Java Servlets Enter Java servlets. As was said
Java Servlets Enter Java servlets. As was said earlier, 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 servers, where they can take the place of CGI scripts. A servlet is similar to a proprietary server extension, except that it runs inside a Java Virtual Machine (JVM) on the server (see Figure 1 4), so it is safe and portable. Servlets operate solely within the domain of the server: unlike applets, they do not require support for Java in the web browser. Figure 1-4. The servlet life cycle Unlike CGI and FastCGI, which use multiple processes to handle separate programs and/or separate requests, servlets are all handled by separate threads within the web server process. This means that servlets are also efficient and scalable. Because servlets run within the web server, they can interact very closely with the server to do things that are not possible with CGI scripts. Another advantage of servlets is that they are portable: both across operating systems as we are used to with Java and also across web servers. As you’ll see shortly, all of the major web servers support servlets. We believe that Java servlets offer the best possible platform for web application development, and we’ll have much more to say about this later in the chapter. Although servlets are most commonly used as a replacement for CGI scripts on a web server, they can extend any sort of server. Imagine, for example, a Java-based FTP server that handles each command with a separate servlet. New commands can be added by simply plugging in new servlets. Or, imagine a mail server that allows servlets to extend its functionality, perhaps by performing a virus scan on all attached documents or handling mail filtering tasks. this jsp blog emphasizes the use of servlets as a replacement for CGI programs. We believe that, at least in the near term, most servlet developers will design and deploy servlets for use with HTTP servers. In the long term, however, other uses are likely to catch on, so this jsp blog takes pains to point out what functionality is applicable to generic servlets and what applies only to HTTP servlets. Whatever you hope to do with servlets, this jsp blog can help you with your task. Support for Servlets
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