A class that displays information about a URL : URL « Network « Java Tutorial

1. Java Tutorial
2. Network
3. URL

import java.io.IOException;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLConnection;
import java.util.Date;

/**
 * A class that displays information about a URL.
 */
public class GetURLInfo {
  /** Use the URLConnection class to get info about the URL */
  public static void printinfo(URL url) throws IOException {
    URLConnection c = url.openConnection(); // Get URLConnection from URL
    c.connect(); // Open a connection to URL

    // Display some information about the URL contents
    System.out.println("  Content Type: " + c.getContentType());
    System.out.println("  Content Encoding: " + c.getContentEncoding());
    System.out.println("  Content Length: " + c.getContentLength());
    System.out.println("  Date: " + new Date(c.getDate()));
    System.out.println("  Last Modified: " + new Date(c.getLastModified()));
    System.out.println("  Expiration: " + new Date(c.getExpiration()));

    // If it is an HTTP connection, display some additional information.
    if (c instanceof HttpURLConnection) {
      HttpURLConnection h = (HttpURLConnection) c;
      System.out.println("  Request Method: " + h.getRequestMethod());
      System.out.println("  Response Message: " + h.getResponseMessage());
      System.out.println("  Response Code: " + h.getResponseCode());
    }
  }

  /** Create a URL, call printinfo() to display information about it. */
  public static void main(String[] args) {
    try {
      printinfo(new URL(args[0]));
    } catch (Exception e) {
      System.err.println(e);
      System.err.println("Usage: java GetURLInfo <url>");
    }
  }
}