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URL对象调用InputStream openStream() 方法可以返回一个输入流，该输入流指向URL对象包含的资源。通过该输入流可以将服务器上的信息打印到客户端。

package URL;import java.util.Scanner;import java.net.*;public class Main {    public static void main(String []args){        Scanner in = new Scanner(System.in);        URL url;        Thread readURL;        Look look = new Look();        System.out.println("输入URL资源");        String source = in.nextLine();        try {            url = new URL(source);            look.setURL(url);            readURL = new Thread(look);        } catch (MalformedURLException e) {            e.printStackTrace();        }        readURL = new Thread(look);        readURL.start();    }}

Look.java

package URL;import java.io.IOException;import java.io.InputStream;import java.net.*;public class Look implements Runnable{       URL url;    public void setURL(URL url){        this.url = url;    }    public void run(){        try {            InputStream in = url.openStream();            byte [] b = new byte[1024];            int n = -1;            while((n = in.read(b)) != -1){                String str = new String(b,0,n);                System.out.println(str);            }        } catch (IOException e) {            System.out.println(e);        }    }}

例如抓取百度的资源: