var isChecked = $('#myCheckBox').attr('checked');
$('#myCheckBox').attr('checked', true|false);
if($('#input_text').val().length == 0) {
// Empty field.
}
Como tuve que pasar un rato leyendo el foro para averiguar como personalizar el menú, dejo a disposición una pequeña guía de cómo hacerlo para todo aquel que quiera evitar rascarse la cabeza un rato.
Guardamos los cambios y publicamos la página.
import java.util.HashSet;Salida del programa:
import java.util.Set;
/**
* Test code to find missing letters of the alphabet from a String sentence.
* @author gabriel.solano
*
*/
public class MissingLetters {
private final int ASCII_CODE_FOR_LETTER_A = 97;
private final int ASCII_CODE_FOR_LETTER_Z = 122;
/**
* Gets the missing letters of a sentence in lower case.
* @param sentence
* @return String having all the letters that the sentence is missing from the alphabet.
*/
public String getMissingLetters(String sentence){
/*
* 1. Let's populate a set with the unique characters of the sentence.
* This approach avoids having two nested for's in the code (better performance).
*/
Set<Integer> uniqueASCIICodes = new HashSet<Integer>();
for (char character : sentence.toLowerCase().toCharArray() ) {
if (character >= ASCII_CODE_FOR_LETTER_A
&& character <= ASCII_CODE_FOR_LETTER_Z) { // Range of lower case letters.
uniqueASCIICodes.add((int)character);
if (uniqueASCIICodes.size() == 26) {
break; // Sentence already covered all letter from the alphabet.
}
}
}
/*
* 2. Move in the range of ascii codes of lower case alphabet
* and check if letter was present in sentence.
*/
StringBuilder misingLettersBuilder = new StringBuilder();
for (int i=ASCII_CODE_FOR_LETTER_A; i <= ASCII_CODE_FOR_LETTER_Z; i++) {
if (!uniqueASCIICodes.contains(i)) {
misingLettersBuilder.append((char)i);
}
}
return misingLettersBuilder.toString();
}
public static void main(String[] args) {
String case1 = "A quick brown fox jumps over the lazy dog";
String case2 = "bjkmqz";
String case3 = "cfjkpquvwxz";
String case4 = "";
MissingLetters missingLetters = new MissingLetters();
System.out.println("Missing letters for[" + case1 + "]: " +
missingLetters.getMissingLetters(case1));
System.out.println("Missing letters for[" + case2 + "]: " +
missingLetters.getMissingLetters(case2));
System.out.println("Missing letters for[" + case3 + "]: " +
missingLetters.getMissingLetters(case3));
System.out.println("Missing letters for[" + case4 + "]: " +
missingLetters.getMissingLetters(case4));
}
}
<web-app id="WebApp_ID" version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
Dependency injection when you only have one dependency from JavaZone on Vimeo.
Hibernate should be to programmers what cake mixes are to bakers: beneath their dignity. from JavaZone on Vimeo.
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import javax.activation.MimetypesFileTypeMap;
import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* A simple Servlet to download a file.
* @author gabriel.solano
*
*/
public class DownloadServlet extends HttpServlet{
private static final long serialVersionUID = 4440011247408877539L;
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
downloadFile(resp,
this.getServletContext().getRealPath("/WEB-INF/myFile.pdf"));
}
protected void downloadFile(HttpServletResponse response, String filePath)
throws ServletException, IOException {
File fileToDownload = new File(filePath);
FileInputStream fileInputStream = new FileInputStream(fileToDownload);
ServletOutputStream out = response.getOutputStream();
String mimeType = new MimetypesFileTypeMap().getContentType(filePath);
response.setContentType(mimeType);
response.setContentLength(fileInputStream.available());
response.setHeader( "Content-Disposition", "attachment; filename=\""
+ fileToDownload.getName() + "\"" );
int c;
while((c=fileInputStream.read()) != -1){
out.write(c);
}
out.flush();
out.close();
fileInputStream.close();
}
}
import java.io.IOException;
import java.net.URL;
import org.htmlparser.Node;
import org.htmlparser.Tag;
import org.htmlparser.lexer.Lexer;
import org.htmlparser.util.ParserException;
/**
* Parses the HTML code of the page specified by it's URL.
