- What Is Facelets?
- Developing a Simple Facelets Application
- Templating
- Composite Components
- Resources
This chapter is from the book
This chapter is from the book
This chapter is from the book
Developing a Simple Facelets Application
This section describes the general steps involved in developing a JavaServer Faces application. The following tasks are usually required:
- Developing the backing beans
- Creating the pages using the component tags
- Defining page navigation
- Mapping the FacesServlet instance
- Adding managed bean declarations
Creating a Facelets Application
The example used in this tutorial is the guessnumber application. The application presents you with a page that asks you to guess a number between 0 and 10, validates your input against a random number, and responds with another page that informs you whether you guessed the number correctly or incorrectly.
Developing a Backing Bean
In a typical JavaServer Faces application, each page of the application connects to a backing bean, a type of managed bean. The backing bean defines the methods and properties that are associated with the components.
The following managed bean class, UserNumberBean.java, generates a random number from 0 to 10:
package guessNumber;
import java.util.Random;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.SessionScoped;
@ManagedBean
@SessionScoped
public class UserNumberBean {
Integer randomInt = null;
Integer userNumber = null;
String response = null;
private long maximum=10;
private long minimum=0;
public UserNumberBean() {
Random randomGR = new Random();
randomInt = new Integer(randomGR.nextInt(10));
System.out.println("Duke's number: " + randomInt);
}
public void setUserNumber(Integer user_number) {
userNumber = user_number;
}
public Integer getUserNumber() {
return userNumber;
}
public String getResponse() {
if ((userNumber != null) && (userNumber.compareTo(randomInt) == 0)) {
return "Yay! You got it!";
} else {
return "Sorry, " + userNumber + " is incorrect.";
}
}
public long getMaximum() {
return (this.maximum);
}
public void setMaximum(long maximum) {
this.maximum = maximum;
}
public long getMinimum() {
return (this.minimum);
}
public void setMinimum(long minimum) {
this.minimum = minimum;
}
}
Note the use of the @ManagedBean annotation, which registers the backing bean as a resource with JavaServer Faces implementation. The @SessionScoped annotation registers the bean scope as session.
Creating Facelets Views
Creating a page or view is the responsibility of a page author. This task involves adding components on the pages, wiring the components to backing bean values and properties, and registering converters, validators, or listeners onto the components.
For the example application, XHTML web pages serve as the front end. The first page of the example application is a page called greeting.xhtml. A closer look at various sections of this web page provides more information.
The first section of the web page declares the content type for the page, which is XHTML:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd ">
The next section declares the XML namespace for the tag libraries that are used in the web page:
<html xmlns="http://www.w3.org/1999/xhtml"
xmlns:h="http://java.sun.com/jsf/html"
xmlns:f="http://java.sun.com/jsf/core">
The next section uses various tags to insert components into the web page:
h:head>
<title>Guess Number Facelets Application</title>
</h:head>
<h:body>
<h:form>
<h:graphicImage value="#{resource['images:wave.med.gif']}"/>
<h2>
Hi, my name is Duke. I am thinking of a number from
#{userNumberBean.minimum} to #{userNumberBean.maximum}.
Can you guess it?
<p></p>
<h:inputText
id="userNo"
value="#{userNumberBean.userNumber}">
<f:validateLongRange
minimum="#{userNumberBean.minimum}"
maximum="#{userNumberBean.maximum}"/>
</h:inputText>
<h:commandButton id="submit" value="Submit"
action="response.xhtml"/>
<h:message showSummary="true" showDetail="false"
style="color: red;
font-family: 'New Century Schoolbook', serif;
font-style: oblique;
text-decoration: overline"
id="errors1"
for="userNo"/>
</h2>
</h:form>
</h:body>
Note the use of the following tags:
- Facelets HTML tags (those beginning with h:) to add components
- The Facelets core tag f:validateLongRange to validate the user input
An inputText component accepts user input and sets the value of the backing bean property userNumber through the EL expression #{userNumberBean.userNumber}. The input value is validated for value range by the JavaServer Faces standard validator f:validateLongRange.
The image file, wave.med.gif, is added to the page as a resource. For more details about the resources facility, see "Resources" on page 96.
A commandButton component with the ID submit starts validation of the input data when a user clicks the button. Using implicit navigation, the component redirects the client to another page, response.xhtml, which shows the response to your input.
You can now create the second page, response.xhtml, with the following content:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"
xmlns:h="http://java.sun.com/jsf/html">
<h:head>
<title>Guess Number Facelets Application</title>
</h:head>
<h:body>
<h:form>
<h:graphicImage value="#{resource['images:wave.med.gif']}"/>
<h2>
<h:outputText id="result" value="#{userNumberBean.response}"/>
</h2>
<h:commandButton id="back" value="Back" action="greeting.xhtml"/>
</h:form>
</h:body>
</html>
Configuring the Application
Configuring a JavaServer Faces application involves mapping the Faces Servlet in the web deployment descriptor file, such as a web.xml file, and possibly adding managed bean declarations, navigation rules, and resource bundle declarations to the application configuration resource file, faces-config.xml.
If you are using NetBeans IDE, a web deployment descriptor file is automatically created for you. In such an IDE-created web.xml file, change the default greeting page, which is index.xhtml,to greeting.xhtml. Here is an example web.xml file, showing this change in bold.
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.0" xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">
<context-param>
<param-name>javax.faces.PROJECT_STAGE</param-name>
<param-value>Development</param-value>
</context-param>
<servlet>
<servlet-name>Faces Servlet</servlet-name>
<servlet-class>javax.faces.webapp.FacesServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>Faces Servlet</servlet-name>
<url-pattern>/faces/*</url-pattern>
</servlet-mapping>
<session-config>
<session-timeout>
30
</session-timeout>
</session-config>
<welcome-file-list>
<welcome-file>faces/greeting.xhtml</welcome-file>
</welcome-file-list>
</web-app>
Note the use of the context parameter PROJECT_STAGE. This parameter identifies the status of a JavaServer Faces application in the software lifecycle.
The stage of an application can affect the behavior of the application. For example, if the project stage is defined as Development, debugging information is automatically generated for the user. If not defined by the user, the default project stage is Production.
Building, Packaging, Deploying, and Running the guessnumber Facelets Example
You can use either NetBeans IDE or Ant to build, package, deploy, and run the guessnumber example. The source code for this example is available in the tut-install /examples/web/guessnumber directory.
To Build, Package, and Deploy the guessnumber Example Using NetBeans IDE
- In NetBeans IDE, select File
Open Project. - In the Open Project dialog, navigate to:tut-install/examples/web/
- Select the guessnumber folder.
- Select the Open as Main Project check box.
- Click Open Project.
In the Projects tab, right-click the guessnumber project and select Deploy.
This option builds and deploys the example application to your GlassFish Server instance.
To Build, Package, and Deploy the guessnumber Example Using Ant
- In a terminal window, go to: tut-install /examples/web/guessnumber/
Type the following command:
ant
This command calls the default target, which builds and packages the application into a WAR file, guessnumber.war, that is located in the dist directory.
- Make sure that the GlassFish Server is started.
-
To deploy the application, type the following command:
ant deploy
To Run the guessnumber Example
- Open a web browser.
Type the following URL in your web browser:
http://localhost:8080/guessnumber
The web page shown in Figure 5–1 appears.
Figure 5–1 Running the Application
- In the text field, type a number from 0 to 10 and click Submit.
Another page appears, reporting whether your guess is correct or incorrect.
- If you guessed incorrectly, click the Back button to return to the main page.
You can continue to guess until you get the correct answer.
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