Diffs

what is difference between servlet and cgi?

CGI :

1. Written in C, C++, Visual Basic and Perl
2. Difficult to maintain, non-scalable, non-manageable
3. Prone to security problems of programming language
4. Resource intensive and inefficient
5. Platform and application-specific
6. Every time a new process begins each time a request is made to CGI program.
7. A CGI program (and probably also an extensive runtime system or interpreter) needs  to be loaded and started for each CGI request.
8. CGI handles separate request by separate instances.

Servlet :

1. Written in Java
2. Powerful, reliable, and efficient
3. Improves scalability, reusability (component based)
4. Leverages built-in security of Java programming language
5. Platform independent and portable
6. A Servlet does not run in a separate process. This removes the overhead of creating a new process for each request.
7. A Servlet stays in memory between requests.
8. There is only a single instance which answers all requests concurrently. This saves memory and allows  a Servlet to easily manage persistent data.