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Tehnologii de Programare in Internet(TPI / RST)
Titulari curs: Mihnea Magheti, Eduard-Cristian PopoviciSuport curs: http://discipline.elcom.pub.ro/tpi/ Moodle: http://electronica07.curs.ncit.pub.ro/course/category.php?id=3
UPB – Facultatea ETTI – Curs TPI – an III – RST
2009 - 2010
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Obiectivele disciplinei
UPB – Facultatea ETTI – Curs TPI – an III – RST
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Obiective curs:Prezentarea unor tehnologii de programare larg utilizate in Internet:
- Desktop (comunicatii la nivel socket TCP si UDP),
- Web (tehnologii pentru client si server HTTP),
- Acces la Baze de Date, Servicii Web, etc.;
folosind diferite limbaje de programare: HTML, Java, XML, SQL, etc.
Obiective aplicaţii:
Crearea abilităţilor de a aplica cunoştinţele generale privind tehnologiilede programare predate, in cadrul mai multor categorii de mini-proiecte.
Posibilitatea de a alege si concepe arhitectura si componentele software necesare, si de a realiza programe concrete care sa raspunda cerintelorformulate.
Obiectivele disciplinei
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Structura cursului
UPB – Facultatea ETTI – Curs TPI – an III – RST
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Structura cursului
1. Introducere in tehnologiile Internet
2. Introducere in tehnologiile desktop (SE) Java2.1. Elemente de baza. Tipuri de date referinta. Clase de biblioteca2.2. Clase pentru fluxuri de intrare-iesire (IO)
3. Programarea la nivel socket in Java3.1. Introducere in Protocolul Internet (IP) si stiva de protocoale IP3.2. Socketuri flux (TCP) Java si programe multifilare (threads)3.3. Socketuri datagrama (UDP) Java
4. Tehnologii Java de programare a aplicatiilor Web (EE) Java4.1. Tehnologii client. Miniaplicatii Java (applet-uri)4.2. Clase pentru interfete grafice cu utilizatorul (AWT, Swing)4.3. Platforma Java EE. Arhitectura si tehnologiile implicate4.4. Tehnologii server. Tehnologia Java Servlet4.5. Tehnologia Java ServerPages (JSP)4.6. Accesul la baze de date prin tehnologii Java (JDBC, Hibernate) 4.7. Tehnologii avansate (frameworks, componente EJB, Servicii Web)
Continut curs TPI
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Structura cursului
1. Introducere in tehnologiile Internet
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1. Introducere in TPITransmiterea mesajelor in reteaua locala si in Internet (reteaua de retele globala)
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1. Introducere in TPIComunicatia prin comutatie de pachete (IP) vs comutatie de circuite
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1. Introducere in TPIComunicatia prin comutatie de pachete (Internet Protocol) vs comutatie de circuite (canal dedicat, de ex. telefonie clasica)
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Modelul comunicatiilor in InternetRutarea mesajelor in Internet (la nivel IP – Internet Protocol)
1. Introducere in TPI
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1. Introducere in TPIComunicatie prin mesaje non-fiabila (fara confirmare sauretransmisie) ca in
- IP (Internet Protocol) si
- UDP (User Datagram Protocol)
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Comunicatie prin mesaje fiabila (confirmare+retransmisie)
- ca in TCP
1. Introducere in TPI
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1. Introducere in TPIComunicatia orientata spre conexiune (flux) TCP prin comutatiede pachete IP
Comunicatia fara conexiune prin datagrame (pachete) UDP (incapsulate in datagrame IP)
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1. Introducere in TPIComunicatia TCP orientata spre conexiune, fiabila, prin comutatiede pachete IP versus comunicatia UDP fara conexiune, non-fiabila, prin datagrame (incapsulate in datagrame IP)
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1. Introducere in TPIModele de comunicatie stratificataExemplul unui dialog la distanta intre interlocutori de limbi diferite
1. Nivelul cel mai inalt (abstract)
2. Detaliind utilizarea unor traducatori (nivel intermediar)
Vorbitor de limba A
Vorbitor de limba B
Mediu de comunicatie
Dialog (nivel logic) Protocol (set de reguli)
specific dialogului
Comunicatie propriu-zisa (nivel “fizic”)
Vorbitor de limba A
