Java 使用URL从网络读取图片

import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.net.URL;


public class DownLoadImageNetwork {
    public static void main(String[] args) {
        try {
            URL url = new URL("http://www.baidu.com/img/logo_gif_be7507c6c688ba2bd085da2ad1015e7d.gif?v=19489737.gif");
            InputStream ins = url.openStream();
            File file = new File("c:\\test\\logo.gif");
            if(!file.exists()){
                file.createNewFile();
            }
            FileOutputStream fos = new FileOutputStream(file) ;
            byte[] buffer = new byte[1024];
            int hasRead = 0;
            while((hasRead = ins.read(buffer)) > 0){
                fos.write(buffer,0,hasRead);
            }
            ins.close();
            fos.close();
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
}