Servlet totorial

Servlet

Servlet




What are
Servlets?



Why are
Servlets?

Otoño -2010

When are
Servlets?
Why not
CGIs?

One example

2

What are Servlets?

3

Why are Servlets?

4

Where are Servlets?

5

When are Servlets?

When are
Servlets?

6

Why not CGIs?

7

How are Servlets?

8

One example

Who made
Servlets?
What are
Servlets?
Why areServlets?

Where are
Servlets?

How are
Servlets?

Who made Servlets?

Why not
CGIs?

Servlet

Who made
Servlets?

1

Ingeniería de Ejecución en computación e Informática
Departamento de ciencias de la computación y tecnologías de la información
Universidad del Bío-Bío

Where are
Servlets?

How are
Servlets?
One example

Who made servlets?

What are Servlets?Servlet

Servlet





Who made
Servlets?

Who made
Servlets?

What are
Servlets?

What are
Servlets?

Why are
Servlets?

Why are
Servlets?

Where are
Servlets?

Where are
Servlets?

When are
Servlets?

When are
Servlets?

Why not
CGIs?

Why not
CGIs?

How are
Servlets?

How are
Servlets?

One example

One example

1

Unidad de código Java que seejecuta en el lado del
servidor.

What are Servlets?

What are Servlets?

Servlet

Servlet





Who made
Servlets?
What are
Servlets?

1

2

Why are
Servlets?

Unidad de código Java que se ejecuta en el lado del
servidor.
Se ejecuta dentro de contenedores Web (Provee el
contexto).

Who made
Servlets?
What are
Servlets?
Why are
Servlets?

Where are
Servlets?Not necessarily over HTTP
But usually over HTTP (we'll focus here)

How are
Servlets?

One example

Unidad de código Java que se ejecuta en el lado del
servidor.
Se ejecuta dentro de contenedores Web (Provee el
contexto).
Ayuda con la comunicación cliente-servidor

Why not
CGIs?

How are
Servlets?

3

When are
Servlets?

Why not
CGIs?

2

Where are
Servlets?When are
Servlets?

1

One example

Why are Servlets?

1
2

Why are Servlets?

Servlet

Servlet





Who made
Servlets?

1

Permite paginas web con contenido dinámico.

Who made
Servlets?

What are
Servlets?

What are
Servlets?

Why are
Servlets?

Why are
Servlets?

Where are
Servlets?

Where are
Servlets?

When are
Servlets?

When are
Servlets?Why not
CGIs?

Why not
CGIs?

How are
Servlets?

How are
Servlets?

One example

One example

1
2

Permite paginas web con contenido dinámico.
Una fácil coordinación entre Servlets para hacer
aplicaciones web.

Why are Servlets?

Where are Servlets?

Servlet

Servlet





Who made
Servlets?

1
2

What are
Servlets?
Why are
Servlets?

3

Permitepaginas web con contenido dinámico.
Una fácil coordinación entre Servlets para hacer
aplicaciones web.
Soporta una gran cantidad de características.
1

Sessions, persistencia, administración de recursos (e.g.,
database connections), seguridad, etc.

WebServer

Who made
Servlets?


HTTP

What are
Servlets?
Browser

Why are
Servlets?
Where are
Servlets?

WebContainer

Whenare
Servlets?

When are
Servlets?

Controller

Why not
CGIs?

Why not
CGIs?

How are
Servlets?

How are
Servlets?

One example

One example

Where are
Servlets?

Where are Servlets?

View.jsp

Servlet





Receive Request for
Servlet S

Who made
Servlets?

Why are
Servlets?
Where are
Servlets?
When are
Servlets?
Why not
CGIs?
How are
Servlets?One example

Who made
Servlets?
Is S loaded?

What are
Servlets?

no

Why are
Servlets?

yes
Is S current?
yes
Forward Request
to S

Model

Why not CGI?

Servlet

What are
Servlets?

Data Base

no

(re)Load S

Where are
Servlets?
When are
Servlets?
Why not
CGIs?
How are
Servlets?
One example

1

CGI = Common Gateway Interface.

DAO

Why not...