JAVA SERVLET PROGRAMS

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Servlet Advantages and Disadvantages

Servlet Advantage 1.      Servlets provide a way to generate dynamic documents that is both easier to write and faster to run. 2.      provide all the powerfull features of JAVA, such as Exception handling and garbage collection. 3.      Servlet enables easy portability across Web Servers. 4.      Servlet can communicate with different servlet and servers. 5.      Since all web applications are stateless protocol, servlet uses its own API to maintain  session Servlet Disadvantage 1.      Designing in servlet is difficult and slows down the application. 2.      Writing complex business logic makes the application difficult to understand. 3.      You need a Java Runtime Environment on the server to run servlets. CGI is a completely language independent protocol, so you can write CGIs in whatever languages ...
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Servlet

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INTRODUCTION: Over the last few years, Java has become the predominant language for server-side programming. This is due in no small part to the Java Servlet API , which provides a standard way to extend web servers to support dynamic content generation. With the introduction of the J2EE specification for enterprise applications, servlets have taken over as the primary interface for thin-client applications. In terms of enterprise computing, servlets are a natural fit if you are using the Web as your deployment platform. You can take advantage of web browsers as universally available thin clients using the web server as middleware for running application logic. Under this model, the user makes a request of the web server, the server invokes a servlet designed to handle the request, the servlet fulfills the request, and the result is returned to the user for display in the web browser. While this sounds like every other dynamic content technology (such CGI, ISAP...
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The Deployment Descriptor: web.xml

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Before I explain what a deployment descriptor is, we should first understand the web application directory structure WEB APPLICATION DIRECTORY STRUCTURE: A Web application contains a structure hierarchy of directories and files in a standard layout. Such a hierarchy can be accessed in its "unpacked" form, where each directory and file exists in the filesystem separately(This  format is more useful during development) , or in its "packed" WAR file(This format is used  when you distribute your application to be installed) . Any Web Application that is to be deployed in Tomcat has to conform to this directory structure. The format of the structure can be seen in the figure below: Web Application Directory Structure Application Root Directory   - This is the root directory of the Web Application. The name of this directory is named by the developer - for example the default context we created for this module was called "stud...
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