JSF - Prima applicazione

Per creare una semplice applicazione JSF, useremo il plugin maven-archetype-webapp. Nell'esempio seguente, creeremo un progetto di applicazione web basato su Maven nella cartella C: \ JSF.

Crea progetto

Apriamo la console di comando, vai su C:\ > JSF directory ed eseguire quanto segue mvn comando.

C:\JSF>mvn archetype:create  
-DgroupId = com.tutorialspoint.test  
-DartifactId = helloworld  
-DarchetypeArtifactId = maven-archetype-webapp

Maven inizierà l'elaborazione e creerà la struttura completa del progetto dell'applicazione web java.

[INFO] Scanning for projects... 
[INFO] Searching repository for plugin with prefix: 'archetype'. 
[INFO] ------------------------------------------------------------- 
[INFO] Building Maven Default Project 
[INFO]    task-segment: [archetype:create] (aggregator-style) 
[INFO] ------------------------------------------------------------- 
[INFO] [archetype:create {execution: default-cli}] 
[INFO] Defaulting package to group ID: com.tutorialspoint.test 
[INFO] artifact org.apache.maven.archetypes:maven-archetype-webapp:  
checking for updates from central 
[INFO] ------------------------------------------------------------- 
[INFO] Using following parameters for creating project  
from Old (1.x) Archetype: maven-archetype-webapp:RELEASE 
[INFO] ------------------------------------------------------------- 
[INFO] Parameter: groupId, Value: com.tutorialspoint.test 
[INFO] Parameter: packageName, Value: com.tutorialspoint.test 
[INFO] Parameter: package, Value: com.tutorialspoint.test 
[INFO] Parameter: artifactId, Value: helloworld 
[INFO] Parameter: basedir, Value: C:\JSF 
[INFO] Parameter: version, Value: 1.0-SNAPSHOT 
[INFO] project created from Old (1.x) Archetype in dir: 
C:\JSF\helloworld 
[INFO] ------------------------------------------------------------- 
[INFO] BUILD SUCCESSFUL 
[INFO] ------------------------------------------------------------- 
[INFO] Total time: 7 seconds 
[INFO] Finished at: Mon Nov 05 16:05:04 IST 2012 
[INFO] Final Memory: 12M/84M 
[INFO] -------------------------------------------------------------

Ora vai alla directory C: / JSF. Vedrai un progetto di applicazione web Java creato, denominato helloworld (come specificato in artifactId). Maven utilizza un layout di directory standard come mostrato nello screenshot seguente.

Utilizzando l'esempio precedente, possiamo comprendere i seguenti concetti chiave.

S.No	Struttura e descrizione delle cartelle
1	helloworld Contiene la cartella src e pom.xml
2	src/main/wepapp Contiene la cartella WEB-INF e la pagina index.jsp
3	src/main/resources Contiene file di immagini / proprietà (nell'esempio sopra, dobbiamo creare questa struttura manualmente)

Aggiungi funzionalità JSF al progetto

Aggiungi le seguenti dipendenze JSF.

<dependencies>
   <dependency>
      <groupId>com.sun.faces</groupId>
      <artifactId>jsf-api</artifactId>
      <version>2.1.7</version>
   </dependency>
	
   <dependency>
      <groupId>com.sun.faces</groupId>
      <artifactId>jsf-impl</artifactId>
      <version>2.1.7</version>
   </dependency>
	
</dependencies>

Completa POM.xml

<project xmlns = "http://maven.apache.org/POM/4.0.0" 
   xmlns:xsi = "http://www.w3.org/2001/XMLSchema-instance"
   xsi:schemaLocation = "http://maven.apache.org/POM/4.0.0
   http://maven.apache.org/maven-v4_0_0.xsd">
	
   <modelVersion>4.0.0</modelVersion>
   <groupId>com.tutorialspoint.test</groupId>
   <artifactId>helloworld</artifactId>
   <packaging>war</packaging>
   <version>1.0-SNAPSHOT</version>
   <name>helloworld Maven Webapp</name>
   <url>http://maven.apache.org</url>
	
   <dependencies>
      <dependency>
         <groupId>junit</groupId>
         <artifactId>junit</artifactId>
         <version>3.8.1</version>
         <scope>test</scope>
      </dependency>
		
