Exercice: Télécharger localement quelques pages WEB  chacune dans un  fichier correspondant. Les pages WEB et les noms des fichiers correspondant se trouvent dans un fichier nommé url-list.txt sous le forme:

http://www.refg.tu-sofia.bg/CoursJava    cours.html
http://yahoo.com    yahoo.html


 
 
 
import java.util.Vector;
import java.io.*;
import java.net.*;
public class WebFetchApp {
   public static void main(String args[]){
        WebFetch fetch = new WebFetch();
        fetch.run();
   }
}
class WebFetch {
 String urlList = "url-list.txt";
 Vector URLs = new Vector();
 Vector fileNames = new Vector();
 public void getURLList() {
   try {
      BufferedReader inStream = new BufferedReader(new FileReader(urlList));
      String inLine;
      while((inLine = inStream.readLine()) != null) {
          inLine = inLine.trim();
          if(!inLine.equals("")) {
              int tabPos = inLine.lastIndexOf('\t');
              String url = inLine.substring(0,tabPos).trim();
              String fileName = inLine.substring(tabPos+1).trim();
              URLs.addElement(url);
              fileNames.addElement(fileName);
          }
      }
   } catch(IOException ex){
         error("Error reading "+urlList);
      }
 }		  public void run() {
  getURLList();
  int numURLs = URLs.size();
  for(int i=0;i<numURLs;++i)
   fetchURL((String) URLs.elementAt(i),(String) fileNames.elementAt(i));
  System.out.println("Done.");
 }
 public void fetchURL(String urlName,String fileName) {
  try{
   URL url = new URL(urlName);
   System.out.println("Getting "+urlName+"...");
   File outFile = new File(fileName);
   PrintWriter outStream = new PrintWriter(new FileWriter(outFile));
   BufferedReader inStream = new BufferedReader(
    new InputStreamReader(url.openStream()));
   String line; 
   while ((line = inStream.readLine())!= null) outStream.println(line);
   inStream.close();
   outStream.close();
  }catch (MalformedURLException ex){
   System.out.println("Bad URL");
  }catch (IOException ex){
   System.out.println("IOException occurred.");
  }
 }
 public void error(String s){
  System.out.println(s);
  System.exit(1);
 }
}