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| <title>Servlets</title> |
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| <h1 class="topictitle1">Servlets</h1> |
| <div><p>Servlets are server-side Java™ programs that use the <cite>Sun Microsystems Java Servlet |
| API</cite> and its associated classes and methods, as defined in the <cite>Sun |
| Microsystems Java Servlet 2.3 Specification</cite>. These Java programs |
| extend the functionality of a Web server by generating dynamic content and |
| responding to Web client requests. When a browser sends a request to the server, |
| the server can send the request information to a servlet, so that the servlet |
| can construct the response that is sent back to the browser.</p> |
| <p>Just as applets run on a Web browser and extend the browser's capabilities, |
| servlets run on a Java-enabled Web server and extend |
| the server's capabilities. Because of their flexibility and scalability, servlets |
| are commonly used to enable businesses to connect databases to the Web.</p> |
| <div class="p">Although a servlet can be a completely self-contained program, you can |
| split application development into two portions: <ul><li>The business logic (content generation), which governs the relationship |
| between input, processing, and output</li> |
| <li>The presentation logic (content presentation, or graphic design rules), |
| which determines how information is presented to the user</li> |
| </ul> |
| Using this paradigm, you may choose to have business logic handled by Java beans, |
| the presentation logic handled by JavaServer Pages (JSP) or HTML files, and |
| the HTTP protocol handled by a servlet. <div class="note"><span class="notetitle">Note:</span> JSP files can be used to manage |
| both the presentation and business logic for a Web application. JSP files |
| use structured markup for presentation, and supply servlet model behavior |
| at run time.</div> |
| </div> |
| <p>You can develop, debug, and deploy servlets, set breakpoints within servlet |
| objects, and step through code to make changes that are dynamically folded |
| into the running servlet on a running server, without having to restart each |
| time.</p> |
| <p>For more information about servlets, refer to the <cite>Sun Microsystems Java Servlet |
| 2.3 Specification</cite> at <samp class="codeph">java.sun.com/products/servlet/download.html</samp>.</p> |
| </div> |
| <div><div class="relconcepts"><strong>Related concepts</strong><br> |
| <div><a href="ccwtover.html">Web application overview</a></div> |
| </div> |
| <div class="reltasks"><strong>Related tasks</strong><br> |
| <div><a href="twsrvwiz.html">Creating servlets</a></div> |
| </div> |
| </div> |
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