java.net.URL 练习

package pak1;import java.net.URL;import java.io.*;public class UrlPractise {    protected static InputStreamReader IStream = new InputStreamReader(System.in);    protected static BufferedReader bf = new BufferedReader(IStream);    public static void main(String [] args) throws IOException {        URL myUrl = null;        File f = new File("urlReader.html");        FileWriter fw = new FileWriter(f);        String urlString  = bf.readLine();        myUrl = new URL(urlString);          System.out.println(urlString);          System.out.println(myUrl.getProtocol());        System.out.println(myUrl.getHost());        if(myUrl.getPort() == -1)            System.out.println(80);        else            System.out.println(myUrl.getPort());        System.out.println(myUrl.getPath());        fw.write(urlString);        fw.flush();   } }