      <dependency>
         <groupId>com.sun.faces</groupId>
         <artifactId>jsf-api</artifactId>
         <version>2.1.7</version>
      </dependency>
		
      <dependency>
         <groupId>com.sun.faces</groupId>
         <artifactId>jsf-impl</artifactId>
         <version>2.1.7</version>
      </dependency>
		
   </dependencies>
	
   <build>
      <finalName>helloworld</finalName>
      <plugins>
         <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-compiler-plugin</artifactId>
            <version>2.3.1</version>
				
            <configuration>
               <source>1.6</source>
               <target>1.6</target>
            </configuration>
         </plugin>
      </plugins>
   
   </build>		
</project>

Prepara il progetto Eclipse

Apriamo la console dei comandi. Vai alC:\ > JSF > helloworld directory ed eseguire quanto segue mvn comando.

C:\JSF\helloworld>mvn eclipse:eclipse -Dwtpversion = 2.0

Maven inizierà l'elaborazione, creerà il progetto pronto per eclipse e aggiungerà funzionalità wtp.

Downloading: http://repo.maven.apache.org/org/apache/maven/plugins/
maven-compiler-plugin/2.3.1/maven-compiler-plugin-2.3.1.pom
5K downloaded  (maven-compiler-plugin-2.3.1.pom)
Downloading: http://repo.maven.apache.org/org/apache/maven/plugins/
maven-compiler-plugin/2.3.1/maven-compiler-plugin-2.3.1.jar
29K downloaded  (maven-compiler-plugin-2.3.1.jar)
[INFO] Searching repository for plugin with prefix: 'eclipse'.
[INFO] ------------------------------------------------------------
[INFO] Building helloworld Maven Webapp
[INFO]    task-segment: [eclipse:eclipse]
[INFO] ------------------------------------------------------------
[INFO] Preparing eclipse:eclipse
[INFO] No goals needed for project - skipping
[INFO] [eclipse:eclipse {execution: default-cli}]
[INFO] Adding support for WTP version 2.0.
[INFO] Using Eclipse Workspace: null
[INFO] Adding default classpath container: org.eclipse.jdt.
launching.JRE_CONTAINER
Downloading: http://repo.maven.apache.org/
com/sun/faces/jsf-api/2.1.7/jsf-api-2.1.7.pom
12K downloaded  (jsf-api-2.1.7.pom)
Downloading: http://repo.maven.apache.org/
com/sun/faces/jsf-impl/2.1.7/jsf-impl-2.1.7.pom
10K downloaded  (jsf-impl-2.1.7.pom)
Downloading: http://repo.maven.apache.org/
com/sun/faces/jsf-api/2.1.7/jsf-api-2.1.7.jar
619K downloaded  (jsf-api-2.1.7.jar)
Downloading: http://repo.maven.apache.org/
com/sun/faces/jsf-impl/2.1.7/jsf-impl-2.1.7.jar
1916K downloaded  (jsf-impl-2.1.7.jar)
[INFO] Wrote settings to C:\JSF\helloworld\.settings\
org.eclipse.jdt.core.prefs
[INFO] Wrote Eclipse project for "helloworld" to C:\JSF\helloworld.
[INFO]
[INFO] -----------------------------------------------------------
[INFO] BUILD SUCCESSFUL
[INFO] -----------------------------------------------------------
[INFO] Total time: 6 minutes 7 seconds
[INFO] Finished at: Mon Nov 05 16:16:25 IST 2012
[INFO] Final Memory: 10M/89M
[INFO] -----------------------------------------------------------

Importa progetto in Eclipse

Di seguito sono riportati i passaggi:

Importa il progetto in eclipse utilizzando la procedura guidata di importazione.
Vai a File → Import... → Existing project into workspace.
Seleziona la directory principale in helloworld.
Mantenere Copy projects into workspace da controllare.
Fare clic sul pulsante Fine.
Eclipse importerà e copierà il progetto nel suo spazio di lavoro C:\ → Projects → Data → WorkSpace.

Configura Faces Servlet in web.xml

Individua web.xml in webapp → WEB-INF cartella e aggiornalo come mostrato di seguito.

