Server Side Programmin g I Servlet Funda

MODUL PERKULIAHAN

Server-Side
Programmin
gI
Servlet
Fundamenta
ls
Arsitektur E-Bisnis

Fakultas

Program Studi

Tatap eMuka

Ilmu Komputer

Sistem Informasi

04

Abstract

Kode MK

Disusun Oleh
Misbahul Fajri, ST., MTI

Kompetensi

Outline
 Common server-side programming techniques

Revisiting the Three-tier Model
Web-based e-commerce applications are usually built according to the “Three-tier Model” (Fig. 4.1),
which includes:
 The First-tier: Web Client
 Discussed in Chapter 3
 The Second-tier: Server-side Application (SSA)
 Discussed in this chapter

 The Third-tier: Database Management Systems (DBMS)
 Discussed in Chapter 5

Three-Tier Model (Fig. 4.1)

‘1
3

2

Arsitektur E-Bisnis
Misbahul Fajri, ST., MTI

Pusat Bahan Ajar dan eLearning
http://www.mercubuana.ac.id

First-tier : Web
Clients
Client Client Client
Brows Brows Brows

er
er
er

Third-tier
(DBMS) :
DB2
Database
data
S
Cluster(s) base
QL
Databa
s
Se
se
Other

Internet
Second-tier :

Server-side Web
Applications
Web
Server

Applica
tion
Server

Databa
se
Conne
ctivity

rvOracl
datab
er e
Clusterases
datab
ases

Server-side programming
technologies
There are numerous ways to implement server-side applications. Common examples include:
 CGI (Common Gateway Interface)
 ASP (Active Server Page)
 Java Servlets
 PHP, Perl, & other server programming languages

‘1
3

3

Arsitektur E-Bisnis
Misbahul Fajri, ST., MTI

Pusat Bahan Ajar dan eLearning
http://www.mercubuana.ac.id

Common Gateway Interface (CGI)
 Early Web page designs were “static” in the sense that a client can only request for a static
HTML document from the Web server (Fig. 4.2).
 Later, CGI programming techniques were introduced to remove this constraint by providing
dynamic Web pages via server-side interaction, as shown in Fig. 4.3.

Static Web Page Retrieval (Fig. 4.2)

 Request
for
Web
Document

 HTTP Request

 HTTP
Web Browser
Document

Web Server

 Retrieve
Document

CGI-based Web Application (Fig. 4.3)

‘1
3

4

Arsitektur E-Bisnis
Misbahul Fajri, ST., MTI

Pusat Bahan Ajar dan eLearning
http://www.mercubuana.ac.id

Web
Documents

 HTTP Request

Web
Browser

 HTTP
Document

Web Server
 Output
(HTML)

 HTML forms
to invoke CGI
scripts

CGI Scripts/
Applications

 Get Data

 Return data

Databas
e

Common Gateway Interface (CGI)
 Fig. 4.3 explains the retrieval of a static Web page. The Web browser goes to the designated
URL on a specific Web server to retrieve the required static HTML document when it receives
a client request.
 Note the content is independent of the request, in the sense, everyone who makes a request
to that particular URL gets the same document.

Active Server Page (ASP)

 ASP is a "scripting" technique that runs on Web servers rather than Web clients.This
contrasts with VBScript and JavaScript which run on web clients.
 It basically generates HTML documents for the Web client.
 Execution of the ASP code by the server returns the corresponding HTML document to the
client.
 Fig. 4.4 shows the schematic diagram of ASP model.

‘1
3

5

Arsitektur E-Bisnis
Misbahul Fajri, ST., MTI

Pusat Bahan Ajar dan eLearning
http://www.mercubuana.ac.id

ASP Model (Fig. 4.4)

ASP Engine
 HTTP Request

 HTTP Document
Web Browser
Web Server

Database

Disadvantages of CGI programs
 Each new request activates a new process to run the CGI program
 Creating a process requires time and resource so CGI programs is not as scaleable a solution
 Also, CGI programs may raise security problems

Java Servlet

 A servlet is a small piece of server-side application, which can be viewed as the server-side
analog of an applet.
 In a typical servlet application, a servlet-enabled Web server receives an HTTP request from
the client.

