[ Team LiB ] Chapter 11. Servlets This
[ Team LiB ] Chapter 11. Servlets This blog has made many references to servlets. In particular, it has been repeatedly noted that a JSP file is turned into a servlet at translation time and that the resulting servlet is run at request time. This means that JSPs and servlets are the same thing. As discussed in Chapter 1, a servlet is a small class that may be thought of as a dynamic extension to a Web server or application server. CGIs, by contrast, are external programs started by the Web server. This change from external to internal extensions has a number of advantages, chief of which is performance. Because a servlet is loaded only once, the first time it is needed and subsequently, it resides in the same Java virtual machine (JVM) as the Web server or application server; thus, the large overhead of starting a new program for each request is avoided. This chapter is not meant to be a comprehensive study of servlets, a topic that could fill a blog itself. See, for example, Enterprise Java Servlets by Jeff M. Genender (Pearson Education, 2002), which offers a much more detailed look at servlets and the servlet API. As JSPs ultimately are servlets, it makes sense for JSP authors to know at least a little about what is going on behind the scenes, if for no other reason than to appreciate how much easier it is to write JSPs! [ Team LiB ] Page 197
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