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Example text

Application logic keeps changing, clients need personalized views of information, and business partners need customized processing rules. We cannot write a single program that handles all these tasks. Furthermore, what if a new functionality has to be added? What if the data format changes? ) to add new code is surely the last thing we want to do. Well, there is a better design for these kinds of servers: divide the code into two executable parts—one that handles the network and one that provides the application logic—and let the two executables have a standard interface between them.

A resource is passive when it does not have any processing of its own; active objects have their own processing capabilities. html file, a passive resource, and returns it to the browser. com forwards the request to reportServlet, an active resource. The servlet generates the HTML text on the fly and gives it to the web server. The web server, in turn, forwards it to the browser. A passive resource is also called a static resource, since its contents do not change with requests. A web application is usually a mixture of active and passive resources, but it is the presence of the active resources that make a web application nearly as interactive as normal applications.

We can develop and test a servlet in one container and deploy it in another. Unlike proprietary solutions, the Servlet API is independent of web servers and servlet containers. We can “write once, run anywhere,” as long as the containers support the standard Servlet API. One obvious limitation, or rather restriction, of the Servlet API is one that is common to all kinds of frameworks: you have to stick to the rules set forth by the framework. This means we have to follow certain conventions to make the servlet container happy.

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