<?xml version = "1.0" encoding = "UTF-8"?>
<web-app xmlns:xsi = "http://www.w3.org/2001/XMLSchema-instance"
   xmlns = "http://java.sun.com/xml/ns/javaee" 
   xmlns:web = "http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
   xsi:schemaLocation = "http://java.sun.com/xml/ns/javaee 
   http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
   id = "WebApp_ID" version="2.5">
	
   <welcome-file-list>
      <welcome-file>faces/home.xhtml</welcome-file>
   </welcome-file-list>
	
   <!-- 
      FacesServlet is main servlet responsible to handle all request. 
      It acts as central controller.
      This servlet initializes the JSF components before the JSP is displayed.
   -->
	
   <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>
	
   <servlet-mapping>
      <servlet-name>Faces Servlet</servlet-name>
      <url-pattern>*.jsf</url-pattern>
   </servlet-mapping>
	
   <servlet-mapping>
      <servlet-name>Faces Servlet</servlet-name>
      <url-pattern>*.faces</url-pattern>
   </servlet-mapping>
	
   <servlet-mapping>
      <servlet-name>Faces Servlet</servlet-name>
      <url-pattern>*.xhtml</url-pattern>
   </servlet-mapping>
	
</web-app>

Crea un bean gestito

Crea una struttura del pacchetto in src → main → java as com → tutorialspoint → test. Crea la classe HelloWorld.java in questo pacchetto. Aggiorna il codice diHelloWorld.java come mostrato di seguito.

package com.tutorialspoint.test;

import javax.faces.bean.ManagedBean;

@ManagedBean(name = "helloWorld", eager = true)
public class HelloWorld {
   
   public HelloWorld() {
      System.out.println("HelloWorld started!");
   }
	
   public String getMessage() {
      return "Hello World!";
   }
}

Crea una pagina JSF

Crea una pagina home.xhtml sotto webappcartella. Aggiorna il codice dihome.xhtml come mostrato di seguito.

<!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">
   <head>
      <title>JSF Tutorial!</title>
   </head>

   <body>
      #{helloWorld.getMessage()}
   </body>
</html>

Costruisci il progetto

Di seguito sono riportati i passaggi.

Seleziona il progetto helloworld in eclipse
Utilizzare la procedura guidata Esegui come
Selezionare Run As → Maven package
Maven inizierà a costruire il progetto e creerà helloworld.war sotto C:\ → Projects → Data → WorkSpace → helloworld → target cartella.

[INFO] Scanning for projects...
[INFO] -----------------------------------------------------
[INFO] Building helloworld Maven Webapp
[INFO] 
[INFO] Id: com.tutorialspoint.test:helloworld:war:1.0-SNAPSHOT
[INFO] task-segment: [package]
[INFO] -----------------------------------------------------
[INFO] [resources:resources]
[INFO] Using default encoding to copy filtered resources.
[INFO] [compiler:compile]
[INFO] Nothing to compile - all classes are up to date
[INFO] [resources:testResources]
[INFO] Using default encoding to copy filtered resources.
[INFO] [compiler:testCompile]
[INFO] No sources to compile
[INFO] [surefire:test]
[INFO] Surefire report directory: 
C:\Projects\Data\WorkSpace\helloworld\target\surefire-reports

-------------------------------------------------------
 T E S T S
-------------------------------------------------------
There are no tests to run.

Results :

Tests run: 0, Failures: 0, Errors: 0, Skipped: 0

[INFO] [war:war]
[INFO] Packaging webapp
[INFO] Assembling webapp[helloworld] in
[C:\Projects\Data\WorkSpace\helloworld\target\helloworld]
[INFO] Processing war project
[INFO] Webapp assembled in[150 msecs]
[INFO] Building war: 
C:\Projects\Data\WorkSpace\helloworld\target\helloworld.war
[INFO] ------------------------------------------------
[INFO] BUILD SUCCESSFUL
[INFO] ------------------------------------------------
[INFO] Total time: 3 seconds
[INFO] Finished at: Mon Nov 05 16:34:46 IST 2012
[INFO] Final Memory: 2M/15M
[INFO] ------------------------------------------------

Distribuisci file WAR