Vorbitor de limba B
Traducator Traducator
Mediu de comunicatie
Dialog virtual Protocol (set de reguli)
specific dialogului
Protocol (set de reguli) specific traducerilor
Dialog (nivel logic)
Comunicatie propriu-zisa (nivel “fizic”)
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1. Introducere in TPIModele de comunicatie stratificataExemplul unui dialog la distanta intre interlocutori de limbi diferite
3. Detaliind utilizarea unui suport tehnic local si a unui sistem de comunicatie propriu-zis
Vorbitor de limba A
Vorbitor de limba B
Traducator Traducator
Suport tehnic transfer
Suport tehnic transfer
Sistem de comunicatie (incluzand protocoale specifice comunicatiei)
Protocol (set de reguli) specific dialogului
Protocol (set de reguli) specific traducerilor
Protocol (set de reguli) specific transferului
Dialog virtual
Dialog (nivel logic)
Comunicatie propriu-zisa (nivel “fizic”)
Dialog (nivel logic)
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1. Introducere in TPIModele de comunicatie stratificataProtocolul de comunicatie este un
- set de reguli si conventii care au fost convenite intre participantii la o comunicatie pentru a asigura buna desfasurare a dialogului- bazat pe mesaje / pachete / cadre / etc. (unitati de date) schimbate si pe primitive / automate / etc. (elemente de comportament)
Interactiunile pe orizontala se desfasoara- conform protocolului de la respectivul nivel, care consta in interactiuni virtuale, realizate prin interactiuni la nivelurile inferioare
Interactiunile pe verticala- transmit si preiau sarcini si unitati de date cu scopul transferului unitatilor de date catre / de la partenerul de la acelasi nivel
Serviciul este un- set de functii posibil de oferit de catre nivelul inferior, respectiv - setul de sarcini posibil de solicitat de catre nivelul superior, in interactiunile pe verticala
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Impachetareaoctetilor din fluxul de date ai Aplicatiei in segmenteTCP
Incapsulareasegmentelorin DatagrameIP
TransmisiaDatagramelorIP prinInternet
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1. Introducere in TPIModelul comunicatiilor in InternetFluxurile de date, conexiunile logice si stivele de protocoale de comunicatie
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1. Introducere in TPIModelulcomunicatiilorin InternetStiva de protocoale de comunicatieTCP/IP
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1. Introducere in TPIModelulcomunicatiilorin InternetStiva de protocoale de comunicatieTCP/IP
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Modelulcomunicatiilorin InternetStiva de protocoale de comunicatieTCP/IP
vs
Stiva de referinta OSI a protocoalelor de comunicatie
si rolul fiecaruinivel in parte
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1. Introducere in TPIModelulcomunicatiilorin InternetStiva de protocoale de comunicatieTCP/IP
si modul in care se formeazapachetele de date din mesajeleaplicatiei la transmitator
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1. Introducere in TPIModelulcomunicatiilorin InternetStiva de protocoale de comunicatieTCP/IP
si modul in care se refacmesajeleaplicatiei dinpachetele de date la receptor
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1. Introducere in TPIModul in care aplicatiile folosesc protocoalele TCP si UDP
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1. Introducere in TPIUtilizarea adreselor IP pentru a identifica entitatile din InternetPorturile (80 al server-ului si 3022 al client-ului) permit identificareaproceselor / protocoalelor la nivel aplicatie
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1. Introducere in TPIStructura adreselor IP
- Network ID = componenta care identifica (sub)reteaua din Internet
- Host ID = componenta care identifica masina de calcul in (sub)retea
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1. Introducere in TPIModelul comunicatiilor in InternetClase de adrese numerice IP
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1. Introducere in TPIModelul comunicatiilor in InternetClase de adrese numerice IP
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1. Introducere in TPIModelul comunicatiilor in InternetUtilizarea serviciului DNS (Domain Name Server) pentru obtinereaadresei numerice IP echivalenta numelui masinii de calcul
