/*
 * Copyright (c) 2001 Matthew Feldt. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided the copyright notice above is
 * retained.
 *
 * THIS SOFTWARE IS PROVIDED ''AS IS'' AND WITHOUT ANY EXPRESSED OR
 * IMPLIED WARRANTIES.
 */

/**
 * URLModDate.java
 *
 * Java Examples In A Nutshell Copyright (c) 2000 David Flanagan
 * Exercise 5-1:
 * Using the URLConnection techniques demonstrated in Example 5-2, write a
 * program that prints the modification date of a specified URL.
 *
 * @author Matthew Feldt <developer@feldt.com>
 * @version 1.0, 03/02/2001 17:05
 */

package com.feldt.examples.net;
import java.net.*;
import java.io.*;
import java.util.*;

public class URLModDate {
	public static void printModifiedDate(URL url) throws IOException {
		URLConnection c = url.openConnection(); // get URLConnection from url
		c.connect();                            // open a connection to url

		// if its an HTTP connection display header info
		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());
		}

		// display the last modified date
		System.out.print("  Last Modified:    ");
		if (c.getLastModified() == 0)
			System.out.println("Not known.");
		else
			System.out.println(new Date(c.getLastModified()));
	}

	public static void main(String[] args) {
		final String usage = "Usage: java URLModDate <url>";

		if (args.length != 1) {
			System.err.println(usage);
			System.exit(-1);
		}

		try {
			printModifiedDate(new URL(args[0]));
		} catch(IOException e) {
			System.err.println(e.getMessage());
			System.err.println(usage);
			System.exit(-1);
		}
	}
}