利用java下载网页源代码的小程序

import java.net.URL;
import java.io.InputStream;
public class MyDownload {
    publicstatic void main(String[] args){
       try {
           URL conn= new URL("http://");
           InputStream in=conn.openStream();
           int n=in.available();
           byte[] buf=new byte[1024];
           while((n=in.read(buf))>=0){
               System.out.write(buf,0,n);
           }
           in.close();
       } catch (Exception e) {
           e.printStackTrace(); 
       }
    }
}