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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>

 <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>

 <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="../topics/cwlistbn.html" title="">Listeners</a></div>
 <div><a href="../topics/cwfiltbn.html" title="">Listeners</a></div>
 <div><a href="../topics/ccwtover.html" title="">Web application overview</a></div>
 </div>
 <div class="reltasks"><strong>Related tasks</strong><br />
 <div><a href="../topics/twsrvwiz.html">Creating Servlets</a></div>
 <div><a href="../topics/twlstwiz.html">Creating Listeners</a></div>
 <div><a href="../topics/twfltwiz.html">Creating Filters</a></div>
 </div>
 </div>

 </body>
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	<head>
	<meta content="text/html; charset=utf-8" http-equiv="Content-Type" />
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	<title>Servlets</title>
	</head>
	<body id="cwservbn"><a name="cwservbn"><!-- --></a>


	<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>

	<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>

	<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="../topics/cwlistbn.html" title="">Listeners</a></div>
	<div><a href="../topics/cwfiltbn.html" title="">Listeners</a></div>
	<div><a href="../topics/ccwtover.html" title="">Web application overview</a></div>
	</div>
	<div class="reltasks"><strong>Related tasks</strong><br />
	<div><a href="../topics/twsrvwiz.html">Creating Servlets</a></div>
	<div><a href="../topics/twlstwiz.html">Creating Listeners</a></div>
	<div><a href="../topics/twfltwiz.html">Creating Filters</a></div>
	</div>
	</div>

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