web application
Configure a Servlet in Tomcat
<ul>
<li>Create a Servlet class and add it to your webapplication<li>
<li>Configure tomcat so he knows who to call the servlet</li>
<li>Test if the servlet is called, if the url is entered into the browser</li>
<ul>
Embed Calendar
When creating Blogs or Websites, it's sometimes helpful to have a calendar on the site. This is often needed to inform certain members of a group or organization about a schedule or certain events. While it can be painful to create a calendar on your own, there are online calendars which can be embedded into a webpage very easily.
Task:
<ul><li>Find an online calendar of your choice.</li>
<li>Learn how to embed this calendar into your webpage.</li>
<li>Try to customize color and size of the calendar.</li></ul>
Taggings:
Open Remote Tabs
Nowadays, there are many different browsers available. Sometimes we want or have to change between them because every browser has its advantages and disadvantages. Furthermore, at work, people often use a different browser (e.g. Internet Explorer) than at home (e.g. Google Chrome, Mozilla Firefox). Now, when coming home, there should be an easy way to re-open the tabs they had open at work or simply at a different location.
Every modern browser allows to open many tabs. However, it is not easy to move these tabs from one browser to another.
Challenge:
<ul><li>Find an <strong>easy</strong> way to open tabs in the browser of your choice that you recently opened in another browser.</li><li>Choose at least <strong>two</strong> different browsers to work with.</li><li>This should also work when the remote browser is already closed.</li></ul>
Taggings:
Running WEB tests as JUnit tests
The test records clicks, userInput and can be replayed. Furthermore JUnit tests are performed and recorded.
KeyListener works in Applet but not in JApplet
Following scenario:
A simple Applet implementing the KeyListener
<code>
public class AppletMain extends Applet implements KeyListener{
}
</code>
Therefore you have to override following methods:
<code>
public void keyPressed(KeyEvent k) {
}
public void keyReleased(KeyEvent k) {
}
public void keyTyped(KeyEvent k) {
System.out.println("A key has been typed");
}
</code>
This works perfectly, unfortunatly if I change it to a JApplet the Keys are not recognized anymore
Reload Properties File (via ResourceBundle)
The Problem can be reproduced by doing following steps:
1. Step.:
Loading a Properties File via ResourceBundle rb = ResourceBundle.getBundle("file.properties");
2. Step.:
Changing/Adding values to the properties file and saving it.
3. Step.: Accessing/Reading the properties file again.
Step 3 is not trivial as ResourceBundle keeps the properties file cached. Therefore you can't access the new values of the properties file. Though there is a function "rb.clearCache()" which should do excatly what I want it does not! work.
Therefore a workaround is needed.
Preventing SQL-Injection in a Java application
Sql-Injection is a technique to inject (or execute) SQL commands within an application (database). It is mainly used to gain access to a databases content for which one has no authorization. The method injects SQL commands by providing input to a SQL statement which contains SQL meta-characters.
Example statement: <strong>select * from user where username='input'</strong>
SQL injected input:<strong>user' OR '1'='1</strong>
The final statement:<strong>select * from user where username='user' OR '1'='1'</strong>
Since 1 always equals 1, this statement would return all the users in the database!
Depending on the SQL command, an attacker could insert, modify, extract and delete data in the database.
Securing a service using WS-Security
<p>We have an existing Web-Service accessible to everyone who knows the address of the endpoint. The software used on the server:</p><ul><li>Java 6</li><li>Apache CXF 2.2.3</li><li>SOAP Webservice</li></ul><p>Because of massive abuse in the past the access should be limited to authorized people only. The login credentials are stored in a database and should be checked with every request made on the service. The login data should be transmitted in the SOAP-Envelope header and an interceptor should verify the data before the actual invocation of a webservice method. The solution should be based on an open standard which is well defined.</p>
Improving User Interaction on Web Applications
Indeed, tradtional web apps make use of XHTML and CSS, but this is only an attempt to inscrease flexibility on styling and structuring issues or no more than readability. However, concerns of user interactions are not beeing touched by these technologies.
Common technologies do not deal with interactions like drag'n'drop, autosuggestion or even to quash annoying page reloads on filling forms – to name but a few.
Which technologies are able to face this issues adequately, without reinventing the wheel nor requiring exotic and/or proprietary plugins.
Pages
- « first
- ‹ previous
- 1
- 2
- 3
- 4
