java url

url内容下载

package URL;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
public class UrlDown {
    public static void main(String[] args) throws IOException {
        URL url = new URL("url地址");
        String urlname = url.getFile();
        String filename = urlname.substring(urlname.lastIndexOf("/")+1);
        HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();


        InputStream is = urlConnection.getInputStream();

        FileOutputStream fos = new FileOutputStream(filename);

        byte[] buffer = new byte[1024];
        int len;
        while ((len = is.read(buffer))!=-1){
            fos.write(buffer,0,len);
        }
        fos.close();
        is.close();
        urlConnection.disconnect();

    }

}