* @author gabriel.solano
*
*/
public class URLHTMLParser {
/*
* Tag handler that will be used to process the tags.
* (This could be improved by implementing an observer
* pattern to be able to add more than one TagHandler)
*/
private TagHandler tagHandler;
/**
* Constructor.
* @param tagHandler
*/
public URLHTMLParser(TagHandler tagHandler) {
this.tagHandler = tagHandler;
}
/**
* Scans the specified URL.
* @param url
* @throws ParserException
* @throws IOException
*/
public void scanURL(URL url) throws ParserException, IOException {
Lexer lexer = new Lexer(url.openConnection());
extractHTMLNodes(lexer);
}
/**
* Extracts the HTML nodes and lets the TagHandler to do something
* with the tags.
* @param lexer
* @throws ParserException
*/
private void extractHTMLNodes(Lexer lexer) throws ParserException {
Node node;
while (null != (node = lexer.nextNode(false))) {
if (node instanceof Tag) {
Tag tag = (Tag) node;
tagHandler.handleTag(tag);
}
}
}
}
import org.htmlparser.Tag;
/**
* Defines the interface for a TagHandler.
* @author gabriel.solano
*
*/
public interface TagHandler {
/**
* Handles the process of an HTML tag.
* @param tag
*/
public void handleTag(Tag tag);
}
import java.util.HashSet;
import java.util.Set;
import org.htmlparser.Tag;
/**
* Handles the event when an anchor tag is found while parsing
* HTML code of a page.
* This class has a functionality to count all absolute URLs
* found in the parsing process.
* @author gabriel.solano
*
*/
public class AnchorTagHandler implements TagHandler{
private Set<String> absoluteURLs; // All URLs found.
/**
* Constructor.
*/
public AnchorTagHandler() {
absoluteURLs = new HashSet<String> ();
}
/**
* Gets the found absolute URLs.
* The collection is filled only during the scanning process
* of an HTML page.
* @return
*/
public Set<String>getAbsoluteURLs() {
return absoluteURLs;
}
/**
* Handles the tag only if it is an anchor tag.
*/
public void handleTag(Tag tag) {
if (tag.getTagName().equalsIgnoreCase("a")) {
// Process only if it's an anchor tag.
processTag(tag);
}
}
/**
* Processes the anchor tag. In this case
* adds all absolute URL's found.
* @param tag
*/
private void processTag(Tag tag) {
String href = tag.getAttribute("href");
if (href != null) {
href = href.toLowerCase();
if (href.startsWith("http://") || href.startsWith("https://")) {
// Add all URLs with HTTP protocol.
absoluteURLs.add(href);
}
}
}
}
import java.net.URL;
import java.util.Set;
public class FindAbsoluteURLs {
public static void main(String[] args) {
AnchorTagHandler anchorTagHandler = new AnchorTagHandler();
URLHTMLParser htmlParser = new URLHTMLParser(anchorTagHandler);
try {
htmlParser.scanURL(new URL("http://www.crjug.org/"));
Set<String>urls = anchorTagHandler.getAbsoluteURLs();
for(String url : urls) {
System.out.println(url);
}
} catch (Exception e) {
e.printStackTrace();
}
}
}
<dependency>
<groupId>org.htmlparser</groupId>
<artifactId>htmlparser</artifactId>
<version>1.6</version>
</dependency>
require_once 'phpcache.class.php'; // Se incluye la clase de PHPCache.
// Parametros de conexión de la Base de datos.
$database = array(
'type' => 'mysql',
'name' => 'YOUR DATABASE NAME',
'table' => 'PHPCache',
'user' => 'YOUR DATABASE USERNAME',
'pass' => 'YOUR DATABASE USERNAME\'S PASSWORD',
'host' => 'localhost' /* Or maybe IP address of your database server */
);
// Llamado de configuración de la base de datos.
PHPCache::configure($database);
// Se obtiene una única instancia (patrón Singleton).
$cache = PHPCache::instance();
// Se pregunta primero si los resultados ya están en cache.
if( ($results = $cache->get('result_of_some_nasty_code')) !== false ) {
$tpl->assign($results);
/* Or maybe return $results or whatever depending on where you use this */
} else {
// Los datos todavía no estan en cache. Hay que obtenerlos de la manera lenta.
