jsoup url 3times

jsoup java 샘플 소스

 public static void main(String[] args) {  
     String[] urls = new String[]{"http://www.dmoz.org/", "http://www.dmoz.org/Computers/Computer_Science/","https://docs.oracle.com/en/"};  
     // Create and start workers  
       List workers = new ArrayList<>(urls.length);  
    for (String url : urls) {  
       Worker w = new Worker(url);   
   workers.add(w);   
   new Thread(w).start();  
   }  
     // Retrieve results    
       for (Worker w : workers) {  
       Elements results = w.waitForResults();  
       if (results != null)  
         System.out.println(w.getName()+": "+results.size());  
   else  
         System.err.println(w.getName()+" had some error!");    }  
   }  
 }  
 class Worker implements Runnable {  
   private String url;   
  private Elements results;  
   private String name;  
   private static int number = 0;  
   private final Object lock = new Object();  
   public Worker(String url)  
  {  
     this.url = url;  
     this.name = "Worker-" + (number++);  
  }  
   public String getName()  
  {  
     return name;  
  }  
   @Override  
   public void run() {  
     try {  
       Document doc = Jsoup.connect(this.url).get();  
       Elements links = doc.select("a");  
       // Update results  
       synchronized (lock) {  
         this.results = links;  
         lock.notifyAll();  
   }  
     } catch (IOException e) {  
       // You should implement a better error handling code..  
       System.err.println("Error while parsing: "+this.url);  
       e.printStackTrace();  
   }  
   }  
   public Elements waitForResults() {  
     synchronized (lock) {  
       try {  
         while (this.results == null) {  
           lock.wait();  
    }  
         return this.results;  
   } catch (InterruptedException e)  
   {  
         // Again better error handling  
         e.printStackTrace();  
   }  
       return null;  
   }  
   }