java 根据网址 获取内容 并输出到控制台

package cn.yzy;

import java.io.IOException;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.Scanner;

public class Main {

/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub

Scanner scanner;
URL url;
Thread readURL;		//new一个线程
Look look = new Look();

System.out.println("请输入URL地址，如：http://www.yahoo.com");
scanner = new Scanner(System.in);
String source = scanner.nextLine();		//接受一个url

try {
url = new URL(source);
look.setUrl(url);
readURL = new Thread(look);		//开启网页内容获取
readURL.start();
} catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}

}

class Look implements Runnable{

URL url;

public void setUrl(URL url) {
this.url = url;
}

@Override
public void run() {
// TODO Auto-generated method stub

try {
InputStream in = url.openStream();		//打开url
byte b[] = new byte[1024];
int n = -1;
while((n = in.read(b)) != -1) {
String str = new String(b,0,n);		//读取文本，并输出
System.out.print(str);
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}