‘1
3

6

Arsitektur E-Bisnis
Misbahul Fajri, ST., MTI

Pusat Bahan Ajar dan eLearning
http://www.mercubuana.ac.id

 It then forwards the request to the servlet engine for performing the necessary operations as
specified by the program.
 Finally it returns a response (e.g., HTML document) to the client via the Web server (Fig. 4.5)

Typical Web-based Servlet Interaction (Fig. 4.5)

HTTP Request
Web
Browser

HTTP Response

Web Server

Servlet
Engine
Databa
se

Revisiting the Three-tier Model
Web-based e-commerce applications are usually built according to the “Three-tier Model” (Fig. 4.1),
which includes:
 The First-tier: Web Client
 Discussed in Chapter 3
 The Second-tier: Server-side Application (SSA)
 Discussed in this chapter
 The Third-tier: Database Management Systems (DBMS)
 Discussed in Chapter 5

‘1
3

7

Arsitektur E-Bisnis
Misbahul Fajri, ST., MTI

Pusat Bahan Ajar dan eLearning
http://www.mercubuana.ac.id

Three-Tier Model (Fig. 4.1)

First-tier : Web
Clients
Client Client Client
Brows Brows Brows
er
er
er

Third-tier
(DBMS) :
DB2
Database
data
S
Cluster(s)
base
QL
Databa
s
Se
se
Other

Internet
Second-tier :
Server-side Web
Applications
Web
Server

Applica
tion
Server

Databa
se
Conne
ctivity

rvOracl
datab
er e
Clusterases
datab
ases

Server-side programming
technologies
There are numerous ways to implement server-side applications. Common examples include:
 CGI (Common Gateway Interface)
 ASP (Active Server Page)
 Java Servlets
 PHP, Perl, & other server programming languages

‘1
3

8

Arsitektur E-Bisnis
Misbahul Fajri, ST., MTI

Pusat Bahan Ajar dan eLearning
http://www.mercubuana.ac.id

Common Gateway Interface (CGI)
 Early Web page designs were “static” in the sense that a client can only request for a static
HTML document from the Web server (Fig. 4.2).
 Later, CGI programming techniques were introduced to remove this constraint by providing
dynamic Web pages via server-side interaction, as shown in Fig. 4.3.

Static Web Page Retrieval (Fig. 4.2)

 Request
for
Web
Document

 HTTP Request

 HTTP
Web Browser
Document

Web Server

 Retrieve
Document

CGI-based Web Application (Fig. 4.3)

‘1
3

9

Arsitektur E-Bisnis
Misbahul Fajri, ST., MTI

Pusat Bahan Ajar dan eLearning
http://www.mercubuana.ac.id

Web
Documents

 HTTP Request

Web
Browser

 HTTP
Document

Web Server
 Output
(HTML)

 HTML forms
to invoke CGI
scripts

CGI Scripts/
Applications

 Get Data
 Return data

Databas
e

Common Gateway Interface (CGI)
 Fig. 4.3 explains the retrieval of a static Web page. The Web browser goes to the designated
URL on a specific Web server to retrieve the required static HTML document when it receives
a client request.
 Note the content is independent of the request, in the sense, everyone who makes a request
to that particular URL gets the same document.

Active Server Page (ASP)

 ASP is a "scripting" technique that runs on Web servers rather than Web clients.This
contrasts with VBScript and JavaScript which run on web clients.
 It basically generates HTML documents for the Web client.
 Execution of the ASP code by the server returns the corresponding HTML document to the
client.
 Fig. 4.4 shows the schematic diagram of ASP model.

‘1
3

10

Arsitektur E-Bisnis
Misbahul Fajri, ST., MTI

Pusat Bahan Ajar dan eLearning
http://www.mercubuana.ac.id

ASP Model (Fig. 4.4)

ASP Engine
 HTTP Request

 HTTP Document
Web Browser
Web Server
Database

Disadvantages of CGI programs
 Each new request activates a new process to run the CGI program
 Creating a process requires time and resource so CGI programs is not as scaleable a solution
 Also, CGI programs may raise security problems

Java Servlet

 A servlet is a small piece of server-side application, which can be viewed as the server-side
analog of an applet.
 In a typical servlet application, a servlet-enabled Web server receives an HTTP request from
the client.

‘1
3

11

Arsitektur E-Bisnis
Misbahul Fajri, ST., MTI

Pusat Bahan Ajar dan eLearning
http://www.mercubuana.ac.id

 It then forwards the request to the servlet engine for performing the necessary operations as
specified by the program.
 Finally it returns a response (e.g., HTML document) to the client via the Web server (Fig. 4.5)

Daftar Pustaka
•

‘1
3

E-Commerce Fundamental & Application, Wiley 2001

12

Arsitektur E-Bisnis
Misbahul Fajri, ST., MTI

Pusat Bahan Ajar dan eLearning
http://www.mercubuana.ac.id