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what are jsp, servlets and ejb's used for?

can some1 explain the above in nice simple english plz
no links
thanks in advance
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teachmejava
Asked:
teachmejava
3 Solutions
 
Mayank SAssociate Director - Product EngineeringCommented:
JSPs and servlets are meant developing web-applications using Java, which you can access from the network using a browser, like Experts-Exchange.com itself. A JSP is like an HTML page with Java code embedded in it, so the output can dynamically change (though it will run on the server side). A servlet is like a web-server side Java component which can be used for doing any kind of processing you want.... it needs a servlet container to run on the web-server (like Tomcat). A JSP is also compiled into a servlet.

An EJB is a remote Java component which executes some business-logic, takes care of transactions, etc. You can call it from remote Java clients which can be stand-alone applications, JSPs/ servlets, EJBs themselves, etc. You need an EJB container to run an EJB.... it also takes care of persistence of the bean objects, transactions of various users using the EJBs, etc. Very often, you prefer to have an application server which is bundled up with a web-server, servlet-container, EJB container....
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matthew016Commented:
With only HTML u can make static web pages : the user can only consult the page and interact with the links.
HTML can include scripts to have a dynamic website, like JavaScript :
but it is limited, can't hide source code, slow, ...
With JSP u can acces and update a DB, files, ...
It is similar to PHP and ASP technology.
JSP files contains HTML code and java code that u can include.
A JSP file is a way to write a servlet. It is actually compiled, before its first execution, into a servlet, so that the web server can understand the code.
The syntax of JSP files is especially convenient when u have less java code and more HTML code.
The servlet is especially convenient when u have a less HTML code and more Java code.
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ramsin112400Commented:
In addition to that If you want insert java code into HTML go for JSP which in turn compiles into a servlet. JSP's are meant for web application development.

On the other hand, servlets are used to enhance the server functionality, by creating a thread for each incoming request, so that the server can process many requests simultaneously.

EJB are nothing but java components (group of java classes), but when you deploy them in a application server, the container will provide some services like transactions, persistence, security etc releaving the burder of programmer.
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