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/* * Default constructor. With no specification of security option, * this constructor defaults to lower security, higher performance. */

public RandomGUID() { getRandomGUID(false); } /* * Constructor with security option. Setting secure true * enables each random number generated to be cryptographically * strong. Secure false defaults to the standard Random function seeded * with a single cryptographically strong random number. */ public RandomGUID(boolean secure) { getRandomGUID(secure); } /* * Method to generate the random GUID */ private void getRandomGUID(boolean secure) { MessageDigest md5 = null; StringBuffer sbValueBeforeMD5 = new StringBuffer(); try { md5 = MessageDigest.getInstance("MD5"); } catch (NoSuchAlgorithmException e) { System.out.println("Error: " + e); } try { long time = System.currentTimeMillis(); long rand = 0; if (secure) { rand = mySecureRand.nextLong(); } else { rand = myRand.nextLong(); } // This StringBuffer can be as long as you need; the MD5 // hash will always return 128 bits. You can change // the seed to include anything you want here. // You could even stream a file through the MD5, making // the odds of guessing it at least as great as that // of guessing the contents of the file! sbValueBeforeMD5.append(s_id); sbValueBeforeMD5.append(":"); sbValueBeforeMD5.append(Long.toString(time)); sbValueBeforeMD5.append(":"); sbValueBeforeMD5.append(Long.toString(rand)); valueBeforeMD5 = sbValueBeforeMD5.toString(); md5.update(valueBeforeMD5.getBytes()); byte[] array = md5.digest(); StringBuffer sb = new StringBuffer(); for (int j = 0; j < array.length; ++j) { int b = array[j] & 0xFF; if (b < 0x10) sb.append('0');

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Also, servlets may be used to authenticate users and control their access to server-side resources (such as data or metadata) According to Servlet Best Practices, Part 1 (http://wwwonjavacom/lpt/a/2825), since their introduction in 1996 servlets have dominated the server-side Java landscape and have become the standard way to interface Java to the Web They are the foundation technology on which Java developers build web applications and, increasingly, web services This chapter discusses best practices for servlet-based communication using JDBC development and deployment According to Sun (http://javasuncom/products/servlet/), Java servlet technology provides web developers with a simple, consistent mechanism for extending the functionality of a web server and for accessing existing business systems You can think of a servlet as an applet that runs on the server side without a face or presentation Java servlets have made many web applications possible.

src="a1.jpg" src="a2.jpg" src="a3.jpg" src="a4.jpg"

sb.append(Integer.toHexString(b)); } valueAfterMD5 = sb.toString(); } catch (Exception e) { System.out.println("Error:" + e); } }

/* * Convert to the standard format for GUID * (Useful for SQL Server UniqueIdentifiers, etc.) * Example: C2FEEEAC-CFCD-11D1-8B05-00600806D9B6 */ public String toString() { String raw = valueAfterMD5.toUpperCase(); StringBuffer sb = new StringBuffer(); sb.append(raw.substring(0, 8)); sb.append("-"); sb.append(raw.substring(8, 12)); sb.append("-"); sb.append(raw.substring(12, 16)); sb.append("-"); sb.append(raw.substring(16, 20)); sb.append("-"); sb.append(raw.substring(20)); return sb.toString(); } /** * Return a random GUID. */ public static String getGUID() { RandomGUID myGUID = new RandomGUID(); return myGUID.valueAfterMD5; } /* * For Debugging purposes only. * Demonstraton and self-test of class. */ public static void main(String args[]) { // 64A4DD34-78C2-FB3C-7075-5198CB9C7868 // 64a4dd3478c2fb3c70755198cb9c7868 long start = System.currentTimeMillis(); for (int i=0; i< 10; i++) { RandomGUID myGUID = new RandomGUID(); //System.out.println("Seeding String=" + myGUID.valueBeforeMD5); System.out.println("rawGUID=" + myGUID.valueAfterMD5); //System.out.println("RandomGUID=" + myGUID.toString()); } long end = System.currentTimeMillis(); long time = end - start; System.out.println("time="+time);

You can see that the four icon images are displayed via img elements that are nested inside the div element of the class small. To define the width, height, and border properties of the img element, we define a type selector in the style sheet file style.css, which may appear as shown here: style.css .small img { border:none;margin:10px;width:60px; height:60px; } The jQuery code to enlarge the icon in place when the mouse pointer is over it is shown here: $(document).ready(function() { $(".small a").hover( function(){ $(this).find('img').css({'width':200,'height': 200}); }, function(){ $(this).find('img').css({'width':60,'height': 60}); } ); });

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