.InputStreamReader;import java.net.HttpURLConnection;import java.net.URL;public class URLUtil {  public static String getHtml(String urlString) {    try {       StringBuffer html = new StringBuffer();       URL url = new URL(urlString);       HttpURLConnection conn = (HttpURLConnection) url.openConnection();       InputStreamReader isr = new InputStreamReader(conn.getInputStream());       BufferedReader br = new BufferedReader(isr);       String temp;      while ((temp = br.readLine()) != null) {         html.append(temp).append("\n");       }       br.close();       isr.close();      return html.toString();     } catch (Exception e) {       e.printStackTrace();      return null;     }   }  public static void main(String[] args) {     System.out.println(URLUtil.getHtml("http://www.fastunit.com"));   }}