/***********************
* Your slow code here
***********************/
// Inmediatamente se guardan en cache. La siguiente vez no se hará de la forma lenta.
$cache->store('result_of_some_nasty_code', $results_of_your_slow_code, PHPCACHE_1_HOUR * 5); /* Cache for 5 hours */
}
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.io.StringWriter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.actions.DownloadAction;
public class OutputPDFAction extends DownloadAction {
@Override
protected StreamInfo getStreamInfo(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response) throws Exception {
try{
// Code might throw an exception.
response.setHeader("Content-disposition", "attachment; filename=patient_diary.pdf");
String contentType = "application/x-download";
return new ByteDownloadStreamInfo(contentType,abyte0);
}
catch(Throwable throwable)
{
response.setHeader("Content-disposition", "attachment; filename=error.txt");
String contentType = "application/x-download";
return new ByteDownloadStreamInfo(contentType,
stackTraceToString(throwable).getBytes());
}
}
private String stackTraceToString(Throwable e) {
String retValue = null;
StringWriter sw = null;
PrintWriter pw = null;
try {
sw = new StringWriter();
pw = new PrintWriter(sw);
e.printStackTrace(pw);
retValue = sw.toString();
} finally {
try {
if(pw != null) pw.close();
if(sw != null) sw.close();
} catch (IOException ignore) {}
}
return retValue;
}
class ByteDownloadStreamInfo implements StreamInfo {
private byte[] bytes;
private String contentType;
public ByteDownloadStreamInfo(String contentType, byte[] bytes) {
this.bytes = bytes;
this.contentType=contentType;
}
public String getContentType() {
return this.contentType;
}
public InputStream getInputStream() throws IOException {
return new ByteArrayInputStream(this.bytes);
}
}
}
<?php
class DateUtils {
public static function get_current_date() {
return substr(DateUtils::get_current_date_time(), 0, 10);
}
public static function get_current_date_time() {
return date('Y-m-d H:i:s');
}
public static function get_day_of_current_week_as_number() {
return date("w",mktime());
}
public static function get_day_of_week_as_number($date_as_string) {
return date("w", strtotime($date_as_string));
}
public static function substract_days_to_current_date($days) {
$operation = "-";
if ($days < 0) {
$operation = "+";
$days = abs($days);
}
$newdate = strtotime ( $operation. $days .' day' ,strtotime ( date('Y-m-d') )) ;
return date ( 'm-d-Y' , $newdate );
}
public static function substract_days_to_date($date_as_string, $days) {
$operation = "-";
if ($days < 0) {
$operation = "+";
$days = abs($days);
}
$newdate = strtotime ( $operation . $days .' day' , strtotime ( $date_as_string) ) ;
$newdate = date ( 'm-d-Y' , $newdate );
return $newdate;
}
public static function get_start_day_of_current_work_week() {
$monday_delta = 0;
$current_day_of_week = DateUtils::get_day_of_current_week_as_number();
if($current_day_of_week > 1) {
$monday_delta = $current_day_of_week-1;
} else if($current_day_of_week == 0){
$monday_delta = -1;
}
return DateUtils::substract_days_to_current_date($monday_delta);
}
public static function get_start_day_of_work_week($date_as_string) {
$monday_delta = 0;
$day_of_week = DateUtils::get_day_of_week_as_number($date_as_string);
if($day_of_week > 1) {
$monday_delta = $day_of_week-1;
} else if($day_of_week == 0){
$monday_delta = -1;
}
return DateUtils::substract_days_to_date($date_as_string, $monday_delta);
}
public static function get_delta_for_end_day_of_work_week($current_day_of_week) {
$friday_delta = 0;
switch ($current_day_of_week) {
case 0: // Sunday.
$friday_delta=-5;
break;
case 1: // Monday.
$friday_delta=-4;
break;
case 2: // Tuesday.
$friday_delta=-3;
break;
case 3: // Wednesday.
$friday_delta=-2;
break;
case 4: // Thursday.
$friday_delta=-1;
break;
case 5: // Friday.
$friday_delta=0;
break;
case 6: // Saturday.
