转：Servlets vs CGI

Advantages of servlets over CGI processes

 

• have significantly less overhead
• can inherit processing state between invocations
• can use concurrency control in Java to share state at server

Servlets compared to CGI programs

 

• are slower only when being initially loaded
• are rather faster to run when loaded

Servlets can

 

• open a database connection when initially loaded

   

• share open DB connection with successive invocations

CGI programs have to renew DB connection each time they're run.

Servlets can

 

• store state information in static variables in servlet

   

• share access to state data each time servlet is run

   

• control concurrent access to shared state easily

CGI programs lack common address space to share state easily.

Disadvantages of servlets over CGI processes

 

• cruder model of concurrency (thread vs process scheduling)

   

• less robust - share common address space in JVM process

   

• more complex to write, handle and configure

地址：http://www.macs.hw.ac.uk/cs/online/3ni3/4/11.htm