From: Subject: Java 2 Entreprise Edition Date: Mon, 26 Aug 2002 00:38:44 +0200 MIME-Version: 1.0 Content-Type: multipart/related; boundary="----=_NextPart_000_0016_01C24C98.EEDBAFF0"; type="text/html" X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2600.0000 This is a multi-part message in MIME format. ------=_NextPart_000_0016_01C24C98.EEDBAFF0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Content-Location: http://perso.wanadoo.fr/jm.doudoux/java/tutorial/chap025.htm Java 2 Entreprise Edition
3D"Partie 3D"26. 3Dsommaire D=E9veloppons = en Java=20   

25. J2EE


3DChapitre=20 3D2=20 3D5=20

J2EE est l'acronyme de Java 2 Entreprise Edition. = Cette =E9dition=20 est d=E9di=E9e =E0 la r=E9alisation d'applications pour entreprises. = J2EE est bas=E9 sur=20 J2SE (Java 2 Standard Edition) qui contient les API de bases de java. =

J2EE est une plate-forme fortement orient=E9 serveur = pour le=20 d=E9veloppement et l'=E9x=E9cution d'applications distribu=E9es. Il est = compos=E9 de deux=20 parties essentielles :

Sun propose une impl=E9mentation minimale des = sp=E9cifications de=20 J2EE. Cette impl=E9mentation permet de d=E9velopper des applications = respectant les=20 sp=E9cifications mais n'est pas pr=E9vue pour =EAtre utilis=E9e dans un = environnement de=20 production. Ces sp=E9cifications doivent =EAtre respect=E9es par les = outils d=E9velopp=E9s=20 par des =E9diteurs tiers.

 

3D"en
Ce chapitre est en cours=20 d'=E9criture

 

25.1. Les API de J2EE

J2EE regroupe un ensemble d'API pour le = d=E9veloppement=20 d'applications d'entreprise.

API R=F4le
version de l'API dans J2EE 1.2
version de l'API dans J2EE 1.3
Entreprise java bean (EJB) Composants serveurs contenant la logique m=E9tier
1.1
2.0
Remote M=E9thod Invocation (RMI) et RMI-IIOP RMI permet d'utilisation d'objet java distribu=E9. RMI-IIOP est = une=20 extension de RMI pour utiliser avec CORBA.
1.0
 
Java Naming and Directory Interface (JNDI) Acc=E8s aux services de nommage et aux annuaires = d'entreprises
1.2
1.2
Java Database Connectivity (JDBC) Acc=E8s aux bases de donn=E9es. J2EE int=E8gre une extension de = cette API
2.0
2.0
Java Transaction API (JTA)
Java Transaction Service = (JTS)		 Support des transactions
1.0
1.0
Java Messaging service (JMS) Support de messages via des MOM (Messages Oriented = Middleware)
1.0
1.0
Servlets Composants bas=E9 sur le concept C/S pour ajouter des = fonctionnalit=E9s =E0=20 un serveur. Pour le moment, principalement utilis=E9 pour = =E9tendre un serveur=20 web
2.2
2.3
JSP  
1.1
1.2
Java IDL Utilisation de CORBA
 
 
JavaMail Envoie et r=E9ception d'email
1.1
1.2
J2EE Connector Architecture (JCA) Connecteurs pour acc=E9der =E0 des ressources de l'entreprises = tel que=20 CICS, TUXEDO, SAP ...
 
1.0
Java API for XML Parsing (JAXP) Analyse et exploitation de donn=E9es au format XML
 
1.1
Java Authentication and Authorization Service (JAAS) Echange s=E9curis=E9 de donn=E9es
 
1.0
JavaBeans Activation Framework Utilis=E9 par JavaMail : permet de d=E9terminer le type = mime
 
1.2

Ces API peuvent =EAtre regroup=E9es en trois grandes = cat=E9gories :=20

 

 

 

 

 

 

25.2. L'environnement d'=E9x=E9cution = des=20 applications J2EE

J2EE propose des sp=E9cifications pour une = infrastructure dans=20 laquelle s'=E9x=E9cute les composants. Ces sp=E9cifications d=E9crivent = les r=F4les de=20 chaque =E9l=E9ments et pr=E9cisent un ensemble d'interfaces pour = permettre =E0 chacun de=20 ces =E9l=E9ments de communiquer.

Ceci permet de s=E9parer les applications et = l'environnement dans=20 lequel il s'=E9x=E9cute. Les sp=E9cifications pr=E9cisent =E0 l'aide des = API un certain=20 nombre de fonctionnalit=E9s que doivent impl=E9menter l'environnement = d'ex=E9cution.=20 Ces fonctionnalit=E9s sont de bas niveau et permettent aux = d=E9veloppeurs de se=20 concentrer sur la logique m=E9tier.