$friday_delta=1;
break;
}
return $friday_delta;
}
public static function get_end_day_of_current_work_week() {
$friday_delta = 0;
$current_day_of_week = DateUtils::get_day_of_current_week_as_number();
return DateUtils::
substract_days_to_current_date(DateUtils::
get_delta_for_end_day_of_work_week($current_day_of_week ));
}
public static function get_end_day_of_work_week($date_as_string) {
$friday_delta = 0;
$current_day_of_week = DateUtils::get_day_of_week_as_number($date_as_string);
return DateUtils::
substract_days_to_date($date_as_string, DateUtils::
get_delta_for_end_day_of_work_week($current_day_of_week ));
}
public static function get_current_work_week_range() {
return "From: " . DateUtils::get_start_day_of_current_work_week() . " To: "
. DateUtils::get_end_day_of_current_work_week();
}
}
echo "<h1>" . DateUtils::get_current_work_week_range() . "</h1>";
?>
<html>
<body>
<script type="text/javascript">
var form=document.createElement("form");
form.setAttribute("action","target.php");
form.setAttribute("method","get");
var input=document.createElement("input");
input.setAttribute("value","x12kfh378");
input.setAttribute("type","hidden");
form.appendChild(input);
document.body.appendChild(form);
form.submit();
</script>
</body>
</html>
<struts>
<constant name="struts.multipart.maxSize" value="50000000" />
....
</struts>
<catalog>
<catalog-name>My Favorite Music</catalog-name>
<cd id="cd-001">
<title value="Empire Burlesque" />
<artist value="Bob Dylan" />
<country value="USA" />
<company value="Columbia" />
<price value="10.90" />
<year value="1985" />
</cd>
<cd id="cd-002">
<title value="Hide your heart" />
<artist value="Bonnie Tyler" />
<country value="UK" />
<company value="CBS Records" />
<price value="9.90" />
<year value="1988" />
</cd>
<cd id="cd-003">
<title value="Greatest Hits" />
<artist value="Dolly Parton" />
<country value="USA" />
<company value="RCA" />
<price value="9.90" />
<year value="1982" />
</cd>
</catalog>
<?php
$cdCatalogXMLReader = new CDCatalogXMLReader();
$cdCatalogXMLReader->showCatalogAsTable('cd-catalog.xml');
class CDCatalogXMLReader {
public function showCatalogAsTable($xmlPath) {
// Loads XML.
$doc = new DOMDocument();
$doc->load($xmlPath);
// Reading tag's value.
$title = $doc->getElementsByTagName("catalog-name")
->item(0)->nodeValue;
echo "<h1>$title</h1>";
// Reading all elements with tag name="cd".
$cds = $doc->getElementsByTagName( "cd" );
echo '<table border="1">';
echo '<tr><th>ID</th><th>Title</th><th>Artist</th><th>Country</th><th>Company</th><th>Price</th><th>Year</th></tr>';
foreach ($cds as $cd) {
echo '<tr>';
// Reading attributes.
echo '<td>' . $cd->getAttribute('id') . '</td>';
echo '<td>' . $cd->getElementsByTagName("title")->item(0)->getAttribute('value') . '</td>';
echo '<td>' . $cd->getElementsByTagName("artist")->item(0)->getAttribute('value') . '</td>';
echo '<td>' . $cd->getElementsByTagName("country")->item(0)->getAttribute('value') . '</td>';
echo '<td>' . $cd->getElementsByTagName("company")->item(0)->getAttribute('value') . '</td>';
echo '<td>' . $cd->getElementsByTagName("price")->item(0)->getAttribute('value') . '</td>';
echo '<td>' . $cd->getElementsByTagName("year")->item(0)->getAttribute('value') . '</td>';
echo '</tr>';
}
echo '</table>';
}
}
?>
| ID | Title | Artist | Country | Company | Price | Year |
|---|---|---|---|---|---|---|
| cd-001 | Empire Burlesque | Bob Dylan | USA | Columbia | 10.90 | 1985 |
| cd-002 | Hide your heart | Bonnie Tyler | UK | CBS Records | 9.90 | 1988 |
| cd-003 | Greatest Hits | Dolly Parton | USA | RCA | 9.90 | 1982 |
public class Sheep implements Cloneable {
protected String dna;
protected final char [] DNA_ALPHABET = {'A','C','T','G'};
public String getDNA() {
return dna;
}
public Sheep() {
// Simulates extremely long process to create a sheep.
