Java Servlet& Server side progaramming, Slides of Java Programming

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Disadvantages of CGI

There are many problems in CGI technology:

• If number of clients increases, it takes more time

for sending response.

• For each request, it starts a process and Web

server is limited to start processes.

• It uses platform dependent language e.g. C,

C++, perl.

Advantage of Servlet

• The web container creates threads for handling

the multiple requests to the servlet.

• Threads have a lot of benefits over the

Processes such as they share a common

memory area, lightweight, cost of

communication between the threads are low.

The basic benefits of servlet are as follows:

• Better performance: because it creates a thread for each request not process.
• Portability: because it uses java language.
• Robust: Servlets are managed by JVM so we don't need to worry about memory leak, garbage collection etc.
• Secure: because it uses java language

Benefits of servlet

• Portability
• Powerful
• Efficiency
• Safety
• Integration
• Extensibility
• Inexpensive
• Secure
• Performance

Anatomy of a Servlet

• init()

• destroy()

• service()

• doGet()
• doPost()

• Servlet API life cycle methods
  • init(): called when servlet is instantiated; must return before any other methods will be called
  • service(): method called directly by server when an HTTP request is received; default service() method calls doGet() (or related methods covered later)
  • destroy(): called when server shuts down