Source Code : Using the URL Class (GetURL.java)

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Using the URL Class (GetURL.java)

     
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.MalformedURLException;
import java.net.URL;

/**
 * Chapter 2 Example
 * 
 * This program uses the standard Java URL class to open a connection to a web
 * page and download the contents.
 * 
 * @author Jeff Heaton
 * @version 1.0
 */
public class GetURL {

  /**
   * This method will display the URL specified by the parameter.
   * 
   * @param u
   *            The URL to display.
   */
  static protected void getURL(String u) {
    URL url;
    InputStream is;
    InputStreamReader isr;
    BufferedReader r;
    String str;

    try {
      System.out.println("Reading URL: " + u);
      url = new URL(u);
      is = url.openStream();
      isr = new InputStreamReader(is);
      r = new BufferedReader(isr);
      do {
        str = r.readLine();
        if (str != null)
          System.out.println(str);
      } while (str != null);
    } catch (MalformedURLException e) {
      System.out.println("Must enter a valid URL");
    } catch (IOException e) {
      System.out.println("Can not connect");
    }
  }

  /**
   * Program entry point.
   * 
   * @param args
   *            Command line arguments. Specified the URL to download.
   */
  static public void main(String args[]) {
    if (args.length < 1)
      System.out.println("Usage: GetURL ");
    else
      getURL(args[0]);
  }
}

           
         
    
    
    
    
  

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