StringBuilder dnaBuilder = new StringBuilder();
for(int i=0; i < 30; i++) {
int alphabetIndex = (int) (Math.random() * 10 % 4);
dnaBuilder.append(DNA_ALPHABET[alphabetIndex]);
}
dna = dnaBuilder.toString();
}
@Override
public Object clone() throws CloneNotSupportedException {
return super.clone();
}
public static void main(String[] args) {
Sheep dolly = new Sheep();
System.out.println("Dolly was born: " + dolly.getDNA());
try {
Sheep dollyClon = (Sheep) dolly.clone();
System.out.println("Dolly Clon: " + dollyClon.getDNA());
} catch (CloneNotSupportedException e) {
e.printStackTrace();
}
}
}
<?php
//MyDB represents the name of your database.
//MyTable represents the name of your table inside the database.
mysql_connect("localhost","my_user","my_pass") or die("Unable to connect to SQL server");
@mysql_select_db("my_database") or die("Unable to select database");
$result = mysql_query("select * from MY_TABLE limit 500");
?>
<table border="1">
<tr>
<?php
while ($field=mysql_fetch_field($result)) {
echo "<th>";
echo "$field->name";
echo "</th>";
}
echo "</tr>";
while ($row = mysql_fetch_row($result)) {
echo "<tr>";
for ($i=0; $i<mysql_num_fields($result); $i++) {
echo "<td>";
if (isset($row[$i]))
echo "$row[$i]";
else
echo "-";
echo "</td>";
}
echo "</tr>\n";
}
echo "</table>";
?>
<catalog>
<cd id="cd-001">
<param name="title" value="Empire Burlesque" />
<param name="artist" value="Bob Dylan" />
<param name="country" value="USA" />
<param name="company" value="Columbia" />
<param name="price" value="10.90" />
<param name="year" value="1985" />
</cd>
<cd id="cd-002">
<param name="title" value="Hide your heart" />
<param name="artist" value="Bonnie Tyler" />
<param name="country" value="UK" />
<param name="company" value="CBS Records" />
<param name="price" value="9.90" />
<param name="year" value="1988" />
</cd>
<cd id="cd-003">
<param name="title" value="Greatest Hits" />
<param name="artist" value="Dolly Parton" />
<param name="country" value="USA" />
<param name="company" value="RCA" />
<param name="price" value="9.90" />
<param name="year" value="1982" />
</cd>
</catalog>
<html>
<head>
<title>XML into associative array with JQuery</title>
<script type="text/javascript" src="jquery-1.5.2.min.js"></script>
<script type="text/javascript">
var cdArray = new Array(); // Will hold the XML data.
// Request to XML.
$.ajax({
type: "GET",
url: "cd-catalog.xml",
dataType: "xml",
async: false,
success: readXMLIntoArray
});
/**
Move XML data into associative array.
*/
function readXMLIntoArray(xml) {
$(xml).find('cd').each(function(){
var id = $(this).attr('id');
var parametersArray = new Array();
$(this).find('param').each(function(){
var name = $(this).attr('name');
var value = $(this).attr('value');
parametersArray[name] = value;
});
cdArray[id] = parametersArray;
});
}
// Testing array
document.write("<p>Title:" + cdArray["cd-002"]["title"] + "</p>");
document.write("<p>Artist:" + cdArray["cd-002"]["artist"] + "</p>");
</script>
</head>
<body>
</body>
</html>
setcookie("cookieName", "cookieValue", time() * 3600 * 24 * 30 /*30 days*/, "/");
if (someString != null && someString != "") { // Do something.}
PHPif (isset(someString) && ! empty(someString)) { // Do something. }
if (plainString.contains("foo!")) { // Do something. }
PHPif (strpos($plainString, "foo!") !== false) { // Do something. }
myString = myString.replace("x", "y");
str_replace("x", "y", myString);
int size= array.length;
$size = count($array);
<literal class="html">
Aquí va el código HTML...
</literal>
“Las compañías contratan gente brillante, con un alto IQ y luego la organización tiende a desecharlos por políticas y prácticas que inhiben la creación de valor.”3
