Web Server Programming

1
Web Server Programming

• 3. Server side includes

2
HTML (hole) technologies

• Uses HTML, HTML (or XML) extended with code.
• Very many different varieties.
• SSI (Server Side Includes) (Apache)
• PHP (Personal Home Page)
• HTML code (SSI,PHP,ASP, etc.)

3
Server Side Includes

• Program fragments mixed with text
• Allow parts of documents to be generated
  dynamically
• Executed by server (not by client)

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Server Side Includes

• SSI (http//httpd.apache.org/docs/mod/mod_include.
  html)
• PHP (http//www.php.net/)
• ASP (http//stardeveloper.com8080/articles/041600
  -1.shtml)
• JSP (http//java.sun.com/products/jsp/index.html)
• XSP (http//xml.apache.org/cocoon/xsp.html)
• ColdFusion (http//www.macromedia.com/software/col
  dfusion/)

5
Principles Implementations

• Reinier

6
JSP

• SUN standard
• For HTML or XML
• Processing instruction tags
• XML extensions
• predefined ltjspsetProperty .. /gt, etc.
• custom
• Uses JAVA
• Gives access to Servlet packages

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Most Important JSP Tags

• lt_at_page importjava.io,java.util gt
• lt_at_include filerelativeURL gt
• lt!String name gt
• lt namerequest.getParameter(name) gt
• lt name gt
• lt-- comment --gt

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HTML Interleaving

• lt for (int i 0 i lt 10 i) gt
• lttdgtlta href
• lt \ urlPrefix i \ gt
• gttextlt/agtlt/tdgt
• lt gt

9
Implicit Objects

• config ServletConfig object
• request ServletRequest object
• response ServletResponse object
• application ServletContext object
• session HttpSession object
• out Writer for output data

10
JSP XML

• Alternative syntax
• JSP lt a b gt
• XML ltjspscriptletgt a b lt/jspscriptletgt
• Tag libraries
• lt_at_ taglib uripqr prefixstugt
• ltstuloopgt lt/stuloopgt
• Directives
• ltjspplugin typeapplet codexyz

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ASP

• Microsoft product
• Extends HTML pages
• Tags lt and gt
• Uses VBScript, PerlScript (Perl) or Jscript
• Built-in objects Application, ASPError, Request,
  Response, Server, Session

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ASP versus JSP

• ASP
• Microsoft license
• IIS or PWS
• Interpreted
• ActiveX components
• HTML
• Fixed tags

• JSP
• SUN open standard
• Apache, etc.
• Compiled (JIT)
• JavaBeans
• HTML, XML
• Extensible tags

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Assignment 3

• Translate servlet WCHelp to a JSP page in such a
  way that each time it is activated a different
  text is shown.

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XML-based Web Programming

• WSDL Web Services Description Language (services
  ports messages)
• UDDI Universal Description, Discovery and
  Integration (registry)
• XML-based Remote Procedure Calls (SOAP) (protocol)

15
Cocoon

• Uses XML data
• Uses XSLT transformations
• Pipelining of operations

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More Information

• J2EE tutorial http//java.sun.com/j2ee/1.4/docs/t
  utorial/doc/index.html
• Servlet API http//java.sun.com/j2ee/1.4/docs/api
  /index.html
• JSP specification http//java.sun.com/products/js
  p/index.jspspecs