JSP SERVLETS Programming Services java Web Services Developer WSDP Platform Enterprise Edition J2EE

JSP AND SERVLETS

Java Servlets are a key Component of Server side Java development.A servlet is a small, pluggable extension to a server that enhances the service functionality. Servlets allows Developers to extend and customize in java-enabled servers such as web server, a mail server, an application server or any Customer server with the hitherto unknown degree of portability, flexibility and ease.A Servlet is a generic server extension, a java class that can be loaded dynamically to expand the functionality of a server. Servlets are commonly used with web server, where they can replace CGI scripts. A servlet is similar to proprietary server extension, except that it runs inside a Java Virtual Machine (JVM) on the server. So it is safe and portable.Servlets operate solely with in the domain of the server unlike applets they don't require the support of java in web browser.Java servlets, as define by java Software divisions of Sun Microsystems (formally known as Java Soft), are the first Standard extensions to java. This means servlets are officially blessed by sun and are part of java language, but they are not part of core java API.

The Servlet has various advantageous features such as the following

Portable

Highly portable across Operating Systems and across Server Implementations because they interface to particular server architecture through a set of standard interface called Servlet Engine (i.e. platform independent).
Power

Servlets (server side java) can work with the full power of core API (J2SE) implementations such as Multithreading, N/W, RMI , Database Connectivity ,CORBA ,etc.
Efficient and Scalable

An intuitive Threading Model brings in the efficiency to handle each request using a New light weight thread a way which helps in handling multiple concurrent requests each by a separate thread so obtaining the scalability required.
Safe and Secure

It is safe due to Robustness which includes Exception Handling and Memory Management techniques (Garbage Collection) hence no memory leaks or memory management problems like dangling pointers, invalid pointer reference etc.
Flexibility

Any page can be included in to a static file by using either Server side Includes or Java Bean.
Integration

Servlets and tightly integrated with the servers hence can easily cooperate with the servers for performing various operations such as authorization check,translate file paths etc.

Servlet engine (Servlet Container)

Servlet interface to a particular server architecture through a set of standard interface called Servlet Engine(to run servlets we just can use any web server ,since servlets can be run using a standalone servlet engine the web server doesn't need to support servlet).There are three flavors of Servlet Engines, they are

Stand-Alone Servlet Engines

A stand-alone engine is the server that includes build-in support for servlets. Such an engine has the advantage that every thing works right out of the box. Some famous servers are Java Web server, Jigsaw server, Netscape Enterprise server, JSWDK (java server web development kit).

Add-on Servlet Engines

The Add-on servlet engine functions has plug-ins to the existing server, it adds servlet support to the server that was not originally designed keeping servlets in mind. Some famous servlets are Java Apache Server, Live Software's JRun server, and IBM Websphere.

Embeddable Servlet Engines

An embedded engine is generally a light weight server deployment platform that can be embedded in another application. Some of the famous webservers are Java server, Jef PosKanzer's Acme server, and Paralogic's webcore.

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