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Modelulcomunicatiilorin InternetUtilizareaserviciului DNS
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1. Introducere in TPIModele de comunicatie prin mesaje- unicast (1 la 1)
- broadcast (difuzarecatre oricine)
- multicast (1 la N)
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1. Introducere in TPIModelul de comunicatie client-serverComunicatie prin mesaje cerere – raspuns (tranzactionala)
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1. Introducere in TPIModelul de comunicatie client-server (tranzactional)Client-server HTTP (HyperText Transport Protocol) peste TCP/IP
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1. Introducere in TPIComponentele functionale majore ale WWW (World Wide Web)
“Adresa” HTTP = URL (Uniform Resource Locator)
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1. Introducere in TPIModelul client-server Web (cerere-raspuns HTTP)1 – clientul furnizeaza adresa continutului HTML dorit, sub forma unei referinte URL (incapsulata intr-un mesaj HTTP request)
2 – serverul returneaza continutul HTML dorit (incapsulat intr-un mesaj HTTP response)
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1. Introducere in TPIModelul client-server Web (cerere-raspuns HTTP)1 – clientul furnizeaza adresa continutului HTML dorit
2 – serverul returneaza continutul HTML dorit
Continutul HTTP este transformat(interpretat) la afisarea pe ecran
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1. Introducere in TPI
Continutul HTTP il duce pe user la alte continuturi HTTP (prin asta se creeaza panza hypertext – web-ul)
Modelul client-server Web (cerere-raspuns HTTP)1 – clientul furnizeaza adresa continutului HTML dorit
2 – serverul returneaza continutul HTML dorit
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1. Introducere in TPIModelul client-server Web (cerere-raspuns HTTP)Hypertext vs text liniar
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1. Introducere in TPIModelul client-server Web (cerere-raspuns HTTP)Hypertext vs text liniar
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1. Introducere in TPIModelul client-server Web (cerere-raspuns HTTP)Publicarea continutului HTML (1+2) si accesul la continut (3+4)
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1. Introducere in TPIModelul comunicatiilor in InternetFormatul pachetului IP (structura de biti)
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1. Introducere in TPIModelul client-server Web (cerere-raspuns HTTP)Formatul cererii HTTP
(text)
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1. Introducere in TPIModelul client-server Web (cerere-raspuns HTTP)Formatul raspunsului HTTP
(text)
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1. Introducere in TPIModelul client-server Web (cerere-raspuns HTTP)Pasii detaliati ai obtinerii continutului HTML
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1. Introducere in TPIModelul client-server cu tehnologii Java
Sistemul client poate contine aplicatii de sine statatoare (Java SE) saubrowsere si continut Web (incluzand applet-uri), si optional JavaBeans
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1. Introducere in TPIModelul client-server cu tehnologii Java
Subsistemul Web al serverului contine componente Web (Java EE): servlet-uri Java si JSP (Java ServerPages), si optional JavaBeans
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1. Introducere in TPIModelul client-server cu tehnologii Java
Subsistemul business al serverului indeplineste sarcinile aplicatiei, poatefi distribuit, contine componentele business (EJB – Enterprise JavaBeans):
- bean-uri entitate (in EJB 2.x) sau entitati persistente (in EJB 3.0), - bean-uri sesiune si bean-uri pt. comunicatii asincrone (MDB)
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1. Introducere in TPIModelul client-server cu tehnologii Java
Subsistemul de integrare si management al datelor aplicatiei (EIS tier), contine elemente care furnizeaza/stocheaza datele aplicatiei (baze de date)
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1. Introducere in TPIModelul client-server cu tehnologii Java
Arhitectura Java EE se bazeaza pe mai multe containere (ofera servicii de nivel jos / suport specifice platformei) aflate pe serverul aplicatiei Web