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JSP: The Complete Reference
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CGI is convenient, but it has one big drawback Ordinarily, CGI spawns a new process for each HTTP request1 This isn t a problem when traffic is low, but it creates a great deal of overhead when the traffic level increases This being the case, CGI in general doesn t scale well A significant improvement came with the release in 1997 of the Java Servlet API, followed quickly by the JavaServer Pages (JSP) API These related technologies bring the full power of Java to the Web server, with database connectivity, network access, and multithreaded operations, and, notably, a different process model Servlets and
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Figure 2-3
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Dynamic applications using servlets, JSP, and J2EE
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Improvements on this exist, such as FastCGI, which handles all requests from a single persistent process
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Evolution of the Web Application
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THE WEB PROGRAMMING ENVIRONMENT
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JSP pages operate from a single instance that remains in memory and uses multiple threads to service requests simultaneously As Figure 2-3 shows, servlets and JSP pages can make use of the full Java 2 Enterprise Edition (J2EE) environment for sophisticated, robust applications
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The Shift from Client-Side to Server-Side Solutions
The Web application model has evolved as the Web has matured, and experience with each phase has driven requirements for the next The initial wave of client-side Java in the form of applets was phenomenally popular, but led to some disappointment as reality intruded Considerable incompatibilities occurred between browsers, lengthy downloads over slow modems, and security restrictions that limited applet usefulness Because of this, applet development slowed2, and server-side Java has been the biggest growth area Server-side Java has none of the restrictions of the applet environment No browser inconsistencies occur because the browser isn t required to host a Java virtual machine The browser only has to render HTML, which even the oldest browsers do reasonably well Also, no client-side setup is involved and no download of large class files Likewise, security considerations are limited to those already handled by the Web server, which is typically in a closed environment with controls in place JSP has proved to be a successful server-side technology and an excellent base for developing Web applications The remainder of this book explores JSP in-depth to demonstrate why this is so
2 Many observers believe client-side Java is poised for a comeback The Java plug-in eliminates browser inconsistencies and allows Swing components to be used Moreover, high-speed Internet connections are making download considerations increasingly unimportant
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Overview of the Hypertext Transfer Protocol (HTTP)
Copyright 2001 The McGraw-Hill Companies, Inc Click Here for Terms of Use
JSP: The Complete Reference
his chapter introduces the underlying language used by the Web client/server model In doing so, it develops the basic concepts critical to understanding the Web programming environment The chapter presents several examples of Web browsers and servers using this language to communicate Additional details about the protocol can be found in Appendix C
What Is HTTP
Whereas Hypertext Markup Language (HTML) is the language used to describe the insides of Web documents, Hypertext Transfer Protocol (HTTP) is the language used to describe how these documents are sent over the Internet The key to understanding Web programming is understanding this protocol and the environment in which it operates
A Language for Requesting Documents over the Internet
HTTP prescribes the rules by which browsers make requests and servers supply responses This set of rules, or protocol, includes ways to I Ask for a document by name I Agree on the data format I Determine who the user is I Decide how to handle outdated resources I Indicate the results of a request and other useful functions HTTP consists of a set of commands written as lines of ordinary ASCII text When you use a Web browser, you don t enter the HTTP commands directly Instead, when you type a URL or click a hyperlink, the browser translates your action into HTTP commands that request the document from the server specified in the URL The Web server finds the document and sends it back to the browser, where it s displayed, along with its associated graphics and other hyperlinks
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