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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 |
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| API</cite> and its associated classes and methods, as defined in the <cite>Sun |
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| Microsystems Java Servlet 2.3 Specification</cite>. These Java programs |
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| extend the functionality of a Web server by generating dynamic content and |
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| responding to Web client requests. When a browser sends a request to the server, |
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| the server can send the request information to a servlet, so that the servlet |
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| 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, |
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| servlets run on a Java-enabled Web server, such as the WebSphere<sup>®</sup> Application |
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| Server and extend the server's capabilities. Because of their flexibility |
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| and scalability, servlets are commonly used to enable businesses to connect |
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| databases to the Web.</p> |
| <div class="p">Although a servlet can be a completely self-contained program, you can |
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| split application development into two portions: <ul><li>The business logic (content generation), which governs the relationship |
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| between input, processing, and output</li> |
| <li>The presentation logic (content presentation, or graphic design rules), |
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| 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, |
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| the presentation logic handled by JavaServer Pages (JSP) or HTML files, and |
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| the HTTP protocol handled by a servlet. <div class="note"><span class="notetitle">Note: </span>JSP files can be used to manage |
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| both the presentation and business logic for a Web application. JSP files |
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| use structured markup for presentation, and supply servlet model behavior |
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| at run time.</div> |
| </div> |
| <p>You can develop, debug, and deploy servlets, set breakpoints within servlet objects, and step through |
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| code to make changes that are dynamically folded into the running servlet |
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| 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 |
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| 2.3 Specification</cite> at <samp class="codeph">java.sun.com/products/servlet/download.html</samp>.</p> |
| </div> |
| <div><p><b class="relconceptshd">Related concepts</b><br /> |
| <a href="ccwtover.html" title="">Web application overview</a><br /> |
| <a href="cwebdevelopmenttools.html" title="">Web development tools</a><br /> |
| </p> |
| <p><b class="reltaskshd">Related tasks</b><br /> |
| <a href="twsrvwiz.html">Creating Servlets</a><br /> |
| </p> |
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