Pour =E9xecuter ces composants de natures = diff=E9rentes, J2EE=20 d=E9finis des conteneurs pour chacun de ces composants. Il d=E9finit = pour chaque=20 composants des interfaces qui leur permettront de dialoguer avec les = composants=20 lors de leur execution. Les conteneurs permettent aux applications = d'acc=E9der aux=20 ressources et aux services en utilisant les API.

Les appels aux applications se font par des clients = via les=20 conteneurs. Les clients n'acc=E8dent pas directement aux applications = mais=20 sollicite le conteneur.

 

25.2.1. Les conteneurs

Les conteneurs assurent la gestion du cycle de vie = des=20 composants qui s'=E9x=E9cutent en eux.

Les conteneurs fournissent des services qui peuvent = =EAtre=20 utilis=E9s par les applications lors de leur =E9x=E9cution : .

Pour d=E9ployer une application dans un conteneur, il = faut lui=20 fournir deux =E9l=E9ments :

Il existe trois types d'archive :

Archive / module Contenu
Extension
Descripteur de d=E9ploiement
java Regroupe des classes
jar
application-client.jar
web Regroupe les servlets et les JSP ainsi que les ressources = necessaires=20 =E0 leur execution (classes, biblioth=E8que de balises, images, = ...)
war
web.xml
EJB Regroupe les EJB et leur composants (classes)
jar
ejb-jar.xml

Une application est un regroupement d'une ou plusieurs modules dans = un=20 fichier EAR (Entreprise ARchive). L'application est d=E9crite dans un = fichier=20 application.xml lui m=EAme contenu dans le fichier EAR

Il existe autant de conteneurs que de type d'applications :

 

25.2.2. Le conteneur web

 

L'impl=E9mentation de r=E9f=E9rence pour ce type de = conteneur est le=20 projet open source Tomcat du groupe Apache.

 

25.2.3. Le conteneur d'EJB

 

 

25.3. L'assemblage et le d=E9ploiement = d'applications J2EE

J2EE propose une sp=E9cification pour d=E9crire le = mode=20 d'assemblage et de d=E9ploiement d'une application J2EE.

Une application J2EE peut regrouper diff=E9rents = modules :=20 modules web, modules EJB ... Chacun de ces modules poss=E8de son propre = mode de=20 packaging. J2EE propose de regrouper ces diff=E9rents modules dans un = module=20 unique sous la forme d'un fichier EAR (Entreprise ARchive).

Le format de cet archive est tr=E8s semblable =E0 = celui des autres=20 archives :

Les serveurs d'application extraient chaque modules = du fichier=20 EAR et les d=E9ploient s=E9par=E9ment un par un.

 

 

25.3.1. Le contenu et l'organisation = d'un=20 fichier EAR

Le fichier EAR est compos=E9 au minimum :

Les modules ne doivent pas obligatoirement =EAtre = ins=E9r=E9s =E0 la=20 racine du fichier EAR : ils peuvent =EAtre mis dans des sous = r=E9pertoires pour=20 organiser le contenu de l'application. Il est par exemple pratique de = cr=E9er un=20 r=E9pertoire lib qui contient les fichier .jar des biblioth=E8ques = communes aux=20 diff=E9rents modules.

 

 

25.3.2. La cr=E9ation d'un fichier = EAR

Pour cr=E9er un fichier EAR, il est possible = d'utiliser un outils=20 graphique fourni par le vendeur du serveur d'application ou cr=E9er le = fichier=20 manuellement en suivant les =E9tapes suivantes :

  1. cr=E9er l'arboresence des r=E9pertoires qui vont contenir les = modules=20
  2. ins=E9rer dans cette arboresence les diff=E9rents modules =E0 = inclure dans le=20 fichier EAR=20
  3. cr=E9er le r=E9pertoire META-INF (en respectant la casse)=20
  4. cr=E9er le fichier application.xml dans ce r=E9pertoire=20
  5. utiliser l'outils jar pour cr=E9er le fichier le fichier EAR en = pr=E9cisant=20 les options cvf, le nom du fichier ear avec son extension et les = diff=E9rents=20 =E9l=E9ments qui compose le fichier (modules, r=E9pertoire dont le = r=E9pertoire=20 META-INF).

 

 

25.3.3. Les limitations des fichiers = EAR

Actullement les fichiers EAR ne servent =E0 regrouper = diff=E9rents=20 modules pour former une seule entit=E9. Rien n'est actuellement pr=E9vu = pour prendre=20 en compte la configuration des objets permettant l'acc=E8s aux = ressources par=20 l'application tel qu'une base de donn=E9es (JDBC pour DataSource, pool = de=20 connexion ...), un syst=E8me de message (JMS), etc ...

Pour lever une partie de ces limites, les serveurs=20 d'applications commerciaux proposent souvent des m=E9canismes = propri=E9taires=20 suppl=E9mentaires pour palier =E0 ces manques en attendant une = =E9volution des=20 sp=E9cifications.

 

3D"en
Ce chapitre est en cours=20 d'=E9criture

 


3D"Partie 3D"26. 3Dsommaire D=E9veloppons = en Java=20 =   
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