java抓取网页内容源代码

import java.io.*; 
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
/**
 * 
 * 
 * 
 * */
public class getWebpageContent {

public static void main(String[] args) throws IOException{
URL url=new URL("http://www.google.com");
URLConnection conn = url.openConnection();
BufferedReader br = new BufferedReader(new InputStreamReader(conn.getInputStream()));
    
    File file = new File("e://mydoc//aa.html"); 
    FileOutputStream fos=new FileOutputStream(file);
    BufferedWriter bw=new BufferedWriter(new OutputStreamWriter(fos));
   
    
    String str;
    while((str=br.readLine()) !=null){
     bw.write(str);
                bw.newLine();
     bw.flush();
    }
    
    br.close();
    fos.close();